diff --git a/firebase-firestore/CHANGELOG.md b/firebase-firestore/CHANGELOG.md
index 66fce5b35ce..d2f756372e9 100644
--- a/firebase-firestore/CHANGELOG.md
+++ b/firebase-firestore/CHANGELOG.md
@@ -1,5 +1,5 @@
 # Unreleased
-
+* [feature] Pipelines
 
 # 25.1.2
 * [fixed] Fixed a server and sdk mismatch in unicode string sorting. [#6615](//github.com/firebase/firebase-android-sdk/pull/6615)
diff --git a/firebase-firestore/api.txt b/firebase-firestore/api.txt
index e3a55cf729c..cb86b4b0932 100644
--- a/firebase-firestore/api.txt
+++ b/firebase-firestore/api.txt
@@ -72,7 +72,7 @@ package com.google.firebase.firestore {
   @java.lang.annotation.Retention(java.lang.annotation.RetentionPolicy.RUNTIME) @java.lang.annotation.Target({java.lang.annotation.ElementType.FIELD, java.lang.annotation.ElementType.METHOD}) public @interface DocumentId {
   }
 
-  public class DocumentReference {
+  public final class DocumentReference {
     method public com.google.firebase.firestore.ListenerRegistration addSnapshotListener(android.app.Activity, com.google.firebase.firestore.EventListener<com.google.firebase.firestore.DocumentSnapshot!>);
     method public com.google.firebase.firestore.ListenerRegistration addSnapshotListener(android.app.Activity, com.google.firebase.firestore.MetadataChanges, com.google.firebase.firestore.EventListener<com.google.firebase.firestore.DocumentSnapshot!>);
     method public com.google.firebase.firestore.ListenerRegistration addSnapshotListener(com.google.firebase.firestore.EventListener<com.google.firebase.firestore.DocumentSnapshot!>);
@@ -85,6 +85,7 @@ package com.google.firebase.firestore {
     method public com.google.android.gms.tasks.Task<com.google.firebase.firestore.DocumentSnapshot!> get();
     method public com.google.android.gms.tasks.Task<com.google.firebase.firestore.DocumentSnapshot!> get(com.google.firebase.firestore.Source);
     method public com.google.firebase.firestore.FirebaseFirestore getFirestore();
+    method @RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public String getFullPath();
     method public String getId();
     method public com.google.firebase.firestore.CollectionReference getParent();
     method public String getPath();
@@ -143,6 +144,7 @@ package com.google.firebase.firestore {
 
   public final class FieldPath {
     method public static com.google.firebase.firestore.FieldPath documentId();
+    method @RestrictTo(androidx.annotation.RestrictTo.Scope.LIBRARY) public static com.google.firebase.firestore.FieldPath fromDotSeparatedPath(String);
     method public static com.google.firebase.firestore.FieldPath of(java.lang.String!...!);
   }
 
@@ -204,6 +206,7 @@ package com.google.firebase.firestore {
     method public com.google.firebase.firestore.LoadBundleTask loadBundle(byte[]);
     method public com.google.firebase.firestore.LoadBundleTask loadBundle(java.io.InputStream);
     method public com.google.firebase.firestore.LoadBundleTask loadBundle(java.nio.ByteBuffer);
+    method public com.google.firebase.firestore.PipelineSource pipeline();
     method public com.google.android.gms.tasks.Task<java.lang.Void!> runBatch(com.google.firebase.firestore.WriteBatch.Function);
     method public <TResult> com.google.android.gms.tasks.Task<TResult!> runTransaction(com.google.firebase.firestore.Transaction.Function<TResult!>);
     method public <TResult> com.google.android.gms.tasks.Task<TResult!> runTransaction(com.google.firebase.firestore.TransactionOptions, com.google.firebase.firestore.Transaction.Function<TResult!>);
@@ -416,6 +419,72 @@ package com.google.firebase.firestore {
     method public com.google.firebase.firestore.PersistentCacheSettings.Builder setSizeBytes(long);
   }
 
+  public final class Pipeline {
+    method public com.google.firebase.firestore.Pipeline addFields(com.google.firebase.firestore.pipeline.Selectable field, com.google.firebase.firestore.pipeline.Selectable... additionalFields);
+    method public com.google.firebase.firestore.Pipeline addStage(com.google.firebase.firestore.pipeline.Stage stage);
+    method public com.google.firebase.firestore.Pipeline aggregate(com.google.firebase.firestore.pipeline.AggregateStage aggregateStage);
+    method public com.google.firebase.firestore.Pipeline aggregate(com.google.firebase.firestore.pipeline.AggregateWithAlias accumulator, com.google.firebase.firestore.pipeline.AggregateWithAlias... additionalAccumulators);
+    method public com.google.firebase.firestore.Pipeline distinct(com.google.firebase.firestore.pipeline.Selectable group, java.lang.Object... additionalGroups);
+    method public com.google.firebase.firestore.Pipeline distinct(String groupField, java.lang.Object... additionalGroups);
+    method public com.google.android.gms.tasks.Task<com.google.firebase.firestore.PipelineSnapshot> execute();
+    method public com.google.android.gms.tasks.Task<com.google.firebase.firestore.PipelineSnapshot> execute(com.google.firebase.firestore.pipeline.PipelineOptions options);
+    method public com.google.firebase.firestore.Pipeline findNearest(com.google.firebase.firestore.pipeline.Field vectorField, com.google.firebase.firestore.VectorValue vectorValue, com.google.firebase.firestore.pipeline.FindNearestStage.DistanceMeasure distanceMeasure);
+    method public com.google.firebase.firestore.Pipeline findNearest(com.google.firebase.firestore.pipeline.Field vectorField, double[] vectorValue, com.google.firebase.firestore.pipeline.FindNearestStage.DistanceMeasure distanceMeasure);
+    method public com.google.firebase.firestore.Pipeline findNearest(com.google.firebase.firestore.pipeline.FindNearestStage stage);
+    method public com.google.firebase.firestore.Pipeline findNearest(String vectorField, com.google.firebase.firestore.VectorValue vectorValue, com.google.firebase.firestore.pipeline.FindNearestStage.DistanceMeasure distanceMeasure);
+    method public com.google.firebase.firestore.Pipeline findNearest(String vectorField, double[] vectorValue, com.google.firebase.firestore.pipeline.FindNearestStage.DistanceMeasure distanceMeasure);
+    method public com.google.firebase.firestore.Pipeline limit(int limit);
+    method public com.google.firebase.firestore.Pipeline offset(int offset);
+    method public com.google.firebase.firestore.Pipeline removeFields(com.google.firebase.firestore.pipeline.Field field, com.google.firebase.firestore.pipeline.Field... additionalFields);
+    method public com.google.firebase.firestore.Pipeline removeFields(String field, java.lang.String... additionalFields);
+    method public com.google.firebase.firestore.Pipeline replace(com.google.firebase.firestore.pipeline.Expr mapValue);
+    method public com.google.firebase.firestore.Pipeline replace(String field);
+    method public com.google.firebase.firestore.Pipeline sample(com.google.firebase.firestore.pipeline.SampleStage sample);
+    method public com.google.firebase.firestore.Pipeline sample(int documents);
+    method public com.google.firebase.firestore.Pipeline select(com.google.firebase.firestore.pipeline.Selectable selection, java.lang.Object... additionalSelections);
+    method public com.google.firebase.firestore.Pipeline select(String fieldName, java.lang.Object... additionalSelections);
+    method public com.google.firebase.firestore.Pipeline sort(com.google.firebase.firestore.pipeline.Ordering order, com.google.firebase.firestore.pipeline.Ordering... additionalOrders);
+    method public com.google.firebase.firestore.Pipeline union(com.google.firebase.firestore.Pipeline other);
+    method public com.google.firebase.firestore.Pipeline unnest(com.google.firebase.firestore.pipeline.Selectable arrayWithAlias);
+    method public com.google.firebase.firestore.Pipeline unnest(com.google.firebase.firestore.pipeline.UnnestStage unnestStage);
+    method public com.google.firebase.firestore.Pipeline unnest(String arrayField, String alias);
+    method public com.google.firebase.firestore.Pipeline where(com.google.firebase.firestore.pipeline.BooleanExpr condition);
+  }
+
+  public final class PipelineResult {
+    method public Object? get(com.google.firebase.firestore.FieldPath fieldPath);
+    method public Object? get(String field);
+    method public com.google.firebase.Timestamp? getCreateTime();
+    method public java.util.Map<java.lang.String,java.lang.Object?> getData();
+    method public String? getId();
+    method public com.google.firebase.firestore.DocumentReference? getRef();
+    method public com.google.firebase.Timestamp? getUpdateTime();
+    property public final com.google.firebase.Timestamp? createTime;
+    property public final com.google.firebase.firestore.DocumentReference? ref;
+    property public final com.google.firebase.Timestamp? updateTime;
+  }
+
+  public final class PipelineSnapshot implements java.lang.Iterable<com.google.firebase.firestore.PipelineResult> kotlin.jvm.internal.markers.KMappedMarker {
+    method public com.google.firebase.Timestamp getExecutionTime();
+    method public java.util.List<com.google.firebase.firestore.PipelineResult> getResults();
+    method public java.util.Iterator<com.google.firebase.firestore.PipelineResult> iterator();
+    property public final com.google.firebase.Timestamp executionTime;
+    property public final java.util.List<com.google.firebase.firestore.PipelineResult> results;
+  }
+
+  public final class PipelineSource {
+    method public com.google.firebase.firestore.Pipeline collection(com.google.firebase.firestore.CollectionReference ref);
+    method public com.google.firebase.firestore.Pipeline collection(com.google.firebase.firestore.pipeline.CollectionSource stage);
+    method public com.google.firebase.firestore.Pipeline collection(String path);
+    method public com.google.firebase.firestore.Pipeline collectionGroup(String collectionId);
+    method public com.google.firebase.firestore.Pipeline convertFrom(com.google.firebase.firestore.AggregateQuery aggregateQuery);
+    method public com.google.firebase.firestore.Pipeline convertFrom(com.google.firebase.firestore.Query query);
+    method public com.google.firebase.firestore.Pipeline database();
+    method public com.google.firebase.firestore.Pipeline documents(com.google.firebase.firestore.DocumentReference... documents);
+    method public com.google.firebase.firestore.Pipeline documents(java.lang.String... documents);
+    method public com.google.firebase.firestore.Pipeline pipeline(com.google.firebase.firestore.pipeline.CollectionGroupSource stage);
+  }
+
   @java.lang.annotation.Retention(java.lang.annotation.RetentionPolicy.RUNTIME) @java.lang.annotation.Target({java.lang.annotation.ElementType.METHOD, java.lang.annotation.ElementType.FIELD}) public @interface PropertyName {
     method public abstract String value();
   }
@@ -606,3 +675,954 @@ package com.google.firebase.firestore.ktx {
 
 }
 
+package com.google.firebase.firestore.pipeline {
+
+  public abstract class AbstractOptions<T extends com.google.firebase.firestore.pipeline.AbstractOptions<T>> {
+    method public final T with(String key, boolean value);
+    method public final T with(String key, com.google.firebase.firestore.pipeline.Field value);
+    method public final T with(String key, com.google.firebase.firestore.pipeline.GenericOptions value);
+    method protected final T with(String key, com.google.firebase.firestore.pipeline.InternalOptions value);
+    method public final T with(String key, double value);
+    method protected final T with(String key, error.NonExistentClass value);
+    method public final T with(String key, String value);
+    method public final T with(String key, long value);
+  }
+
+  public final class AggregateFunction {
+    method public com.google.firebase.firestore.pipeline.AggregateWithAlias alias(String alias);
+    method public static com.google.firebase.firestore.pipeline.AggregateFunction avg(com.google.firebase.firestore.pipeline.Expr expression);
+    method public static com.google.firebase.firestore.pipeline.AggregateFunction avg(String fieldName);
+    method public static com.google.firebase.firestore.pipeline.AggregateFunction count(com.google.firebase.firestore.pipeline.Expr expression);
+    method public static com.google.firebase.firestore.pipeline.AggregateFunction count(String fieldName);
+    method public static com.google.firebase.firestore.pipeline.AggregateFunction countAll();
+    method public static com.google.firebase.firestore.pipeline.AggregateFunction countIf(com.google.firebase.firestore.pipeline.BooleanExpr condition);
+    method public static com.google.firebase.firestore.pipeline.AggregateFunction generic(String name, com.google.firebase.firestore.pipeline.Expr... expr);
+    method public static com.google.firebase.firestore.pipeline.AggregateFunction maximum(com.google.firebase.firestore.pipeline.Expr expression);
+    method public static com.google.firebase.firestore.pipeline.AggregateFunction maximum(String fieldName);
+    method public static com.google.firebase.firestore.pipeline.AggregateFunction minimum(com.google.firebase.firestore.pipeline.Expr expression);
+    method public static com.google.firebase.firestore.pipeline.AggregateFunction minimum(String fieldName);
+    method public static com.google.firebase.firestore.pipeline.AggregateFunction sum(com.google.firebase.firestore.pipeline.Expr expression);
+    method public static com.google.firebase.firestore.pipeline.AggregateFunction sum(String fieldName);
+    field public static final com.google.firebase.firestore.pipeline.AggregateFunction.Companion Companion;
+  }
+
+  public static final class AggregateFunction.Companion {
+    method public com.google.firebase.firestore.pipeline.AggregateFunction avg(com.google.firebase.firestore.pipeline.Expr expression);
+    method public com.google.firebase.firestore.pipeline.AggregateFunction avg(String fieldName);
+    method public com.google.firebase.firestore.pipeline.AggregateFunction count(com.google.firebase.firestore.pipeline.Expr expression);
+    method public com.google.firebase.firestore.pipeline.AggregateFunction count(String fieldName);
+    method public com.google.firebase.firestore.pipeline.AggregateFunction countAll();
+    method public com.google.firebase.firestore.pipeline.AggregateFunction countIf(com.google.firebase.firestore.pipeline.BooleanExpr condition);
+    method public com.google.firebase.firestore.pipeline.AggregateFunction generic(String name, com.google.firebase.firestore.pipeline.Expr... expr);
+    method public com.google.firebase.firestore.pipeline.AggregateFunction maximum(com.google.firebase.firestore.pipeline.Expr expression);
+    method public com.google.firebase.firestore.pipeline.AggregateFunction maximum(String fieldName);
+    method public com.google.firebase.firestore.pipeline.AggregateFunction minimum(com.google.firebase.firestore.pipeline.Expr expression);
+    method public com.google.firebase.firestore.pipeline.AggregateFunction minimum(String fieldName);
+    method public com.google.firebase.firestore.pipeline.AggregateFunction sum(com.google.firebase.firestore.pipeline.Expr expression);
+    method public com.google.firebase.firestore.pipeline.AggregateFunction sum(String fieldName);
+  }
+
+  public final class AggregateStage extends com.google.firebase.firestore.pipeline.BaseStage<com.google.firebase.firestore.pipeline.AggregateStage> {
+    method public static com.google.firebase.firestore.pipeline.AggregateStage withAccumulators(com.google.firebase.firestore.pipeline.AggregateWithAlias accumulator, com.google.firebase.firestore.pipeline.AggregateWithAlias... additionalAccumulators);
+    method public com.google.firebase.firestore.pipeline.AggregateStage withGroups(com.google.firebase.firestore.pipeline.Selectable group, java.lang.Object... additionalGroups);
+    method public com.google.firebase.firestore.pipeline.AggregateStage withGroups(String groupField, java.lang.Object... additionalGroups);
+    field public static final com.google.firebase.firestore.pipeline.AggregateStage.Companion Companion;
+  }
+
+  public static final class AggregateStage.Companion {
+    method public com.google.firebase.firestore.pipeline.AggregateStage withAccumulators(com.google.firebase.firestore.pipeline.AggregateWithAlias accumulator, com.google.firebase.firestore.pipeline.AggregateWithAlias... additionalAccumulators);
+  }
+
+  public final class AggregateWithAlias {
+  }
+
+  public abstract class BaseStage<T extends com.google.firebase.firestore.pipeline.BaseStage<T>> {
+    method protected final String getName();
+    method public final T with(String key, boolean value);
+    method public final T with(String key, com.google.firebase.firestore.pipeline.Field value);
+    method public final T with(String key, double value);
+    method protected final T with(String key, error.NonExistentClass value);
+    method public final T with(String key, String value);
+    method public final T with(String key, long value);
+    property protected final String name;
+  }
+
+  public class BooleanExpr extends com.google.firebase.firestore.pipeline.FunctionExpr {
+    method public final com.google.firebase.firestore.pipeline.Expr cond(com.google.firebase.firestore.pipeline.Expr thenExpr, com.google.firebase.firestore.pipeline.Expr elseExpr);
+    method public final com.google.firebase.firestore.pipeline.Expr cond(Object thenValue, Object elseValue);
+    method public final com.google.firebase.firestore.pipeline.AggregateFunction countIf();
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr generic(String name, com.google.firebase.firestore.pipeline.Expr... expr);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr not();
+    field public static final com.google.firebase.firestore.pipeline.BooleanExpr.Companion Companion;
+  }
+
+  public static final class BooleanExpr.Companion {
+    method public com.google.firebase.firestore.pipeline.BooleanExpr generic(String name, com.google.firebase.firestore.pipeline.Expr... expr);
+  }
+
+  public final class CollectionGroupSource extends com.google.firebase.firestore.pipeline.BaseStage<com.google.firebase.firestore.pipeline.CollectionGroupSource> {
+    method public static com.google.firebase.firestore.pipeline.CollectionGroupSource of(String collectionId);
+    method public error.NonExistentClass withForceIndex(String value);
+    field public static final com.google.firebase.firestore.pipeline.CollectionGroupSource.Companion Companion;
+  }
+
+  public static final class CollectionGroupSource.Companion {
+    method public com.google.firebase.firestore.pipeline.CollectionGroupSource of(String collectionId);
+  }
+
+  public final class CollectionSource extends com.google.firebase.firestore.pipeline.BaseStage<com.google.firebase.firestore.pipeline.CollectionSource> {
+    method public static com.google.firebase.firestore.pipeline.CollectionSource of(com.google.firebase.firestore.CollectionReference ref);
+    method public static com.google.firebase.firestore.pipeline.CollectionSource of(String path);
+    method public error.NonExistentClass withForceIndex(String value);
+    field public static final com.google.firebase.firestore.pipeline.CollectionSource.Companion Companion;
+  }
+
+  public static final class CollectionSource.Companion {
+    method public com.google.firebase.firestore.pipeline.CollectionSource of(com.google.firebase.firestore.CollectionReference ref);
+    method public com.google.firebase.firestore.pipeline.CollectionSource of(String path);
+  }
+
+  public final class ExplainOptions extends com.google.firebase.firestore.pipeline.AbstractOptions<com.google.firebase.firestore.pipeline.ExplainOptions> {
+    method public error.NonExistentClass withIndexRecommendation(boolean value);
+    method public error.NonExistentClass withMode(com.google.firebase.firestore.pipeline.ExplainOptions.ExplainMode value);
+    method public error.NonExistentClass withOutputFormat(com.google.firebase.firestore.pipeline.ExplainOptions.OutputFormat value);
+    method public error.NonExistentClass withProfiles(com.google.firebase.firestore.pipeline.ExplainOptions.Profiles value);
+    method public error.NonExistentClass withRedact(boolean value);
+    method public error.NonExistentClass withVerbosity(com.google.firebase.firestore.pipeline.ExplainOptions.Verbosity value);
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.Companion Companion;
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions DEFAULT;
+  }
+
+  public static final class ExplainOptions.Companion {
+  }
+
+  public static final class ExplainOptions.ExplainMode {
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.ExplainMode ANALYZE;
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.ExplainMode.Companion Companion;
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.ExplainMode EXECUTE;
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.ExplainMode EXPLAIN;
+  }
+
+  public static final class ExplainOptions.ExplainMode.Companion {
+  }
+
+  public static final class ExplainOptions.OutputFormat {
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.OutputFormat.Companion Companion;
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.OutputFormat JSON;
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.OutputFormat STRUCT;
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.OutputFormat TEXT;
+  }
+
+  public static final class ExplainOptions.OutputFormat.Companion {
+  }
+
+  public static final class ExplainOptions.Profiles {
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.Profiles BYTES_THROUGHPUT;
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.Profiles.Companion Companion;
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.Profiles LATENCY;
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.Profiles RECORDS_COUNT;
+  }
+
+  public static final class ExplainOptions.Profiles.Companion {
+  }
+
+  public static final class ExplainOptions.Verbosity {
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.Verbosity.Companion Companion;
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.Verbosity EXECUTION_TREE;
+    field public static final com.google.firebase.firestore.pipeline.ExplainOptions.Verbosity SUMMARY_ONLY;
+  }
+
+  public static final class ExplainOptions.Verbosity.Companion {
+  }
+
+  public abstract class Expr {
+    method public final com.google.firebase.firestore.pipeline.Expr add(com.google.firebase.firestore.pipeline.Expr second);
+    method public static final com.google.firebase.firestore.pipeline.Expr add(com.google.firebase.firestore.pipeline.Expr first, com.google.firebase.firestore.pipeline.Expr second);
+    method public static final com.google.firebase.firestore.pipeline.Expr add(com.google.firebase.firestore.pipeline.Expr first, Number second);
+    method public final com.google.firebase.firestore.pipeline.Expr add(Number second);
+    method public static final com.google.firebase.firestore.pipeline.Expr add(String numericFieldName, com.google.firebase.firestore.pipeline.Expr second);
+    method public static final com.google.firebase.firestore.pipeline.Expr add(String numericFieldName, Number second);
+    method public com.google.firebase.firestore.pipeline.ExprWithAlias alias(String alias);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr and(com.google.firebase.firestore.pipeline.BooleanExpr condition, com.google.firebase.firestore.pipeline.BooleanExpr... conditions);
+    method public static final com.google.firebase.firestore.pipeline.Expr arrayConcat(com.google.firebase.firestore.pipeline.Expr firstArray, com.google.firebase.firestore.pipeline.Expr secondArray, java.lang.Object... otherArrays);
+    method public static final com.google.firebase.firestore.pipeline.Expr arrayConcat(com.google.firebase.firestore.pipeline.Expr firstArray, Object secondArray, java.lang.Object... otherArrays);
+    method public final com.google.firebase.firestore.pipeline.Expr arrayConcat(com.google.firebase.firestore.pipeline.Expr secondArray, java.lang.Object... otherArrays);
+    method public final com.google.firebase.firestore.pipeline.Expr arrayConcat(Object secondArray, java.lang.Object... otherArrays);
+    method public static final com.google.firebase.firestore.pipeline.Expr arrayConcat(String firstArrayField, com.google.firebase.firestore.pipeline.Expr secondArray, java.lang.Object... otherArrays);
+    method public static final com.google.firebase.firestore.pipeline.Expr arrayConcat(String firstArrayField, Object secondArray, java.lang.Object... otherArrays);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr arrayContains(com.google.firebase.firestore.pipeline.Expr element);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr arrayContains(com.google.firebase.firestore.pipeline.Expr array, com.google.firebase.firestore.pipeline.Expr element);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr arrayContains(com.google.firebase.firestore.pipeline.Expr array, Object element);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr arrayContains(Object element);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr arrayContains(String arrayFieldName, com.google.firebase.firestore.pipeline.Expr element);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr arrayContains(String arrayFieldName, Object element);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAll(com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAll(com.google.firebase.firestore.pipeline.Expr array, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAll(com.google.firebase.firestore.pipeline.Expr array, java.util.List<?> values);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAll(String arrayFieldName, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAll(String arrayFieldName, java.util.List<?> values);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAll(java.util.List<?> values);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAny(com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAny(com.google.firebase.firestore.pipeline.Expr array, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAny(com.google.firebase.firestore.pipeline.Expr array, java.util.List<?> values);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAny(String arrayFieldName, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAny(String arrayFieldName, java.util.List<?> values);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAny(java.util.List<?> values);
+    method public final com.google.firebase.firestore.pipeline.Expr arrayLength();
+    method public static final com.google.firebase.firestore.pipeline.Expr arrayLength(com.google.firebase.firestore.pipeline.Expr array);
+    method public static final com.google.firebase.firestore.pipeline.Expr arrayLength(String arrayFieldName);
+    method public final com.google.firebase.firestore.pipeline.Expr arrayOffset(com.google.firebase.firestore.pipeline.Expr offset);
+    method public static final com.google.firebase.firestore.pipeline.Expr arrayOffset(com.google.firebase.firestore.pipeline.Expr array, com.google.firebase.firestore.pipeline.Expr offset);
+    method public static final com.google.firebase.firestore.pipeline.Expr arrayOffset(com.google.firebase.firestore.pipeline.Expr array, int offset);
+    method public final com.google.firebase.firestore.pipeline.Expr arrayOffset(int offset);
+    method public static final com.google.firebase.firestore.pipeline.Expr arrayOffset(String arrayFieldName, com.google.firebase.firestore.pipeline.Expr offset);
+    method public static final com.google.firebase.firestore.pipeline.Expr arrayOffset(String arrayFieldName, int offset);
+    method public final com.google.firebase.firestore.pipeline.Expr arrayReverse();
+    method public static final com.google.firebase.firestore.pipeline.Expr arrayReverse(com.google.firebase.firestore.pipeline.Expr array);
+    method public static final com.google.firebase.firestore.pipeline.Expr arrayReverse(String arrayFieldName);
+    method public final com.google.firebase.firestore.pipeline.Ordering ascending();
+    method public final com.google.firebase.firestore.pipeline.AggregateFunction avg();
+    method public final com.google.firebase.firestore.pipeline.Expr bitAnd(byte[] bitsOther);
+    method public final com.google.firebase.firestore.pipeline.Expr bitAnd(com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitAnd(com.google.firebase.firestore.pipeline.Expr bits, byte[] bitsOther);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitAnd(com.google.firebase.firestore.pipeline.Expr bits, com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitAnd(String bitsFieldName, byte[] bitsOther);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitAnd(String bitsFieldName, com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public final com.google.firebase.firestore.pipeline.Expr bitLeftShift(com.google.firebase.firestore.pipeline.Expr numberExpr);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitLeftShift(com.google.firebase.firestore.pipeline.Expr bits, com.google.firebase.firestore.pipeline.Expr numberExpr);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitLeftShift(com.google.firebase.firestore.pipeline.Expr bits, int number);
+    method public final com.google.firebase.firestore.pipeline.Expr bitLeftShift(int number);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitLeftShift(String bitsFieldName, com.google.firebase.firestore.pipeline.Expr numberExpr);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitLeftShift(String bitsFieldName, int number);
+    method public final com.google.firebase.firestore.pipeline.Expr bitNot();
+    method public static final com.google.firebase.firestore.pipeline.Expr bitNot(com.google.firebase.firestore.pipeline.Expr bits);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitNot(String bitsFieldName);
+    method public final com.google.firebase.firestore.pipeline.Expr bitOr(byte[] bitsOther);
+    method public final com.google.firebase.firestore.pipeline.Expr bitOr(com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitOr(com.google.firebase.firestore.pipeline.Expr bits, byte[] bitsOther);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitOr(com.google.firebase.firestore.pipeline.Expr bits, com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitOr(String bitsFieldName, byte[] bitsOther);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitOr(String bitsFieldName, com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public final com.google.firebase.firestore.pipeline.Expr bitRightShift(com.google.firebase.firestore.pipeline.Expr numberExpr);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitRightShift(com.google.firebase.firestore.pipeline.Expr bits, com.google.firebase.firestore.pipeline.Expr numberExpr);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitRightShift(com.google.firebase.firestore.pipeline.Expr bits, int number);
+    method public final com.google.firebase.firestore.pipeline.Expr bitRightShift(int number);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitRightShift(String bitsFieldName, com.google.firebase.firestore.pipeline.Expr numberExpr);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitRightShift(String bitsFieldName, int number);
+    method public final com.google.firebase.firestore.pipeline.Expr bitXor(byte[] bitsOther);
+    method public final com.google.firebase.firestore.pipeline.Expr bitXor(com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitXor(com.google.firebase.firestore.pipeline.Expr bits, byte[] bitsOther);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitXor(com.google.firebase.firestore.pipeline.Expr bits, com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitXor(String bitsFieldName, byte[] bitsOther);
+    method public static final com.google.firebase.firestore.pipeline.Expr bitXor(String bitsFieldName, com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public final com.google.firebase.firestore.pipeline.Expr byteLength();
+    method public static final com.google.firebase.firestore.pipeline.Expr byteLength(com.google.firebase.firestore.pipeline.Expr value);
+    method public static final com.google.firebase.firestore.pipeline.Expr byteLength(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.Expr ceil();
+    method public static final com.google.firebase.firestore.pipeline.Expr ceil(com.google.firebase.firestore.pipeline.Expr numericExpr);
+    method public static final com.google.firebase.firestore.pipeline.Expr ceil(String numericField);
+    method public final com.google.firebase.firestore.pipeline.Expr charLength();
+    method public static final com.google.firebase.firestore.pipeline.Expr charLength(com.google.firebase.firestore.pipeline.Expr expr);
+    method public static final com.google.firebase.firestore.pipeline.Expr charLength(String fieldName);
+    method public static final com.google.firebase.firestore.pipeline.Expr cond(com.google.firebase.firestore.pipeline.BooleanExpr condition, com.google.firebase.firestore.pipeline.Expr thenExpr, com.google.firebase.firestore.pipeline.Expr elseExpr);
+    method public static final com.google.firebase.firestore.pipeline.Expr cond(com.google.firebase.firestore.pipeline.BooleanExpr condition, Object thenValue, Object elseValue);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr constant(boolean value);
+    method public static final com.google.firebase.firestore.pipeline.Expr constant(byte[] value);
+    method public static final com.google.firebase.firestore.pipeline.Expr constant(com.google.firebase.firestore.Blob value);
+    method public static final com.google.firebase.firestore.pipeline.Expr constant(com.google.firebase.firestore.DocumentReference ref);
+    method public static final com.google.firebase.firestore.pipeline.Expr constant(com.google.firebase.firestore.GeoPoint value);
+    method public static final com.google.firebase.firestore.pipeline.Expr constant(com.google.firebase.firestore.VectorValue value);
+    method public static final com.google.firebase.firestore.pipeline.Expr constant(com.google.firebase.Timestamp value);
+    method public static final com.google.firebase.firestore.pipeline.Expr constant(Number value);
+    method public static final com.google.firebase.firestore.pipeline.Expr constant(String value);
+    method public static final com.google.firebase.firestore.pipeline.Expr constant(java.util.Date value);
+    method public final com.google.firebase.firestore.pipeline.Expr cosineDistance(com.google.firebase.firestore.pipeline.Expr vector);
+    method public static final com.google.firebase.firestore.pipeline.Expr cosineDistance(com.google.firebase.firestore.pipeline.Expr vector1, com.google.firebase.firestore.pipeline.Expr vector2);
+    method public static final com.google.firebase.firestore.pipeline.Expr cosineDistance(com.google.firebase.firestore.pipeline.Expr vector1, com.google.firebase.firestore.VectorValue vector2);
+    method public static final com.google.firebase.firestore.pipeline.Expr cosineDistance(com.google.firebase.firestore.pipeline.Expr vector1, double[] vector2);
+    method public final com.google.firebase.firestore.pipeline.Expr cosineDistance(com.google.firebase.firestore.VectorValue vector);
+    method public final com.google.firebase.firestore.pipeline.Expr cosineDistance(double[] vector);
+    method public static final com.google.firebase.firestore.pipeline.Expr cosineDistance(String vectorFieldName, com.google.firebase.firestore.pipeline.Expr vector);
+    method public static final com.google.firebase.firestore.pipeline.Expr cosineDistance(String vectorFieldName, com.google.firebase.firestore.VectorValue vector);
+    method public static final com.google.firebase.firestore.pipeline.Expr cosineDistance(String vectorFieldName, double[] vector);
+    method public final com.google.firebase.firestore.pipeline.AggregateFunction count();
+    method public final com.google.firebase.firestore.pipeline.Ordering descending();
+    method public final com.google.firebase.firestore.pipeline.Expr divide(com.google.firebase.firestore.pipeline.Expr divisor);
+    method public static final com.google.firebase.firestore.pipeline.Expr divide(com.google.firebase.firestore.pipeline.Expr dividend, com.google.firebase.firestore.pipeline.Expr divisor);
+    method public static final com.google.firebase.firestore.pipeline.Expr divide(com.google.firebase.firestore.pipeline.Expr dividend, Number divisor);
+    method public final com.google.firebase.firestore.pipeline.Expr divide(Number divisor);
+    method public static final com.google.firebase.firestore.pipeline.Expr divide(String dividendFieldName, com.google.firebase.firestore.pipeline.Expr divisor);
+    method public static final com.google.firebase.firestore.pipeline.Expr divide(String dividendFieldName, Number divisor);
+    method public final com.google.firebase.firestore.pipeline.Expr documentId();
+    method public static final com.google.firebase.firestore.pipeline.Expr documentId(com.google.firebase.firestore.DocumentReference docRef);
+    method public static final com.google.firebase.firestore.pipeline.Expr documentId(com.google.firebase.firestore.pipeline.Expr documentPath);
+    method public static final com.google.firebase.firestore.pipeline.Expr documentId(String documentPath);
+    method public final com.google.firebase.firestore.pipeline.Expr dotProduct(com.google.firebase.firestore.pipeline.Expr vector);
+    method public static final com.google.firebase.firestore.pipeline.Expr dotProduct(com.google.firebase.firestore.pipeline.Expr vector1, com.google.firebase.firestore.pipeline.Expr vector2);
+    method public static final com.google.firebase.firestore.pipeline.Expr dotProduct(com.google.firebase.firestore.pipeline.Expr vector1, com.google.firebase.firestore.VectorValue vector2);
+    method public static final com.google.firebase.firestore.pipeline.Expr dotProduct(com.google.firebase.firestore.pipeline.Expr vector1, double[] vector2);
+    method public final com.google.firebase.firestore.pipeline.Expr dotProduct(com.google.firebase.firestore.VectorValue vector);
+    method public final com.google.firebase.firestore.pipeline.Expr dotProduct(double[] vector);
+    method public static final com.google.firebase.firestore.pipeline.Expr dotProduct(String vectorFieldName, com.google.firebase.firestore.pipeline.Expr vector);
+    method public static final com.google.firebase.firestore.pipeline.Expr dotProduct(String vectorFieldName, com.google.firebase.firestore.VectorValue vector);
+    method public static final com.google.firebase.firestore.pipeline.Expr dotProduct(String vectorFieldName, double[] vector);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr endsWith(com.google.firebase.firestore.pipeline.Expr suffix);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr endsWith(com.google.firebase.firestore.pipeline.Expr stringExpr, com.google.firebase.firestore.pipeline.Expr suffix);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr endsWith(com.google.firebase.firestore.pipeline.Expr stringExpr, String suffix);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr endsWith(String suffix);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr endsWith(String fieldName, com.google.firebase.firestore.pipeline.Expr suffix);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr endsWith(String fieldName, String suffix);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr eq(com.google.firebase.firestore.pipeline.Expr other);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr eq(com.google.firebase.firestore.pipeline.Expr left, com.google.firebase.firestore.pipeline.Expr right);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr eq(com.google.firebase.firestore.pipeline.Expr left, Object right);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr eq(Object value);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr eq(String fieldName, com.google.firebase.firestore.pipeline.Expr expression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr eq(String fieldName, Object value);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr eqAny(com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr eqAny(com.google.firebase.firestore.pipeline.Expr expression, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr eqAny(com.google.firebase.firestore.pipeline.Expr expression, java.util.List<?> values);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr eqAny(String fieldName, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr eqAny(String fieldName, java.util.List<?> values);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr eqAny(java.util.List<?> values);
+    method public final com.google.firebase.firestore.pipeline.Expr euclideanDistance(com.google.firebase.firestore.pipeline.Expr vector);
+    method public static final com.google.firebase.firestore.pipeline.Expr euclideanDistance(com.google.firebase.firestore.pipeline.Expr vector1, com.google.firebase.firestore.pipeline.Expr vector2);
+    method public static final com.google.firebase.firestore.pipeline.Expr euclideanDistance(com.google.firebase.firestore.pipeline.Expr vector1, com.google.firebase.firestore.VectorValue vector2);
+    method public static final com.google.firebase.firestore.pipeline.Expr euclideanDistance(com.google.firebase.firestore.pipeline.Expr vector1, double[] vector2);
+    method public final com.google.firebase.firestore.pipeline.Expr euclideanDistance(com.google.firebase.firestore.VectorValue vector);
+    method public final com.google.firebase.firestore.pipeline.Expr euclideanDistance(double[] vector);
+    method public static final com.google.firebase.firestore.pipeline.Expr euclideanDistance(String vectorFieldName, com.google.firebase.firestore.pipeline.Expr vector);
+    method public static final com.google.firebase.firestore.pipeline.Expr euclideanDistance(String vectorFieldName, com.google.firebase.firestore.VectorValue vector);
+    method public static final com.google.firebase.firestore.pipeline.Expr euclideanDistance(String vectorFieldName, double[] vector);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr exists();
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr exists(com.google.firebase.firestore.pipeline.Expr value);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr exists(String fieldName);
+    method public static final com.google.firebase.firestore.pipeline.Field field(com.google.firebase.firestore.FieldPath fieldPath);
+    method public static final com.google.firebase.firestore.pipeline.Field field(String name);
+    method public final com.google.firebase.firestore.pipeline.Expr floor();
+    method public static final com.google.firebase.firestore.pipeline.Expr floor(com.google.firebase.firestore.pipeline.Expr numericExpr);
+    method public static final com.google.firebase.firestore.pipeline.Expr floor(String numericField);
+    method public static final com.google.firebase.firestore.pipeline.Expr generic(String name, com.google.firebase.firestore.pipeline.Expr... expr);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr gt(com.google.firebase.firestore.pipeline.Expr other);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr gt(com.google.firebase.firestore.pipeline.Expr left, com.google.firebase.firestore.pipeline.Expr right);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr gt(com.google.firebase.firestore.pipeline.Expr left, Object right);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr gt(Object value);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr gt(String fieldName, com.google.firebase.firestore.pipeline.Expr expression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr gt(String fieldName, Object value);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr gte(com.google.firebase.firestore.pipeline.Expr other);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr gte(com.google.firebase.firestore.pipeline.Expr left, com.google.firebase.firestore.pipeline.Expr right);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr gte(com.google.firebase.firestore.pipeline.Expr left, Object right);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr gte(Object value);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr gte(String fieldName, com.google.firebase.firestore.pipeline.Expr expression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr gte(String fieldName, Object value);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr ifError(com.google.firebase.firestore.pipeline.BooleanExpr tryExpr, com.google.firebase.firestore.pipeline.BooleanExpr catchExpr);
+    method public final com.google.firebase.firestore.pipeline.Expr ifError(com.google.firebase.firestore.pipeline.Expr catchExpr);
+    method public static final com.google.firebase.firestore.pipeline.Expr ifError(com.google.firebase.firestore.pipeline.Expr tryExpr, com.google.firebase.firestore.pipeline.Expr catchExpr);
+    method public static final com.google.firebase.firestore.pipeline.Expr ifError(com.google.firebase.firestore.pipeline.Expr tryExpr, Object catchValue);
+    method public final com.google.firebase.firestore.pipeline.Expr ifError(Object catchValue);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr isAbsent();
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr isAbsent(com.google.firebase.firestore.pipeline.Expr value);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr isAbsent(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr isNan();
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr isNan(com.google.firebase.firestore.pipeline.Expr expr);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr isNan(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr isNotNan();
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr isNotNan(com.google.firebase.firestore.pipeline.Expr expr);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr isNotNan(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr isNotNull();
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr isNotNull(com.google.firebase.firestore.pipeline.Expr expr);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr isNotNull(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr isNull();
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr isNull(com.google.firebase.firestore.pipeline.Expr expr);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr isNull(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr like(com.google.firebase.firestore.pipeline.Expr pattern);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr like(com.google.firebase.firestore.pipeline.Expr stringExpression, com.google.firebase.firestore.pipeline.Expr pattern);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr like(com.google.firebase.firestore.pipeline.Expr stringExpression, String pattern);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr like(String pattern);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr like(String fieldName, com.google.firebase.firestore.pipeline.Expr pattern);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr like(String fieldName, String pattern);
+    method public static final com.google.firebase.firestore.pipeline.Expr logicalMaximum(com.google.firebase.firestore.pipeline.Expr expr, java.lang.Object... others);
+    method public final com.google.firebase.firestore.pipeline.Expr logicalMaximum(com.google.firebase.firestore.pipeline.Expr... others);
+    method public final com.google.firebase.firestore.pipeline.Expr logicalMaximum(java.lang.Object... others);
+    method public static final com.google.firebase.firestore.pipeline.Expr logicalMaximum(String fieldName, java.lang.Object... others);
+    method public static final com.google.firebase.firestore.pipeline.Expr logicalMinimum(com.google.firebase.firestore.pipeline.Expr expr, java.lang.Object... others);
+    method public final com.google.firebase.firestore.pipeline.Expr logicalMinimum(com.google.firebase.firestore.pipeline.Expr... others);
+    method public final com.google.firebase.firestore.pipeline.Expr logicalMinimum(java.lang.Object... others);
+    method public static final com.google.firebase.firestore.pipeline.Expr logicalMinimum(String fieldName, java.lang.Object... others);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr lt(com.google.firebase.firestore.pipeline.Expr other);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr lt(com.google.firebase.firestore.pipeline.Expr left, com.google.firebase.firestore.pipeline.Expr right);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr lt(com.google.firebase.firestore.pipeline.Expr left, Object right);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr lt(Object value);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr lt(String fieldName, com.google.firebase.firestore.pipeline.Expr expression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr lt(String fieldName, Object right);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr lte(com.google.firebase.firestore.pipeline.Expr other);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr lte(com.google.firebase.firestore.pipeline.Expr left, com.google.firebase.firestore.pipeline.Expr right);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr lte(com.google.firebase.firestore.pipeline.Expr left, Object right);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr lte(Object value);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr lte(String fieldName, com.google.firebase.firestore.pipeline.Expr expression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr lte(String fieldName, Object value);
+    method public static final com.google.firebase.firestore.pipeline.Expr map(java.util.Map<java.lang.String,?> elements);
+    method public static final com.google.firebase.firestore.pipeline.Expr mapGet(com.google.firebase.firestore.pipeline.Expr mapExpression, String key);
+    method public final com.google.firebase.firestore.pipeline.Expr mapGet(String key);
+    method public static final com.google.firebase.firestore.pipeline.Expr mapGet(String fieldName, String key);
+    method public static final com.google.firebase.firestore.pipeline.Expr mapMerge(com.google.firebase.firestore.pipeline.Expr firstMap, com.google.firebase.firestore.pipeline.Expr secondMap, com.google.firebase.firestore.pipeline.Expr... otherMaps);
+    method public final com.google.firebase.firestore.pipeline.Expr mapMerge(com.google.firebase.firestore.pipeline.Expr mapExpr, com.google.firebase.firestore.pipeline.Expr... otherMaps);
+    method public static final com.google.firebase.firestore.pipeline.Expr mapMerge(String firstMapFieldName, com.google.firebase.firestore.pipeline.Expr secondMap, com.google.firebase.firestore.pipeline.Expr... otherMaps);
+    method public final com.google.firebase.firestore.pipeline.Expr mapRemove(com.google.firebase.firestore.pipeline.Expr key);
+    method public static final com.google.firebase.firestore.pipeline.Expr mapRemove(com.google.firebase.firestore.pipeline.Expr mapExpr, com.google.firebase.firestore.pipeline.Expr key);
+    method public static final com.google.firebase.firestore.pipeline.Expr mapRemove(com.google.firebase.firestore.pipeline.Expr mapExpr, String key);
+    method public final com.google.firebase.firestore.pipeline.Expr mapRemove(String key);
+    method public static final com.google.firebase.firestore.pipeline.Expr mapRemove(String mapField, com.google.firebase.firestore.pipeline.Expr key);
+    method public static final com.google.firebase.firestore.pipeline.Expr mapRemove(String mapField, String key);
+    method public final com.google.firebase.firestore.pipeline.AggregateFunction maximum();
+    method public final com.google.firebase.firestore.pipeline.AggregateFunction minimum();
+    method public final com.google.firebase.firestore.pipeline.Expr mod(com.google.firebase.firestore.pipeline.Expr divisor);
+    method public static final com.google.firebase.firestore.pipeline.Expr mod(com.google.firebase.firestore.pipeline.Expr dividend, com.google.firebase.firestore.pipeline.Expr divisor);
+    method public static final com.google.firebase.firestore.pipeline.Expr mod(com.google.firebase.firestore.pipeline.Expr dividend, Number divisor);
+    method public final com.google.firebase.firestore.pipeline.Expr mod(Number divisor);
+    method public static final com.google.firebase.firestore.pipeline.Expr mod(String dividendFieldName, com.google.firebase.firestore.pipeline.Expr divisor);
+    method public static final com.google.firebase.firestore.pipeline.Expr mod(String dividendFieldName, Number divisor);
+    method public final com.google.firebase.firestore.pipeline.Expr multiply(com.google.firebase.firestore.pipeline.Expr second);
+    method public static final com.google.firebase.firestore.pipeline.Expr multiply(com.google.firebase.firestore.pipeline.Expr first, com.google.firebase.firestore.pipeline.Expr second);
+    method public static final com.google.firebase.firestore.pipeline.Expr multiply(com.google.firebase.firestore.pipeline.Expr first, Number second);
+    method public final com.google.firebase.firestore.pipeline.Expr multiply(Number second);
+    method public static final com.google.firebase.firestore.pipeline.Expr multiply(String numericFieldName, com.google.firebase.firestore.pipeline.Expr second);
+    method public static final com.google.firebase.firestore.pipeline.Expr multiply(String numericFieldName, Number second);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr neq(com.google.firebase.firestore.pipeline.Expr other);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr neq(com.google.firebase.firestore.pipeline.Expr left, com.google.firebase.firestore.pipeline.Expr right);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr neq(com.google.firebase.firestore.pipeline.Expr left, Object right);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr neq(Object value);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr neq(String fieldName, com.google.firebase.firestore.pipeline.Expr expression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr neq(String fieldName, Object value);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr not(com.google.firebase.firestore.pipeline.BooleanExpr condition);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr notEqAny(com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr notEqAny(com.google.firebase.firestore.pipeline.Expr expression, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr notEqAny(com.google.firebase.firestore.pipeline.Expr expression, java.util.List<?> values);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr notEqAny(String fieldName, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr notEqAny(String fieldName, java.util.List<?> values);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr notEqAny(java.util.List<?> values);
+    method public static final com.google.firebase.firestore.pipeline.Expr nullValue();
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr or(com.google.firebase.firestore.pipeline.BooleanExpr condition, com.google.firebase.firestore.pipeline.BooleanExpr... conditions);
+    method public final com.google.firebase.firestore.pipeline.Expr pow(com.google.firebase.firestore.pipeline.Expr exponent);
+    method public static final com.google.firebase.firestore.pipeline.Expr pow(com.google.firebase.firestore.pipeline.Expr numericExpr, com.google.firebase.firestore.pipeline.Expr exponent);
+    method public static final com.google.firebase.firestore.pipeline.Expr pow(com.google.firebase.firestore.pipeline.Expr numericExpr, Number exponent);
+    method public final com.google.firebase.firestore.pipeline.Expr pow(Number exponent);
+    method public static final com.google.firebase.firestore.pipeline.Expr pow(String numericField, com.google.firebase.firestore.pipeline.Expr exponent);
+    method public static final com.google.firebase.firestore.pipeline.Expr pow(String numericField, Number exponent);
+    method public static final com.google.firebase.firestore.pipeline.Expr rand();
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr regexContains(com.google.firebase.firestore.pipeline.Expr pattern);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr regexContains(com.google.firebase.firestore.pipeline.Expr stringExpression, com.google.firebase.firestore.pipeline.Expr pattern);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr regexContains(com.google.firebase.firestore.pipeline.Expr stringExpression, String pattern);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr regexContains(String pattern);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr regexContains(String fieldName, com.google.firebase.firestore.pipeline.Expr pattern);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr regexContains(String fieldName, String pattern);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr regexMatch(com.google.firebase.firestore.pipeline.Expr pattern);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr regexMatch(com.google.firebase.firestore.pipeline.Expr stringExpression, com.google.firebase.firestore.pipeline.Expr pattern);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr regexMatch(com.google.firebase.firestore.pipeline.Expr stringExpression, String pattern);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr regexMatch(String pattern);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr regexMatch(String fieldName, com.google.firebase.firestore.pipeline.Expr pattern);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr regexMatch(String fieldName, String pattern);
+    method public final com.google.firebase.firestore.pipeline.Expr replaceAll(com.google.firebase.firestore.pipeline.Expr find, com.google.firebase.firestore.pipeline.Expr replace);
+    method public static final com.google.firebase.firestore.pipeline.Expr replaceAll(com.google.firebase.firestore.pipeline.Expr stringExpression, com.google.firebase.firestore.pipeline.Expr find, com.google.firebase.firestore.pipeline.Expr replace);
+    method public static final com.google.firebase.firestore.pipeline.Expr replaceAll(com.google.firebase.firestore.pipeline.Expr stringExpression, String find, String replace);
+    method public static final com.google.firebase.firestore.pipeline.Expr replaceAll(String fieldName, com.google.firebase.firestore.pipeline.Expr find, com.google.firebase.firestore.pipeline.Expr replace);
+    method public final com.google.firebase.firestore.pipeline.Expr replaceAll(String find, String replace);
+    method public static final com.google.firebase.firestore.pipeline.Expr replaceAll(String fieldName, String find, String replace);
+    method public final com.google.firebase.firestore.pipeline.Expr replaceFirst(com.google.firebase.firestore.pipeline.Expr find, com.google.firebase.firestore.pipeline.Expr replace);
+    method public static final com.google.firebase.firestore.pipeline.Expr replaceFirst(com.google.firebase.firestore.pipeline.Expr stringExpression, com.google.firebase.firestore.pipeline.Expr find, com.google.firebase.firestore.pipeline.Expr replace);
+    method public static final com.google.firebase.firestore.pipeline.Expr replaceFirst(com.google.firebase.firestore.pipeline.Expr stringExpression, String find, String replace);
+    method public static final com.google.firebase.firestore.pipeline.Expr replaceFirst(String fieldName, com.google.firebase.firestore.pipeline.Expr find, com.google.firebase.firestore.pipeline.Expr replace);
+    method public final com.google.firebase.firestore.pipeline.Expr replaceFirst(String find, String replace);
+    method public static final com.google.firebase.firestore.pipeline.Expr replaceFirst(String fieldName, String find, String replace);
+    method public final com.google.firebase.firestore.pipeline.Expr reverse();
+    method public static final com.google.firebase.firestore.pipeline.Expr reverse(com.google.firebase.firestore.pipeline.Expr stringExpression);
+    method public static final com.google.firebase.firestore.pipeline.Expr reverse(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.Expr round();
+    method public static final com.google.firebase.firestore.pipeline.Expr round(com.google.firebase.firestore.pipeline.Expr numericExpr);
+    method public static final com.google.firebase.firestore.pipeline.Expr round(String numericField);
+    method public final com.google.firebase.firestore.pipeline.Expr roundToPrecision(com.google.firebase.firestore.pipeline.Expr decimalPlace);
+    method public static final com.google.firebase.firestore.pipeline.Expr roundToPrecision(com.google.firebase.firestore.pipeline.Expr numericExpr, com.google.firebase.firestore.pipeline.Expr decimalPlace);
+    method public static final com.google.firebase.firestore.pipeline.Expr roundToPrecision(com.google.firebase.firestore.pipeline.Expr numericExpr, int decimalPlace);
+    method public final com.google.firebase.firestore.pipeline.Expr roundToPrecision(int decimalPlace);
+    method public static final com.google.firebase.firestore.pipeline.Expr roundToPrecision(String numericField, com.google.firebase.firestore.pipeline.Expr decimalPlace);
+    method public static final com.google.firebase.firestore.pipeline.Expr roundToPrecision(String numericField, int decimalPlace);
+    method public final com.google.firebase.firestore.pipeline.Expr sqrt();
+    method public static final com.google.firebase.firestore.pipeline.Expr sqrt(com.google.firebase.firestore.pipeline.Expr numericExpr);
+    method public static final com.google.firebase.firestore.pipeline.Expr sqrt(String numericField);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr startsWith(com.google.firebase.firestore.pipeline.Expr prefix);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr startsWith(com.google.firebase.firestore.pipeline.Expr stringExpr, com.google.firebase.firestore.pipeline.Expr prefix);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr startsWith(com.google.firebase.firestore.pipeline.Expr stringExpr, String prefix);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr startsWith(String prefix);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr startsWith(String fieldName, com.google.firebase.firestore.pipeline.Expr prefix);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr startsWith(String fieldName, String prefix);
+    method public static final com.google.firebase.firestore.pipeline.Expr strConcat(com.google.firebase.firestore.pipeline.Expr firstString, com.google.firebase.firestore.pipeline.Expr... otherStrings);
+    method public static final com.google.firebase.firestore.pipeline.Expr strConcat(com.google.firebase.firestore.pipeline.Expr firstString, java.lang.Object... otherStrings);
+    method public final com.google.firebase.firestore.pipeline.Expr strConcat(com.google.firebase.firestore.pipeline.Expr... stringExpressions);
+    method public final com.google.firebase.firestore.pipeline.Expr strConcat(java.lang.Object... strings);
+    method public static final com.google.firebase.firestore.pipeline.Expr strConcat(String fieldName, com.google.firebase.firestore.pipeline.Expr... otherStrings);
+    method public static final com.google.firebase.firestore.pipeline.Expr strConcat(String fieldName, java.lang.Object... otherStrings);
+    method public final com.google.firebase.firestore.pipeline.Expr strConcat(java.lang.String... strings);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr strContains(com.google.firebase.firestore.pipeline.Expr substring);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr strContains(com.google.firebase.firestore.pipeline.Expr stringExpression, com.google.firebase.firestore.pipeline.Expr substring);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr strContains(com.google.firebase.firestore.pipeline.Expr stringExpression, String substring);
+    method public final com.google.firebase.firestore.pipeline.BooleanExpr strContains(String substring);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr strContains(String fieldName, com.google.firebase.firestore.pipeline.Expr substring);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr strContains(String fieldName, String substring);
+    method public final com.google.firebase.firestore.pipeline.Expr subtract(com.google.firebase.firestore.pipeline.Expr subtrahend);
+    method public static final com.google.firebase.firestore.pipeline.Expr subtract(com.google.firebase.firestore.pipeline.Expr minuend, com.google.firebase.firestore.pipeline.Expr subtrahend);
+    method public static final com.google.firebase.firestore.pipeline.Expr subtract(com.google.firebase.firestore.pipeline.Expr minuend, Number subtrahend);
+    method public final com.google.firebase.firestore.pipeline.Expr subtract(Number subtrahend);
+    method public static final com.google.firebase.firestore.pipeline.Expr subtract(String numericFieldName, com.google.firebase.firestore.pipeline.Expr subtrahend);
+    method public static final com.google.firebase.firestore.pipeline.Expr subtract(String numericFieldName, Number subtrahend);
+    method public final com.google.firebase.firestore.pipeline.AggregateFunction sum();
+    method public final com.google.firebase.firestore.pipeline.Expr timestampAdd(com.google.firebase.firestore.pipeline.Expr unit, com.google.firebase.firestore.pipeline.Expr amount);
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampAdd(com.google.firebase.firestore.pipeline.Expr timestamp, com.google.firebase.firestore.pipeline.Expr unit, com.google.firebase.firestore.pipeline.Expr amount);
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampAdd(com.google.firebase.firestore.pipeline.Expr timestamp, String unit, double amount);
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampAdd(String fieldName, com.google.firebase.firestore.pipeline.Expr unit, com.google.firebase.firestore.pipeline.Expr amount);
+    method public final com.google.firebase.firestore.pipeline.Expr timestampAdd(String unit, double amount);
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampAdd(String fieldName, String unit, double amount);
+    method public final com.google.firebase.firestore.pipeline.Expr timestampSub(com.google.firebase.firestore.pipeline.Expr unit, com.google.firebase.firestore.pipeline.Expr amount);
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampSub(com.google.firebase.firestore.pipeline.Expr timestamp, com.google.firebase.firestore.pipeline.Expr unit, com.google.firebase.firestore.pipeline.Expr amount);
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampSub(com.google.firebase.firestore.pipeline.Expr timestamp, String unit, double amount);
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampSub(String fieldName, com.google.firebase.firestore.pipeline.Expr unit, com.google.firebase.firestore.pipeline.Expr amount);
+    method public final com.google.firebase.firestore.pipeline.Expr timestampSub(String unit, double amount);
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampSub(String fieldName, String unit, double amount);
+    method public final com.google.firebase.firestore.pipeline.Expr timestampToUnixMicros();
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampToUnixMicros(com.google.firebase.firestore.pipeline.Expr expr);
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampToUnixMicros(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.Expr timestampToUnixMillis();
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampToUnixMillis(com.google.firebase.firestore.pipeline.Expr expr);
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampToUnixMillis(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.Expr timestampToUnixSeconds();
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampToUnixSeconds(com.google.firebase.firestore.pipeline.Expr expr);
+    method public static final com.google.firebase.firestore.pipeline.Expr timestampToUnixSeconds(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.Expr toLower();
+    method public static final com.google.firebase.firestore.pipeline.Expr toLower(com.google.firebase.firestore.pipeline.Expr stringExpression);
+    method public static final com.google.firebase.firestore.pipeline.Expr toLower(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.Expr toUpper();
+    method public static final com.google.firebase.firestore.pipeline.Expr toUpper(com.google.firebase.firestore.pipeline.Expr stringExpression);
+    method public static final com.google.firebase.firestore.pipeline.Expr toUpper(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.Expr trim();
+    method public static final com.google.firebase.firestore.pipeline.Expr trim(com.google.firebase.firestore.pipeline.Expr stringExpression);
+    method public static final com.google.firebase.firestore.pipeline.Expr trim(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.Expr unixMicrosToTimestamp();
+    method public static final com.google.firebase.firestore.pipeline.Expr unixMicrosToTimestamp(com.google.firebase.firestore.pipeline.Expr expr);
+    method public static final com.google.firebase.firestore.pipeline.Expr unixMicrosToTimestamp(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.Expr unixMillisToTimestamp();
+    method public static final com.google.firebase.firestore.pipeline.Expr unixMillisToTimestamp(com.google.firebase.firestore.pipeline.Expr expr);
+    method public static final com.google.firebase.firestore.pipeline.Expr unixMillisToTimestamp(String fieldName);
+    method public final com.google.firebase.firestore.pipeline.Expr unixSecondsToTimestamp();
+    method public static final com.google.firebase.firestore.pipeline.Expr unixSecondsToTimestamp(com.google.firebase.firestore.pipeline.Expr expr);
+    method public static final com.google.firebase.firestore.pipeline.Expr unixSecondsToTimestamp(String fieldName);
+    method public static final com.google.firebase.firestore.pipeline.Expr vector(com.google.firebase.firestore.VectorValue vector);
+    method public static final com.google.firebase.firestore.pipeline.Expr vector(double[] vector);
+    method public final com.google.firebase.firestore.pipeline.Expr vectorLength();
+    method public static final com.google.firebase.firestore.pipeline.Expr vectorLength(com.google.firebase.firestore.pipeline.Expr vectorExpression);
+    method public static final com.google.firebase.firestore.pipeline.Expr vectorLength(String fieldName);
+    method public static final com.google.firebase.firestore.pipeline.BooleanExpr xor(com.google.firebase.firestore.pipeline.BooleanExpr condition, com.google.firebase.firestore.pipeline.BooleanExpr... conditions);
+    field public static final com.google.firebase.firestore.pipeline.Expr.Companion Companion;
+  }
+
+  public static final class Expr.Companion {
+    method public com.google.firebase.firestore.pipeline.Expr add(com.google.firebase.firestore.pipeline.Expr first, com.google.firebase.firestore.pipeline.Expr second);
+    method public com.google.firebase.firestore.pipeline.Expr add(com.google.firebase.firestore.pipeline.Expr first, Number second);
+    method public com.google.firebase.firestore.pipeline.Expr add(String numericFieldName, com.google.firebase.firestore.pipeline.Expr second);
+    method public com.google.firebase.firestore.pipeline.Expr add(String numericFieldName, Number second);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr and(com.google.firebase.firestore.pipeline.BooleanExpr condition, com.google.firebase.firestore.pipeline.BooleanExpr... conditions);
+    method public com.google.firebase.firestore.pipeline.Expr arrayConcat(com.google.firebase.firestore.pipeline.Expr firstArray, com.google.firebase.firestore.pipeline.Expr secondArray, java.lang.Object... otherArrays);
+    method public com.google.firebase.firestore.pipeline.Expr arrayConcat(com.google.firebase.firestore.pipeline.Expr firstArray, Object secondArray, java.lang.Object... otherArrays);
+    method public com.google.firebase.firestore.pipeline.Expr arrayConcat(String firstArrayField, com.google.firebase.firestore.pipeline.Expr secondArray, java.lang.Object... otherArrays);
+    method public com.google.firebase.firestore.pipeline.Expr arrayConcat(String firstArrayField, Object secondArray, java.lang.Object... otherArrays);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr arrayContains(com.google.firebase.firestore.pipeline.Expr array, com.google.firebase.firestore.pipeline.Expr element);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr arrayContains(com.google.firebase.firestore.pipeline.Expr array, Object element);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr arrayContains(String arrayFieldName, com.google.firebase.firestore.pipeline.Expr element);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr arrayContains(String arrayFieldName, Object element);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAll(com.google.firebase.firestore.pipeline.Expr array, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAll(com.google.firebase.firestore.pipeline.Expr array, java.util.List<?> values);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAll(String arrayFieldName, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAll(String arrayFieldName, java.util.List<?> values);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAny(com.google.firebase.firestore.pipeline.Expr array, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAny(com.google.firebase.firestore.pipeline.Expr array, java.util.List<?> values);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAny(String arrayFieldName, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr arrayContainsAny(String arrayFieldName, java.util.List<?> values);
+    method public com.google.firebase.firestore.pipeline.Expr arrayLength(com.google.firebase.firestore.pipeline.Expr array);
+    method public com.google.firebase.firestore.pipeline.Expr arrayLength(String arrayFieldName);
+    method public com.google.firebase.firestore.pipeline.Expr arrayOffset(com.google.firebase.firestore.pipeline.Expr array, com.google.firebase.firestore.pipeline.Expr offset);
+    method public com.google.firebase.firestore.pipeline.Expr arrayOffset(com.google.firebase.firestore.pipeline.Expr array, int offset);
+    method public com.google.firebase.firestore.pipeline.Expr arrayOffset(String arrayFieldName, com.google.firebase.firestore.pipeline.Expr offset);
+    method public com.google.firebase.firestore.pipeline.Expr arrayOffset(String arrayFieldName, int offset);
+    method public com.google.firebase.firestore.pipeline.Expr arrayReverse(com.google.firebase.firestore.pipeline.Expr array);
+    method public com.google.firebase.firestore.pipeline.Expr arrayReverse(String arrayFieldName);
+    method public com.google.firebase.firestore.pipeline.Expr bitAnd(com.google.firebase.firestore.pipeline.Expr bits, byte[] bitsOther);
+    method public com.google.firebase.firestore.pipeline.Expr bitAnd(com.google.firebase.firestore.pipeline.Expr bits, com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public com.google.firebase.firestore.pipeline.Expr bitAnd(String bitsFieldName, byte[] bitsOther);
+    method public com.google.firebase.firestore.pipeline.Expr bitAnd(String bitsFieldName, com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public com.google.firebase.firestore.pipeline.Expr bitLeftShift(com.google.firebase.firestore.pipeline.Expr bits, com.google.firebase.firestore.pipeline.Expr numberExpr);
+    method public com.google.firebase.firestore.pipeline.Expr bitLeftShift(com.google.firebase.firestore.pipeline.Expr bits, int number);
+    method public com.google.firebase.firestore.pipeline.Expr bitLeftShift(String bitsFieldName, com.google.firebase.firestore.pipeline.Expr numberExpr);
+    method public com.google.firebase.firestore.pipeline.Expr bitLeftShift(String bitsFieldName, int number);
+    method public com.google.firebase.firestore.pipeline.Expr bitNot(com.google.firebase.firestore.pipeline.Expr bits);
+    method public com.google.firebase.firestore.pipeline.Expr bitNot(String bitsFieldName);
+    method public com.google.firebase.firestore.pipeline.Expr bitOr(com.google.firebase.firestore.pipeline.Expr bits, byte[] bitsOther);
+    method public com.google.firebase.firestore.pipeline.Expr bitOr(com.google.firebase.firestore.pipeline.Expr bits, com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public com.google.firebase.firestore.pipeline.Expr bitOr(String bitsFieldName, byte[] bitsOther);
+    method public com.google.firebase.firestore.pipeline.Expr bitOr(String bitsFieldName, com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public com.google.firebase.firestore.pipeline.Expr bitRightShift(com.google.firebase.firestore.pipeline.Expr bits, com.google.firebase.firestore.pipeline.Expr numberExpr);
+    method public com.google.firebase.firestore.pipeline.Expr bitRightShift(com.google.firebase.firestore.pipeline.Expr bits, int number);
+    method public com.google.firebase.firestore.pipeline.Expr bitRightShift(String bitsFieldName, com.google.firebase.firestore.pipeline.Expr numberExpr);
+    method public com.google.firebase.firestore.pipeline.Expr bitRightShift(String bitsFieldName, int number);
+    method public com.google.firebase.firestore.pipeline.Expr bitXor(com.google.firebase.firestore.pipeline.Expr bits, byte[] bitsOther);
+    method public com.google.firebase.firestore.pipeline.Expr bitXor(com.google.firebase.firestore.pipeline.Expr bits, com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public com.google.firebase.firestore.pipeline.Expr bitXor(String bitsFieldName, byte[] bitsOther);
+    method public com.google.firebase.firestore.pipeline.Expr bitXor(String bitsFieldName, com.google.firebase.firestore.pipeline.Expr bitsOther);
+    method public com.google.firebase.firestore.pipeline.Expr byteLength(com.google.firebase.firestore.pipeline.Expr value);
+    method public com.google.firebase.firestore.pipeline.Expr byteLength(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Expr ceil(com.google.firebase.firestore.pipeline.Expr numericExpr);
+    method public com.google.firebase.firestore.pipeline.Expr ceil(String numericField);
+    method public com.google.firebase.firestore.pipeline.Expr charLength(com.google.firebase.firestore.pipeline.Expr expr);
+    method public com.google.firebase.firestore.pipeline.Expr charLength(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Expr cond(com.google.firebase.firestore.pipeline.BooleanExpr condition, com.google.firebase.firestore.pipeline.Expr thenExpr, com.google.firebase.firestore.pipeline.Expr elseExpr);
+    method public com.google.firebase.firestore.pipeline.Expr cond(com.google.firebase.firestore.pipeline.BooleanExpr condition, Object thenValue, Object elseValue);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr constant(boolean value);
+    method public com.google.firebase.firestore.pipeline.Expr constant(byte[] value);
+    method public com.google.firebase.firestore.pipeline.Expr constant(com.google.firebase.firestore.Blob value);
+    method public com.google.firebase.firestore.pipeline.Expr constant(com.google.firebase.firestore.DocumentReference ref);
+    method public com.google.firebase.firestore.pipeline.Expr constant(com.google.firebase.firestore.GeoPoint value);
+    method public com.google.firebase.firestore.pipeline.Expr constant(com.google.firebase.firestore.VectorValue value);
+    method public com.google.firebase.firestore.pipeline.Expr constant(com.google.firebase.Timestamp value);
+    method public com.google.firebase.firestore.pipeline.Expr constant(Number value);
+    method public com.google.firebase.firestore.pipeline.Expr constant(String value);
+    method public com.google.firebase.firestore.pipeline.Expr constant(java.util.Date value);
+    method public com.google.firebase.firestore.pipeline.Expr cosineDistance(com.google.firebase.firestore.pipeline.Expr vector1, com.google.firebase.firestore.pipeline.Expr vector2);
+    method public com.google.firebase.firestore.pipeline.Expr cosineDistance(com.google.firebase.firestore.pipeline.Expr vector1, com.google.firebase.firestore.VectorValue vector2);
+    method public com.google.firebase.firestore.pipeline.Expr cosineDistance(com.google.firebase.firestore.pipeline.Expr vector1, double[] vector2);
+    method public com.google.firebase.firestore.pipeline.Expr cosineDistance(String vectorFieldName, com.google.firebase.firestore.pipeline.Expr vector);
+    method public com.google.firebase.firestore.pipeline.Expr cosineDistance(String vectorFieldName, com.google.firebase.firestore.VectorValue vector);
+    method public com.google.firebase.firestore.pipeline.Expr cosineDistance(String vectorFieldName, double[] vector);
+    method public com.google.firebase.firestore.pipeline.Expr divide(com.google.firebase.firestore.pipeline.Expr dividend, com.google.firebase.firestore.pipeline.Expr divisor);
+    method public com.google.firebase.firestore.pipeline.Expr divide(com.google.firebase.firestore.pipeline.Expr dividend, Number divisor);
+    method public com.google.firebase.firestore.pipeline.Expr divide(String dividendFieldName, com.google.firebase.firestore.pipeline.Expr divisor);
+    method public com.google.firebase.firestore.pipeline.Expr divide(String dividendFieldName, Number divisor);
+    method public com.google.firebase.firestore.pipeline.Expr documentId(com.google.firebase.firestore.DocumentReference docRef);
+    method public com.google.firebase.firestore.pipeline.Expr documentId(com.google.firebase.firestore.pipeline.Expr documentPath);
+    method public com.google.firebase.firestore.pipeline.Expr documentId(String documentPath);
+    method public com.google.firebase.firestore.pipeline.Expr dotProduct(com.google.firebase.firestore.pipeline.Expr vector1, com.google.firebase.firestore.pipeline.Expr vector2);
+    method public com.google.firebase.firestore.pipeline.Expr dotProduct(com.google.firebase.firestore.pipeline.Expr vector1, com.google.firebase.firestore.VectorValue vector2);
+    method public com.google.firebase.firestore.pipeline.Expr dotProduct(com.google.firebase.firestore.pipeline.Expr vector1, double[] vector2);
+    method public com.google.firebase.firestore.pipeline.Expr dotProduct(String vectorFieldName, com.google.firebase.firestore.pipeline.Expr vector);
+    method public com.google.firebase.firestore.pipeline.Expr dotProduct(String vectorFieldName, com.google.firebase.firestore.VectorValue vector);
+    method public com.google.firebase.firestore.pipeline.Expr dotProduct(String vectorFieldName, double[] vector);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr endsWith(com.google.firebase.firestore.pipeline.Expr stringExpr, com.google.firebase.firestore.pipeline.Expr suffix);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr endsWith(com.google.firebase.firestore.pipeline.Expr stringExpr, String suffix);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr endsWith(String fieldName, com.google.firebase.firestore.pipeline.Expr suffix);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr endsWith(String fieldName, String suffix);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr eq(com.google.firebase.firestore.pipeline.Expr left, com.google.firebase.firestore.pipeline.Expr right);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr eq(com.google.firebase.firestore.pipeline.Expr left, Object right);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr eq(String fieldName, com.google.firebase.firestore.pipeline.Expr expression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr eq(String fieldName, Object value);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr eqAny(com.google.firebase.firestore.pipeline.Expr expression, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr eqAny(com.google.firebase.firestore.pipeline.Expr expression, java.util.List<?> values);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr eqAny(String fieldName, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr eqAny(String fieldName, java.util.List<?> values);
+    method public com.google.firebase.firestore.pipeline.Expr euclideanDistance(com.google.firebase.firestore.pipeline.Expr vector1, com.google.firebase.firestore.pipeline.Expr vector2);
+    method public com.google.firebase.firestore.pipeline.Expr euclideanDistance(com.google.firebase.firestore.pipeline.Expr vector1, com.google.firebase.firestore.VectorValue vector2);
+    method public com.google.firebase.firestore.pipeline.Expr euclideanDistance(com.google.firebase.firestore.pipeline.Expr vector1, double[] vector2);
+    method public com.google.firebase.firestore.pipeline.Expr euclideanDistance(String vectorFieldName, com.google.firebase.firestore.pipeline.Expr vector);
+    method public com.google.firebase.firestore.pipeline.Expr euclideanDistance(String vectorFieldName, com.google.firebase.firestore.VectorValue vector);
+    method public com.google.firebase.firestore.pipeline.Expr euclideanDistance(String vectorFieldName, double[] vector);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr exists(com.google.firebase.firestore.pipeline.Expr value);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr exists(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Field field(com.google.firebase.firestore.FieldPath fieldPath);
+    method public com.google.firebase.firestore.pipeline.Field field(String name);
+    method public com.google.firebase.firestore.pipeline.Expr floor(com.google.firebase.firestore.pipeline.Expr numericExpr);
+    method public com.google.firebase.firestore.pipeline.Expr floor(String numericField);
+    method public com.google.firebase.firestore.pipeline.Expr generic(String name, com.google.firebase.firestore.pipeline.Expr... expr);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr gt(com.google.firebase.firestore.pipeline.Expr left, com.google.firebase.firestore.pipeline.Expr right);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr gt(com.google.firebase.firestore.pipeline.Expr left, Object right);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr gt(String fieldName, com.google.firebase.firestore.pipeline.Expr expression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr gt(String fieldName, Object value);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr gte(com.google.firebase.firestore.pipeline.Expr left, com.google.firebase.firestore.pipeline.Expr right);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr gte(com.google.firebase.firestore.pipeline.Expr left, Object right);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr gte(String fieldName, com.google.firebase.firestore.pipeline.Expr expression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr gte(String fieldName, Object value);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr ifError(com.google.firebase.firestore.pipeline.BooleanExpr tryExpr, com.google.firebase.firestore.pipeline.BooleanExpr catchExpr);
+    method public com.google.firebase.firestore.pipeline.Expr ifError(com.google.firebase.firestore.pipeline.Expr tryExpr, com.google.firebase.firestore.pipeline.Expr catchExpr);
+    method public com.google.firebase.firestore.pipeline.Expr ifError(com.google.firebase.firestore.pipeline.Expr tryExpr, Object catchValue);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr isAbsent(com.google.firebase.firestore.pipeline.Expr value);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr isAbsent(String fieldName);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr isNan(com.google.firebase.firestore.pipeline.Expr expr);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr isNan(String fieldName);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr isNotNan(com.google.firebase.firestore.pipeline.Expr expr);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr isNotNan(String fieldName);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr isNotNull(com.google.firebase.firestore.pipeline.Expr expr);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr isNotNull(String fieldName);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr isNull(com.google.firebase.firestore.pipeline.Expr expr);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr isNull(String fieldName);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr like(com.google.firebase.firestore.pipeline.Expr stringExpression, com.google.firebase.firestore.pipeline.Expr pattern);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr like(com.google.firebase.firestore.pipeline.Expr stringExpression, String pattern);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr like(String fieldName, com.google.firebase.firestore.pipeline.Expr pattern);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr like(String fieldName, String pattern);
+    method public com.google.firebase.firestore.pipeline.Expr logicalMaximum(com.google.firebase.firestore.pipeline.Expr expr, java.lang.Object... others);
+    method public com.google.firebase.firestore.pipeline.Expr logicalMaximum(String fieldName, java.lang.Object... others);
+    method public com.google.firebase.firestore.pipeline.Expr logicalMinimum(com.google.firebase.firestore.pipeline.Expr expr, java.lang.Object... others);
+    method public com.google.firebase.firestore.pipeline.Expr logicalMinimum(String fieldName, java.lang.Object... others);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr lt(com.google.firebase.firestore.pipeline.Expr left, com.google.firebase.firestore.pipeline.Expr right);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr lt(com.google.firebase.firestore.pipeline.Expr left, Object right);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr lt(String fieldName, com.google.firebase.firestore.pipeline.Expr expression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr lt(String fieldName, Object right);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr lte(com.google.firebase.firestore.pipeline.Expr left, com.google.firebase.firestore.pipeline.Expr right);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr lte(com.google.firebase.firestore.pipeline.Expr left, Object right);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr lte(String fieldName, com.google.firebase.firestore.pipeline.Expr expression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr lte(String fieldName, Object value);
+    method public com.google.firebase.firestore.pipeline.Expr map(java.util.Map<java.lang.String,?> elements);
+    method public com.google.firebase.firestore.pipeline.Expr mapGet(com.google.firebase.firestore.pipeline.Expr mapExpression, String key);
+    method public com.google.firebase.firestore.pipeline.Expr mapGet(String fieldName, String key);
+    method public com.google.firebase.firestore.pipeline.Expr mapMerge(com.google.firebase.firestore.pipeline.Expr firstMap, com.google.firebase.firestore.pipeline.Expr secondMap, com.google.firebase.firestore.pipeline.Expr... otherMaps);
+    method public com.google.firebase.firestore.pipeline.Expr mapMerge(String firstMapFieldName, com.google.firebase.firestore.pipeline.Expr secondMap, com.google.firebase.firestore.pipeline.Expr... otherMaps);
+    method public com.google.firebase.firestore.pipeline.Expr mapRemove(com.google.firebase.firestore.pipeline.Expr mapExpr, com.google.firebase.firestore.pipeline.Expr key);
+    method public com.google.firebase.firestore.pipeline.Expr mapRemove(com.google.firebase.firestore.pipeline.Expr mapExpr, String key);
+    method public com.google.firebase.firestore.pipeline.Expr mapRemove(String mapField, com.google.firebase.firestore.pipeline.Expr key);
+    method public com.google.firebase.firestore.pipeline.Expr mapRemove(String mapField, String key);
+    method public com.google.firebase.firestore.pipeline.Expr mod(com.google.firebase.firestore.pipeline.Expr dividend, com.google.firebase.firestore.pipeline.Expr divisor);
+    method public com.google.firebase.firestore.pipeline.Expr mod(com.google.firebase.firestore.pipeline.Expr dividend, Number divisor);
+    method public com.google.firebase.firestore.pipeline.Expr mod(String dividendFieldName, com.google.firebase.firestore.pipeline.Expr divisor);
+    method public com.google.firebase.firestore.pipeline.Expr mod(String dividendFieldName, Number divisor);
+    method public com.google.firebase.firestore.pipeline.Expr multiply(com.google.firebase.firestore.pipeline.Expr first, com.google.firebase.firestore.pipeline.Expr second);
+    method public com.google.firebase.firestore.pipeline.Expr multiply(com.google.firebase.firestore.pipeline.Expr first, Number second);
+    method public com.google.firebase.firestore.pipeline.Expr multiply(String numericFieldName, com.google.firebase.firestore.pipeline.Expr second);
+    method public com.google.firebase.firestore.pipeline.Expr multiply(String numericFieldName, Number second);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr neq(com.google.firebase.firestore.pipeline.Expr left, com.google.firebase.firestore.pipeline.Expr right);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr neq(com.google.firebase.firestore.pipeline.Expr left, Object right);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr neq(String fieldName, com.google.firebase.firestore.pipeline.Expr expression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr neq(String fieldName, Object value);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr not(com.google.firebase.firestore.pipeline.BooleanExpr condition);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr notEqAny(com.google.firebase.firestore.pipeline.Expr expression, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr notEqAny(com.google.firebase.firestore.pipeline.Expr expression, java.util.List<?> values);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr notEqAny(String fieldName, com.google.firebase.firestore.pipeline.Expr arrayExpression);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr notEqAny(String fieldName, java.util.List<?> values);
+    method public com.google.firebase.firestore.pipeline.Expr nullValue();
+    method public com.google.firebase.firestore.pipeline.BooleanExpr or(com.google.firebase.firestore.pipeline.BooleanExpr condition, com.google.firebase.firestore.pipeline.BooleanExpr... conditions);
+    method public com.google.firebase.firestore.pipeline.Expr pow(com.google.firebase.firestore.pipeline.Expr numericExpr, com.google.firebase.firestore.pipeline.Expr exponent);
+    method public com.google.firebase.firestore.pipeline.Expr pow(com.google.firebase.firestore.pipeline.Expr numericExpr, Number exponent);
+    method public com.google.firebase.firestore.pipeline.Expr pow(String numericField, com.google.firebase.firestore.pipeline.Expr exponent);
+    method public com.google.firebase.firestore.pipeline.Expr pow(String numericField, Number exponent);
+    method public com.google.firebase.firestore.pipeline.Expr rand();
+    method public com.google.firebase.firestore.pipeline.BooleanExpr regexContains(com.google.firebase.firestore.pipeline.Expr stringExpression, com.google.firebase.firestore.pipeline.Expr pattern);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr regexContains(com.google.firebase.firestore.pipeline.Expr stringExpression, String pattern);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr regexContains(String fieldName, com.google.firebase.firestore.pipeline.Expr pattern);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr regexContains(String fieldName, String pattern);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr regexMatch(com.google.firebase.firestore.pipeline.Expr stringExpression, com.google.firebase.firestore.pipeline.Expr pattern);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr regexMatch(com.google.firebase.firestore.pipeline.Expr stringExpression, String pattern);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr regexMatch(String fieldName, com.google.firebase.firestore.pipeline.Expr pattern);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr regexMatch(String fieldName, String pattern);
+    method public com.google.firebase.firestore.pipeline.Expr replaceAll(com.google.firebase.firestore.pipeline.Expr stringExpression, com.google.firebase.firestore.pipeline.Expr find, com.google.firebase.firestore.pipeline.Expr replace);
+    method public com.google.firebase.firestore.pipeline.Expr replaceAll(com.google.firebase.firestore.pipeline.Expr stringExpression, String find, String replace);
+    method public com.google.firebase.firestore.pipeline.Expr replaceAll(String fieldName, com.google.firebase.firestore.pipeline.Expr find, com.google.firebase.firestore.pipeline.Expr replace);
+    method public com.google.firebase.firestore.pipeline.Expr replaceAll(String fieldName, String find, String replace);
+    method public com.google.firebase.firestore.pipeline.Expr replaceFirst(com.google.firebase.firestore.pipeline.Expr stringExpression, com.google.firebase.firestore.pipeline.Expr find, com.google.firebase.firestore.pipeline.Expr replace);
+    method public com.google.firebase.firestore.pipeline.Expr replaceFirst(com.google.firebase.firestore.pipeline.Expr stringExpression, String find, String replace);
+    method public com.google.firebase.firestore.pipeline.Expr replaceFirst(String fieldName, com.google.firebase.firestore.pipeline.Expr find, com.google.firebase.firestore.pipeline.Expr replace);
+    method public com.google.firebase.firestore.pipeline.Expr replaceFirst(String fieldName, String find, String replace);
+    method public com.google.firebase.firestore.pipeline.Expr reverse(com.google.firebase.firestore.pipeline.Expr stringExpression);
+    method public com.google.firebase.firestore.pipeline.Expr reverse(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Expr round(com.google.firebase.firestore.pipeline.Expr numericExpr);
+    method public com.google.firebase.firestore.pipeline.Expr round(String numericField);
+    method public com.google.firebase.firestore.pipeline.Expr roundToPrecision(com.google.firebase.firestore.pipeline.Expr numericExpr, com.google.firebase.firestore.pipeline.Expr decimalPlace);
+    method public com.google.firebase.firestore.pipeline.Expr roundToPrecision(com.google.firebase.firestore.pipeline.Expr numericExpr, int decimalPlace);
+    method public com.google.firebase.firestore.pipeline.Expr roundToPrecision(String numericField, com.google.firebase.firestore.pipeline.Expr decimalPlace);
+    method public com.google.firebase.firestore.pipeline.Expr roundToPrecision(String numericField, int decimalPlace);
+    method public com.google.firebase.firestore.pipeline.Expr sqrt(com.google.firebase.firestore.pipeline.Expr numericExpr);
+    method public com.google.firebase.firestore.pipeline.Expr sqrt(String numericField);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr startsWith(com.google.firebase.firestore.pipeline.Expr stringExpr, com.google.firebase.firestore.pipeline.Expr prefix);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr startsWith(com.google.firebase.firestore.pipeline.Expr stringExpr, String prefix);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr startsWith(String fieldName, com.google.firebase.firestore.pipeline.Expr prefix);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr startsWith(String fieldName, String prefix);
+    method public com.google.firebase.firestore.pipeline.Expr strConcat(com.google.firebase.firestore.pipeline.Expr firstString, com.google.firebase.firestore.pipeline.Expr... otherStrings);
+    method public com.google.firebase.firestore.pipeline.Expr strConcat(com.google.firebase.firestore.pipeline.Expr firstString, java.lang.Object... otherStrings);
+    method public com.google.firebase.firestore.pipeline.Expr strConcat(String fieldName, com.google.firebase.firestore.pipeline.Expr... otherStrings);
+    method public com.google.firebase.firestore.pipeline.Expr strConcat(String fieldName, java.lang.Object... otherStrings);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr strContains(com.google.firebase.firestore.pipeline.Expr stringExpression, com.google.firebase.firestore.pipeline.Expr substring);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr strContains(com.google.firebase.firestore.pipeline.Expr stringExpression, String substring);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr strContains(String fieldName, com.google.firebase.firestore.pipeline.Expr substring);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr strContains(String fieldName, String substring);
+    method public com.google.firebase.firestore.pipeline.Expr subtract(com.google.firebase.firestore.pipeline.Expr minuend, com.google.firebase.firestore.pipeline.Expr subtrahend);
+    method public com.google.firebase.firestore.pipeline.Expr subtract(com.google.firebase.firestore.pipeline.Expr minuend, Number subtrahend);
+    method public com.google.firebase.firestore.pipeline.Expr subtract(String numericFieldName, com.google.firebase.firestore.pipeline.Expr subtrahend);
+    method public com.google.firebase.firestore.pipeline.Expr subtract(String numericFieldName, Number subtrahend);
+    method public com.google.firebase.firestore.pipeline.Expr timestampAdd(com.google.firebase.firestore.pipeline.Expr timestamp, com.google.firebase.firestore.pipeline.Expr unit, com.google.firebase.firestore.pipeline.Expr amount);
+    method public com.google.firebase.firestore.pipeline.Expr timestampAdd(com.google.firebase.firestore.pipeline.Expr timestamp, String unit, double amount);
+    method public com.google.firebase.firestore.pipeline.Expr timestampAdd(String fieldName, com.google.firebase.firestore.pipeline.Expr unit, com.google.firebase.firestore.pipeline.Expr amount);
+    method public com.google.firebase.firestore.pipeline.Expr timestampAdd(String fieldName, String unit, double amount);
+    method public com.google.firebase.firestore.pipeline.Expr timestampSub(com.google.firebase.firestore.pipeline.Expr timestamp, com.google.firebase.firestore.pipeline.Expr unit, com.google.firebase.firestore.pipeline.Expr amount);
+    method public com.google.firebase.firestore.pipeline.Expr timestampSub(com.google.firebase.firestore.pipeline.Expr timestamp, String unit, double amount);
+    method public com.google.firebase.firestore.pipeline.Expr timestampSub(String fieldName, com.google.firebase.firestore.pipeline.Expr unit, com.google.firebase.firestore.pipeline.Expr amount);
+    method public com.google.firebase.firestore.pipeline.Expr timestampSub(String fieldName, String unit, double amount);
+    method public com.google.firebase.firestore.pipeline.Expr timestampToUnixMicros(com.google.firebase.firestore.pipeline.Expr expr);
+    method public com.google.firebase.firestore.pipeline.Expr timestampToUnixMicros(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Expr timestampToUnixMillis(com.google.firebase.firestore.pipeline.Expr expr);
+    method public com.google.firebase.firestore.pipeline.Expr timestampToUnixMillis(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Expr timestampToUnixSeconds(com.google.firebase.firestore.pipeline.Expr expr);
+    method public com.google.firebase.firestore.pipeline.Expr timestampToUnixSeconds(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Expr toLower(com.google.firebase.firestore.pipeline.Expr stringExpression);
+    method public com.google.firebase.firestore.pipeline.Expr toLower(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Expr toUpper(com.google.firebase.firestore.pipeline.Expr stringExpression);
+    method public com.google.firebase.firestore.pipeline.Expr toUpper(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Expr trim(com.google.firebase.firestore.pipeline.Expr stringExpression);
+    method public com.google.firebase.firestore.pipeline.Expr trim(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Expr unixMicrosToTimestamp(com.google.firebase.firestore.pipeline.Expr expr);
+    method public com.google.firebase.firestore.pipeline.Expr unixMicrosToTimestamp(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Expr unixMillisToTimestamp(com.google.firebase.firestore.pipeline.Expr expr);
+    method public com.google.firebase.firestore.pipeline.Expr unixMillisToTimestamp(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Expr unixSecondsToTimestamp(com.google.firebase.firestore.pipeline.Expr expr);
+    method public com.google.firebase.firestore.pipeline.Expr unixSecondsToTimestamp(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Expr vector(com.google.firebase.firestore.VectorValue vector);
+    method public com.google.firebase.firestore.pipeline.Expr vector(double[] vector);
+    method public com.google.firebase.firestore.pipeline.Expr vectorLength(com.google.firebase.firestore.pipeline.Expr vectorExpression);
+    method public com.google.firebase.firestore.pipeline.Expr vectorLength(String fieldName);
+    method public com.google.firebase.firestore.pipeline.BooleanExpr xor(com.google.firebase.firestore.pipeline.BooleanExpr condition, com.google.firebase.firestore.pipeline.BooleanExpr... conditions);
+  }
+
+  public final class ExprWithAlias extends com.google.firebase.firestore.pipeline.Selectable {
+  }
+
+  public final class Field extends com.google.firebase.firestore.pipeline.Selectable {
+    field public static final com.google.firebase.firestore.pipeline.Field.Companion Companion;
+    field public static final com.google.firebase.firestore.pipeline.Field DOCUMENT_ID;
+  }
+
+  public static final class Field.Companion {
+  }
+
+  public final class FindNearestStage extends com.google.firebase.firestore.pipeline.BaseStage<com.google.firebase.firestore.pipeline.FindNearestStage> {
+    method public static com.google.firebase.firestore.pipeline.FindNearestStage of(com.google.firebase.firestore.pipeline.Field vectorField, com.google.firebase.firestore.VectorValue vectorValue, com.google.firebase.firestore.pipeline.FindNearestStage.DistanceMeasure distanceMeasure);
+    method public static com.google.firebase.firestore.pipeline.FindNearestStage of(com.google.firebase.firestore.pipeline.Field vectorField, double[] vectorValue, com.google.firebase.firestore.pipeline.FindNearestStage.DistanceMeasure distanceMeasure);
+    method public static com.google.firebase.firestore.pipeline.FindNearestStage of(String vectorField, com.google.firebase.firestore.VectorValue vectorValue, com.google.firebase.firestore.pipeline.FindNearestStage.DistanceMeasure distanceMeasure);
+    method public static com.google.firebase.firestore.pipeline.FindNearestStage of(String vectorField, double[] vectorValue, com.google.firebase.firestore.pipeline.FindNearestStage.DistanceMeasure distanceMeasure);
+    method public com.google.firebase.firestore.pipeline.FindNearestStage withDistanceField(com.google.firebase.firestore.pipeline.Field distanceField);
+    method public com.google.firebase.firestore.pipeline.FindNearestStage withDistanceField(String distanceField);
+    method public com.google.firebase.firestore.pipeline.FindNearestStage withLimit(long limit);
+    field public static final com.google.firebase.firestore.pipeline.FindNearestStage.Companion Companion;
+  }
+
+  public static final class FindNearestStage.Companion {
+    method public com.google.firebase.firestore.pipeline.FindNearestStage of(com.google.firebase.firestore.pipeline.Field vectorField, com.google.firebase.firestore.VectorValue vectorValue, com.google.firebase.firestore.pipeline.FindNearestStage.DistanceMeasure distanceMeasure);
+    method public com.google.firebase.firestore.pipeline.FindNearestStage of(com.google.firebase.firestore.pipeline.Field vectorField, double[] vectorValue, com.google.firebase.firestore.pipeline.FindNearestStage.DistanceMeasure distanceMeasure);
+    method public com.google.firebase.firestore.pipeline.FindNearestStage of(String vectorField, com.google.firebase.firestore.VectorValue vectorValue, com.google.firebase.firestore.pipeline.FindNearestStage.DistanceMeasure distanceMeasure);
+    method public com.google.firebase.firestore.pipeline.FindNearestStage of(String vectorField, double[] vectorValue, com.google.firebase.firestore.pipeline.FindNearestStage.DistanceMeasure distanceMeasure);
+  }
+
+  public static final class FindNearestStage.DistanceMeasure {
+    field public static final error.NonExistentClass COSINE;
+    field public static final com.google.firebase.firestore.pipeline.FindNearestStage.DistanceMeasure.Companion Companion;
+    field public static final error.NonExistentClass DOT_PRODUCT;
+    field public static final error.NonExistentClass EUCLIDEAN;
+  }
+
+  public static final class FindNearestStage.DistanceMeasure.Companion {
+  }
+
+  public class FunctionExpr extends com.google.firebase.firestore.pipeline.Expr {
+  }
+
+  public final class GenericOptions extends com.google.firebase.firestore.pipeline.AbstractOptions<com.google.firebase.firestore.pipeline.GenericOptions> {
+    field public static final com.google.firebase.firestore.pipeline.GenericOptions.Companion Companion;
+    field public static final com.google.firebase.firestore.pipeline.GenericOptions DEFAULT;
+  }
+
+  public static final class GenericOptions.Companion {
+  }
+
+  public final class InternalOptions {
+    field public static final com.google.firebase.firestore.pipeline.InternalOptions.Companion Companion;
+    field public static final com.google.firebase.firestore.pipeline.InternalOptions EMPTY;
+  }
+
+  public static final class InternalOptions.Companion {
+    method public com.google.firebase.firestore.pipeline.InternalOptions of(String key, error.NonExistentClass value);
+  }
+
+  public final class Ordering {
+    method public static com.google.firebase.firestore.pipeline.Ordering ascending(com.google.firebase.firestore.pipeline.Expr expr);
+    method public static com.google.firebase.firestore.pipeline.Ordering ascending(String fieldName);
+    method public static com.google.firebase.firestore.pipeline.Ordering descending(com.google.firebase.firestore.pipeline.Expr expr);
+    method public static com.google.firebase.firestore.pipeline.Ordering descending(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Expr getExpr();
+    method public com.google.firebase.firestore.pipeline.Ordering reverse();
+    property public final com.google.firebase.firestore.pipeline.Expr expr;
+    field public static final com.google.firebase.firestore.pipeline.Ordering.Companion Companion;
+  }
+
+  public static final class Ordering.Companion {
+    method public com.google.firebase.firestore.pipeline.Ordering ascending(com.google.firebase.firestore.pipeline.Expr expr);
+    method public com.google.firebase.firestore.pipeline.Ordering ascending(String fieldName);
+    method public com.google.firebase.firestore.pipeline.Ordering descending(com.google.firebase.firestore.pipeline.Expr expr);
+    method public com.google.firebase.firestore.pipeline.Ordering descending(String fieldName);
+  }
+
+  public final class PipelineOptions extends com.google.firebase.firestore.pipeline.AbstractOptions<com.google.firebase.firestore.pipeline.PipelineOptions> {
+    method public com.google.firebase.firestore.pipeline.PipelineOptions withExplainOptions(com.google.firebase.firestore.pipeline.ExplainOptions options);
+    method public com.google.firebase.firestore.pipeline.PipelineOptions withIndexMode(com.google.firebase.firestore.pipeline.PipelineOptions.IndexMode indexMode);
+    field public static final com.google.firebase.firestore.pipeline.PipelineOptions.Companion Companion;
+    field public static final com.google.firebase.firestore.pipeline.PipelineOptions DEFAULT;
+  }
+
+  public static final class PipelineOptions.Companion {
+  }
+
+  public static final class PipelineOptions.IndexMode {
+    field public static final com.google.firebase.firestore.pipeline.PipelineOptions.IndexMode.Companion Companion;
+    field public static final com.google.firebase.firestore.pipeline.PipelineOptions.IndexMode RECOMMENDED;
+  }
+
+  public static final class PipelineOptions.IndexMode.Companion {
+  }
+
+  public final class SampleStage extends com.google.firebase.firestore.pipeline.BaseStage<com.google.firebase.firestore.pipeline.SampleStage> {
+    method public static com.google.firebase.firestore.pipeline.SampleStage withDocLimit(int documents);
+    method public static com.google.firebase.firestore.pipeline.SampleStage withPercentage(double percentage);
+    field public static final com.google.firebase.firestore.pipeline.SampleStage.Companion Companion;
+  }
+
+  public static final class SampleStage.Companion {
+    method public com.google.firebase.firestore.pipeline.SampleStage withDocLimit(int documents);
+    method public com.google.firebase.firestore.pipeline.SampleStage withPercentage(double percentage);
+  }
+
+  public static final class SampleStage.Mode {
+    field public static final com.google.firebase.firestore.pipeline.SampleStage.Mode.Companion Companion;
+  }
+
+  public static final class SampleStage.Mode.Companion {
+    method public error.NonExistentClass getDOCUMENTS();
+    method public error.NonExistentClass getPERCENT();
+    property public final error.NonExistentClass DOCUMENTS;
+    property public final error.NonExistentClass PERCENT;
+  }
+
+  public abstract class Selectable extends com.google.firebase.firestore.pipeline.Expr {
+    ctor public Selectable();
+  }
+
+  public final class Stage extends com.google.firebase.firestore.pipeline.BaseStage<com.google.firebase.firestore.pipeline.Stage> {
+    method public static com.google.firebase.firestore.pipeline.Stage ofName(String name);
+    method public com.google.firebase.firestore.pipeline.Stage withArguments(java.lang.Object... arguments);
+    field public static final com.google.firebase.firestore.pipeline.Stage.Companion Companion;
+  }
+
+  public static final class Stage.Companion {
+    method public com.google.firebase.firestore.pipeline.Stage ofName(String name);
+  }
+
+  public final class UnnestStage extends com.google.firebase.firestore.pipeline.BaseStage<com.google.firebase.firestore.pipeline.UnnestStage> {
+    method public static com.google.firebase.firestore.pipeline.UnnestStage withField(com.google.firebase.firestore.pipeline.Selectable arrayWithAlias);
+    method public static com.google.firebase.firestore.pipeline.UnnestStage withField(String arrayField, String alias);
+    method public com.google.firebase.firestore.pipeline.UnnestStage withIndexField(String indexField);
+    field public static final com.google.firebase.firestore.pipeline.UnnestStage.Companion Companion;
+  }
+
+  public static final class UnnestStage.Companion {
+    method public com.google.firebase.firestore.pipeline.UnnestStage withField(com.google.firebase.firestore.pipeline.Selectable arrayWithAlias);
+    method public com.google.firebase.firestore.pipeline.UnnestStage withField(String arrayField, String alias);
+  }
+
+}
+
diff --git a/firebase-firestore/src/androidTest/java/com/google/firebase/firestore/PipelineTest.java b/firebase-firestore/src/androidTest/java/com/google/firebase/firestore/PipelineTest.java
new file mode 100644
index 00000000000..5c9e26f5acb
--- /dev/null
+++ b/firebase-firestore/src/androidTest/java/com/google/firebase/firestore/PipelineTest.java
@@ -0,0 +1,901 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.firebase.firestore;
+
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.firebase.firestore.pipeline.Expr.add;
+import static com.google.firebase.firestore.pipeline.Expr.and;
+import static com.google.firebase.firestore.pipeline.Expr.arrayContains;
+import static com.google.firebase.firestore.pipeline.Expr.arrayContainsAny;
+import static com.google.firebase.firestore.pipeline.Expr.cosineDistance;
+import static com.google.firebase.firestore.pipeline.Expr.endsWith;
+import static com.google.firebase.firestore.pipeline.Expr.eq;
+import static com.google.firebase.firestore.pipeline.Expr.euclideanDistance;
+import static com.google.firebase.firestore.pipeline.Expr.field;
+import static com.google.firebase.firestore.pipeline.Expr.gt;
+import static com.google.firebase.firestore.pipeline.Expr.logicalMaximum;
+import static com.google.firebase.firestore.pipeline.Expr.lt;
+import static com.google.firebase.firestore.pipeline.Expr.lte;
+import static com.google.firebase.firestore.pipeline.Expr.mapGet;
+import static com.google.firebase.firestore.pipeline.Expr.neq;
+import static com.google.firebase.firestore.pipeline.Expr.not;
+import static com.google.firebase.firestore.pipeline.Expr.or;
+import static com.google.firebase.firestore.pipeline.Expr.startsWith;
+import static com.google.firebase.firestore.pipeline.Expr.strConcat;
+import static com.google.firebase.firestore.pipeline.Expr.subtract;
+import static com.google.firebase.firestore.pipeline.Expr.vector;
+import static com.google.firebase.firestore.pipeline.Ordering.ascending;
+import static com.google.firebase.firestore.testutil.IntegrationTestUtil.waitFor;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import com.google.android.gms.tasks.Task;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.ImmutableMap;
+import com.google.common.truth.Correspondence;
+import com.google.firebase.firestore.pipeline.AggregateFunction;
+import com.google.firebase.firestore.pipeline.AggregateStage;
+import com.google.firebase.firestore.pipeline.Expr;
+import com.google.firebase.firestore.pipeline.Stage;
+import com.google.firebase.firestore.testutil.IntegrationTestUtil;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.Map;
+import java.util.Objects;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public class PipelineTest {
+
+  private static final Correspondence<PipelineResult, Map<String, Object>> DATA_CORRESPONDENCE =
+      Correspondence.from(
+          (result, expected) -> {
+            assertThat(result.getData())
+                .comparingValuesUsing(
+                    Correspondence.from(
+                        (x, y) -> {
+                          if (x instanceof Long && y instanceof Integer) {
+                            return (long) x == (long) (int) y;
+                          }
+                          if (x instanceof Double && y instanceof Integer) {
+                            return (double) x == (double) (int) y;
+                          }
+                          return Objects.equals(x, y);
+                        },
+                        "MapValueCompare"))
+                .containsExactlyEntriesIn(expected);
+            return true;
+          },
+          "GetData");
+
+  private static final Correspondence<PipelineResult, String> ID_CORRESPONDENCE =
+      Correspondence.transforming(x -> x.getRef().getId(), "GetRefId");
+
+  private CollectionReference randomCol;
+  private FirebaseFirestore firestore;
+
+  @After
+  public void tearDown() {
+    IntegrationTestUtil.tearDown();
+  }
+
+  private final Map<String, Map<String, Object>> bookDocs =
+      mapOfEntries(
+          entry(
+              "book1",
+              mapOfEntries(
+                  entry("title", "The Hitchhiker's Guide to the Galaxy"),
+                  entry("author", "Douglas Adams"),
+                  entry("genre", "Science Fiction"),
+                  entry("published", 1979),
+                  entry("rating", 4.2),
+                  entry("tags", ImmutableList.of("comedy", "space", "adventure")),
+                  entry("awards", ImmutableMap.of("hugo", true, "nebula", false)),
+                  entry(
+                      "nestedField",
+                      ImmutableMap.of("level.1", ImmutableMap.of("level.2", true))))),
+          entry(
+              "book2",
+              mapOfEntries(
+                  entry("title", "Pride and Prejudice"),
+                  entry("author", "Jane Austen"),
+                  entry("genre", "Romance"),
+                  entry("published", 1813),
+                  entry("rating", 4.5),
+                  entry("tags", ImmutableList.of("classic", "social commentary", "love")),
+                  entry("awards", ImmutableMap.of("none", true)))),
+          entry(
+              "book3",
+              mapOfEntries(
+                  entry("title", "One Hundred Years of Solitude"),
+                  entry("author", "Gabriel García Márquez"),
+                  entry("genre", "Magical Realism"),
+                  entry("published", 1967),
+                  entry("rating", 4.3),
+                  entry("tags", ImmutableList.of("family", "history", "fantasy")),
+                  entry("awards", ImmutableMap.of("nobel", true, "nebula", false)))),
+          entry(
+              "book4",
+              mapOfEntries(
+                  entry("title", "The Lord of the Rings"),
+                  entry("author", "J.R.R. Tolkien"),
+                  entry("genre", "Fantasy"),
+                  entry("published", 1954),
+                  entry("rating", 4.7),
+                  entry("tags", ImmutableList.of("adventure", "magic", "epic")),
+                  entry("awards", ImmutableMap.of("hugo", false, "nebula", false)))),
+          entry(
+              "book5",
+              mapOfEntries(
+                  entry("title", "The Handmaid's Tale"),
+                  entry("author", "Margaret Atwood"),
+                  entry("genre", "Dystopian"),
+                  entry("published", 1985),
+                  entry("rating", 4.1),
+                  entry("tags", ImmutableList.of("feminism", "totalitarianism", "resistance")),
+                  entry(
+                      "awards", ImmutableMap.of("arthur c. clarke", true, "booker prize", false)))),
+          entry(
+              "book6",
+              mapOfEntries(
+                  entry("title", "Crime and Punishment"),
+                  entry("author", "Fyodor Dostoevsky"),
+                  entry("genre", "Psychological Thriller"),
+                  entry("published", 1866),
+                  entry("rating", 4.3),
+                  entry("tags", ImmutableList.of("philosophy", "crime", "redemption")),
+                  entry("awards", ImmutableMap.of("none", true)))),
+          entry(
+              "book7",
+              mapOfEntries(
+                  entry("title", "To Kill a Mockingbird"),
+                  entry("author", "Harper Lee"),
+                  entry("genre", "Southern Gothic"),
+                  entry("published", 1960),
+                  entry("rating", 4.2),
+                  entry("tags", ImmutableList.of("racism", "injustice", "coming-of-age")),
+                  entry("awards", ImmutableMap.of("pulitzer", true)))),
+          entry(
+              "book8",
+              mapOfEntries(
+                  entry("title", "1984"),
+                  entry("author", "George Orwell"),
+                  entry("genre", "Dystopian"),
+                  entry("published", 1949),
+                  entry("rating", 4.2),
+                  entry("tags", ImmutableList.of("surveillance", "totalitarianism", "propaganda")),
+                  entry("awards", ImmutableMap.of("prometheus", true)))),
+          entry(
+              "book9",
+              mapOfEntries(
+                  entry("title", "The Great Gatsby"),
+                  entry("author", "F. Scott Fitzgerald"),
+                  entry("genre", "Modernist"),
+                  entry("published", 1925),
+                  entry("rating", 4.0),
+                  entry("tags", ImmutableList.of("wealth", "american dream", "love")),
+                  entry("awards", ImmutableMap.of("none", true)))),
+          entry(
+              "book10",
+              mapOfEntries(
+                  entry("title", "Dune"),
+                  entry("author", "Frank Herbert"),
+                  entry("genre", "Science Fiction"),
+                  entry("published", 1965),
+                  entry("rating", 4.6),
+                  entry("tags", ImmutableList.of("politics", "desert", "ecology")),
+                  entry("awards", ImmutableMap.of("hugo", true, "nebula", true)))));
+
+  @Before
+  public void setup() {
+    randomCol = IntegrationTestUtil.testCollectionWithDocs(bookDocs);
+    firestore = randomCol.firestore;
+  }
+
+  @Test
+  public void emptyResults() {
+    Task<PipelineSnapshot> execute =
+        firestore.pipeline().collection(randomCol.getPath()).limit(0).execute();
+    assertThat(waitFor(execute).getResults()).isEmpty();
+  }
+
+  @Test
+  public void fullResults() {
+    Task<PipelineSnapshot> execute = firestore.pipeline().collection(randomCol.getPath()).execute();
+    assertThat(waitFor(execute).getResults()).hasSize(10);
+  }
+
+  @Test
+  public void aggregateResultsCountAll() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .aggregate(AggregateFunction.countAll().alias("count"))
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(ImmutableMap.of("count", 10));
+  }
+
+  @Test
+  @Ignore("Not supported yet")
+  public void aggregateResultsMany() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(eq("genre", "Science Fiction"))
+            .aggregate(
+                AggregateFunction.countAll().alias("count"),
+                AggregateFunction.avg("rating").alias("avgRating"),
+                field("rating").maximum().alias("maxRating"))
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            mapOfEntries(entry("count", 10), entry("avgRating", 4.4), entry("maxRating", 4.6)));
+  }
+
+  @Test
+  public void groupAndAccumulateResults() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(lt(field("published"), 1984))
+            .aggregate(
+                AggregateStage.withAccumulators(AggregateFunction.avg("rating").alias("avgRating"))
+                    .withGroups("genre"))
+            .where(gt("avgRating", 4.3))
+            .sort(field("avgRating").descending())
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            mapOfEntries(entry("avgRating", 4.7), entry("genre", "Fantasy")),
+            mapOfEntries(entry("avgRating", 4.5), entry("genre", "Romance")),
+            mapOfEntries(entry("avgRating", 4.4), entry("genre", "Science Fiction")));
+  }
+
+  @Test
+  public void groupAndAccumulateResultsGeneric() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .addStage(Stage.ofName("where").withArguments(lt(field("published"), 1984)))
+            .addStage(
+                Stage.ofName("aggregate")
+                    .withArguments(
+                        ImmutableMap.of("avgRating", AggregateFunction.avg("rating")),
+                        ImmutableMap.of("genre", field("genre"))))
+            .addStage(Stage.ofName("where").withArguments(gt("avgRating", 4.3)))
+            .addStage(
+                Stage.ofName("sort").withArguments(field("avgRating").descending()))
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            mapOfEntries(entry("avgRating", 4.7), entry("genre", "Fantasy")),
+            mapOfEntries(entry("avgRating", 4.5), entry("genre", "Romance")),
+            mapOfEntries(entry("avgRating", 4.4), entry("genre", "Science Fiction")));
+  }
+
+  @Test
+  @Ignore("Not supported yet")
+  public void minAndMaxAccumulations() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .aggregate(
+                AggregateFunction.countAll().alias("count"),
+                field("rating").maximum().alias("maxRating"),
+                field("published").minimum().alias("minPublished"))
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            mapOfEntries(entry("count", 10), entry("maxRating", 4.7), entry("minPublished", 1813)));
+  }
+
+  @Test
+  public void canSelectFields() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .select("title", "author")
+            .sort(field("author").ascending())
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            mapOfEntries(
+                entry("title", "The Hitchhiker's Guide to the Galaxy"),
+                entry("author", "Douglas Adams")),
+            mapOfEntries(
+                entry("title", "The Great Gatsby"), entry("author", "F. Scott Fitzgerald")),
+            mapOfEntries(entry("title", "Dune"), entry("author", "Frank Herbert")),
+            mapOfEntries(
+                entry("title", "Crime and Punishment"), entry("author", "Fyodor Dostoevsky")),
+            mapOfEntries(
+                entry("title", "One Hundred Years of Solitude"),
+                entry("author", "Gabriel García Márquez")),
+            mapOfEntries(entry("title", "1984"), entry("author", "George Orwell")),
+            mapOfEntries(entry("title", "To Kill a Mockingbird"), entry("author", "Harper Lee")),
+            mapOfEntries(
+                entry("title", "The Lord of the Rings"), entry("author", "J.R.R. Tolkien")),
+            mapOfEntries(entry("title", "Pride and Prejudice"), entry("author", "Jane Austen")),
+            mapOfEntries(entry("title", "The Handmaid's Tale"), entry("author", "Margaret Atwood")))
+        .inOrder();
+  }
+
+  @Test
+  public void whereWithAnd() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(and(gt("rating", 4.5), eq("genre", "Science Fiction")))
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(ID_CORRESPONDENCE)
+        .containsExactly("book10");
+  }
+
+  @Test
+  public void whereWithOr() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(or(eq("genre", "Romance"), eq("genre", "Dystopian")))
+            .select("title")
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            ImmutableMap.of("title", "Pride and Prejudice"),
+            ImmutableMap.of("title", "The Handmaid's Tale"),
+            ImmutableMap.of("title", "1984"));
+  }
+
+  @Test
+  public void offsetAndLimits() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .sort(ascending("author"))
+            .offset(5)
+            .limit(3)
+            .select("title", "author")
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            mapOfEntries(entry("title", "1984"), entry("author", "George Orwell")),
+            mapOfEntries(entry("title", "To Kill a Mockingbird"), entry("author", "Harper Lee")),
+            mapOfEntries(
+                entry("title", "The Lord of the Rings"), entry("author", "J.R.R. Tolkien")));
+  }
+
+  @Test
+  public void arrayContainsWorks() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(arrayContains("tags", "comedy"))
+            .select("title")
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(ImmutableMap.of("title", "The Hitchhiker's Guide to the Galaxy"));
+  }
+
+  @Test
+  public void arrayContainsAnyWorks() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(arrayContainsAny("tags", ImmutableList.of("comedy", "classic")))
+            .select("title")
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            ImmutableMap.of("title", "The Hitchhiker's Guide to the Galaxy"),
+            ImmutableMap.of("title", "Pride and Prejudice"));
+  }
+
+  @Test
+  public void arrayContainsAllWorks() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(field("tags").arrayContainsAll(ImmutableList.of("adventure", "magic")))
+            .select("title")
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(ImmutableMap.of("title", "The Lord of the Rings"));
+  }
+
+  @Test
+  public void arrayLengthWorks() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .select(field("tags").arrayLength().alias("tagsCount"))
+            .where(eq("tagsCount", 3))
+            .execute();
+    assertThat(waitFor(execute).getResults()).hasSize(10);
+  }
+
+  @Test
+  @Ignore("Not supported yet")
+  public void arrayConcatWorks() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(eq("title", "The Hitchhiker's Guide to the Galaxy"))
+            .select(
+                field("tags")
+                    .arrayConcat(ImmutableList.of("newTag1", "newTag2"))
+                    .alias("modifiedTags"))
+            .limit(1)
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            ImmutableMap.of(
+                "modifiedTags",
+                ImmutableList.of("comedy", "space", "adventure", "newTag1", "newTag2")));
+  }
+
+  @Test
+  public void testStrConcat() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .select(field("author").strConcat(" - ", field("title")).alias("bookInfo"))
+            .limit(1)
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            ImmutableMap.of("bookInfo", "Douglas Adams - The Hitchhiker's Guide to the Galaxy"));
+  }
+
+  @Test
+  public void testStartsWith() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(startsWith("title", "The"))
+            .select("title")
+            .sort(field("title").ascending())
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            ImmutableMap.of("title", "The Great Gatsby"),
+            ImmutableMap.of("title", "The Handmaid's Tale"),
+            ImmutableMap.of("title", "The Hitchhiker's Guide to the Galaxy"),
+            ImmutableMap.of("title", "The Lord of the Rings"));
+  }
+
+  @Test
+  public void testEndsWith() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(endsWith("title", "y"))
+            .select("title")
+            .sort(field("title").descending())
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            ImmutableMap.of("title", "The Hitchhiker's Guide to the Galaxy"),
+            ImmutableMap.of("title", "The Great Gatsby"));
+  }
+
+  @Test
+  public void testLength() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .select(field("title").charLength().alias("titleLength"), field("title"))
+            .where(gt("titleLength", 20))
+            .sort(field("title").ascending())
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            ImmutableMap.of("titleLength", 29, "title", "One Hundred Years of Solitude"),
+            ImmutableMap.of("titleLength", 36, "title", "The Hitchhiker's Guide to the Galaxy"),
+            ImmutableMap.of("titleLength", 21, "title", "The Lord of the Rings"),
+            ImmutableMap.of("titleLength", 21, "title", "To Kill a Mockingbird"));
+  }
+
+  @Test
+  @Ignore("Not supported yet")
+  public void testToLowercase() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .select(field("title").toLower().alias("lowercaseTitle"))
+            .limit(1)
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(ImmutableMap.of("lowercaseTitle", "the hitchhiker's guide to the galaxy"));
+  }
+
+  @Test
+  @Ignore("Not supported yet")
+  public void testToUppercase() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .select(field("author").toLower().alias("uppercaseAuthor"))
+            .limit(1)
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(ImmutableMap.of("uppercaseAuthor", "DOUGLAS ADAMS"));
+  }
+
+  @Test
+  @Ignore("Not supported yet")
+  public void testTrim() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .addFields(strConcat(" ", field("title"), " ").alias("spacedTitle"))
+            .select(field("spacedTitle").trim().alias("trimmedTitle"))
+            .limit(1)
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            ImmutableMap.of(
+                "spacedTitle",
+                " The Hitchhiker's Guide to the Galaxy ",
+                "trimmedTitle",
+                "The Hitchhiker's Guide to the Galaxy"));
+  }
+
+  @Test
+  public void testLike() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(Expr.like("title", "%Guide%"))
+            .select("title")
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(ImmutableMap.of("title", "The Hitchhiker's Guide to the Galaxy"));
+  }
+
+  @Test
+  public void testRegexContains() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(Expr.regexContains("title", "(?i)(the|of)"))
+            .execute();
+    assertThat(waitFor(execute).getResults()).hasSize(5);
+  }
+
+  @Test
+  public void testRegexMatches() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(Expr.regexContains("title", ".*(?i)(the|of).*"))
+            .execute();
+    assertThat(waitFor(execute).getResults()).hasSize(5);
+  }
+
+  @Test
+  public void testArithmeticOperations() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .select(
+                add(field("rating"), 1).alias("ratingPlusOne"),
+                subtract(field("published"), 1900).alias("yearsSince1900"),
+                field("rating").multiply(10).alias("ratingTimesTen"),
+                field("rating").divide(2).alias("ratingDividedByTwo"))
+            .limit(1)
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            mapOfEntries(
+                entry("ratingPlusOne", 5.2),
+                entry("yearsSince1900", 79),
+                entry("ratingTimesTen", 42),
+                entry("ratingDividedByTwo", 2.1)));
+  }
+
+  @Test
+  public void testComparisonOperators() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(
+                and(gt("rating", 4.2), lte(field("rating"), 4.5), neq("genre", "Science Function")))
+            .select("rating", "title")
+            .sort(field("title").ascending())
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            ImmutableMap.of("rating", 4.3, "title", "Crime and Punishment"),
+            ImmutableMap.of("rating", 4.3, "title", "One Hundred Years of Solitude"),
+            ImmutableMap.of("rating", 4.5, "title", "Pride and Prejudice"));
+  }
+
+  @Test
+  public void testLogicalOperators() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(
+                or(
+                    and(gt("rating", 4.5), eq("genre", "Science Fiction")),
+                    lt(field("published"), 1900)))
+            .select("title")
+            .sort(field("title").ascending())
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            ImmutableMap.of("title", "Crime and Punishment"),
+            ImmutableMap.of("title", "Dune"),
+            ImmutableMap.of("title", "Pride and Prejudice"));
+  }
+
+  @Test
+  public void testChecks() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(not(field("rating").isNan()))
+            .select(
+                field("rating").isNull().alias("ratingIsNull"),
+                field("rating").eq(Expr.nullValue()).alias("ratingEqNull"),
+                not(field("rating").isNan()).alias("ratingIsNotNan"))
+            .limit(1)
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            mapOfEntries(
+                entry("ratingIsNull", false),
+                entry("ratingEqNull", null),
+                entry("ratingIsNotNan", true)));
+  }
+
+  @Test
+  @Ignore("Not supported yet")
+  public void testLogicalMax() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(field("author").eq("Douglas Adams"))
+            .select(
+                field("rating").logicalMaximum(4.5).alias("max_rating"),
+                logicalMaximum(field("published"), 1900).alias("max_published"))
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(ImmutableMap.of("max_rating", 4.5, "max_published", 1979));
+  }
+
+  @Test
+  @Ignore("Not supported yet")
+  public void testLogicalMin() {
+    Task<PipelineSnapshot> execute =
+        firestore.pipeline().collection(randomCol).sort(field("rating").ascending()).execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(ImmutableMap.of("min_rating", 4.2, "min_published", 1900));
+  }
+
+  @Test
+  public void testMapGet() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .select(field("awards").mapGet("hugo").alias("hugoAward"), field("title"))
+            .where(eq("hugoAward", true))
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            ImmutableMap.of("hugoAward", true, "title", "The Hitchhiker's Guide to the Galaxy"),
+            ImmutableMap.of("hugoAward", true, "title", "Dune"));
+  }
+
+  @Test
+  public void testDistanceFunctions() {
+    double[] sourceVector = {0.1, 0.1};
+    double[] targetVector = {0.5, 0.8};
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .select(
+                cosineDistance(vector(sourceVector), targetVector).alias("cosineDistance"),
+                Expr.dotProduct(vector(sourceVector), targetVector).alias("dotProductDistance"),
+                euclideanDistance(vector(sourceVector), targetVector).alias("euclideanDistance"))
+            .limit(1)
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            ImmutableMap.of(
+                "cosineDistance", 0.02560880430538015,
+                "dotProductDistance", 0.13,
+                "euclideanDistance", 0.806225774829855));
+  }
+
+  @Test
+  public void testNestedFields() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(eq("awards.hugo", true))
+            .select("title", "awards.hugo")
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            ImmutableMap.of("title", "The Hitchhiker's Guide to the Galaxy", "awards.hugo", true),
+            ImmutableMap.of("title", "Dune", "awards.hugo", true));
+  }
+
+  @Test
+  public void testMapGetWithFieldNameIncludingNotation() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(eq("awards.hugo", true))
+            .select(
+                "title",
+                field("nestedField.level.1"),
+                mapGet("nestedField", "level.1").mapGet("level.2").alias("nested"))
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(DATA_CORRESPONDENCE)
+        .containsExactly(
+            mapOfEntries(
+                entry("title", "The Hitchhiker's Guide to the Galaxy"),
+                entry("nestedField.level.`1`", null),
+                entry("nested", true)),
+            mapOfEntries(
+                entry("title", "Dune"),
+                entry("nestedField.level.`1`", null),
+                entry("nested", null)));
+  }
+
+  @Test
+  public void testListEquals() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(eq("tags", ImmutableList.of("philosophy", "crime", "redemption")))
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(ID_CORRESPONDENCE)
+        .containsExactly("book6");
+  }
+
+  @Test
+  public void testMapEquals() {
+    Task<PipelineSnapshot> execute =
+        firestore
+            .pipeline()
+            .collection(randomCol)
+            .where(eq("awards", ImmutableMap.of("nobel", true, "nebula", false)))
+            .execute();
+    assertThat(waitFor(execute).getResults())
+        .comparingElementsUsing(ID_CORRESPONDENCE)
+        .containsExactly("book3");
+  }
+
+  static <T> Map.Entry<String, T> entry(String key, T value) {
+    return new Map.Entry<String, T>() {
+      private String k = key;
+      private T v = value;
+
+      @Override
+      public String getKey() {
+        return k;
+      }
+
+      @Override
+      public T getValue() {
+        return v;
+      }
+
+      @Override
+      public T setValue(T value) {
+        T old = v;
+        v = value;
+        return old;
+      }
+
+      @Override
+      public boolean equals(Object o) {
+        if (!(o instanceof Map.Entry)) {
+          return false;
+        }
+
+        Map.Entry<?, ?> that = (Map.Entry<?, ?>) o;
+        return com.google.common.base.Objects.equal(k, that.getKey())
+            && com.google.common.base.Objects.equal(v, that.getValue());
+      }
+
+      @Override
+      public int hashCode() {
+        return com.google.common.base.Objects.hashCode(k, v);
+      }
+    };
+  }
+
+  @SafeVarargs
+  static <T> Map<String, T> mapOfEntries(Map.Entry<String, T>... entries) {
+    Map<String, T> res = new LinkedHashMap<>();
+    for (Map.Entry<String, T> entry : entries) {
+      res.put(entry.getKey(), entry.getValue());
+    }
+    return Collections.unmodifiableMap(res);
+  }
+}
diff --git a/firebase-firestore/src/androidTest/java/com/google/firebase/firestore/QueryToPipelineTest.java b/firebase-firestore/src/androidTest/java/com/google/firebase/firestore/QueryToPipelineTest.java
new file mode 100644
index 00000000000..942d6291668
--- /dev/null
+++ b/firebase-firestore/src/androidTest/java/com/google/firebase/firestore/QueryToPipelineTest.java
@@ -0,0 +1,952 @@
+// Copyright 2018 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.firebase.firestore;
+
+import static com.google.common.io.Files.map;
+import static com.google.firebase.firestore.Filter.and;
+import static com.google.firebase.firestore.Filter.arrayContains;
+import static com.google.firebase.firestore.Filter.arrayContainsAny;
+import static com.google.firebase.firestore.Filter.equalTo;
+import static com.google.firebase.firestore.Filter.inArray;
+import static com.google.firebase.firestore.Filter.or;
+import static com.google.firebase.firestore.testutil.IntegrationTestUtil.checkQueryAndPipelineResultsMatch;
+import static com.google.firebase.firestore.testutil.IntegrationTestUtil.nullList;
+import static com.google.firebase.firestore.testutil.IntegrationTestUtil.pipelineSnapshotToIds;
+import static com.google.firebase.firestore.testutil.IntegrationTestUtil.pipelineSnapshotToValues;
+import static com.google.firebase.firestore.testutil.IntegrationTestUtil.testCollection;
+import static com.google.firebase.firestore.testutil.IntegrationTestUtil.testCollectionWithDocs;
+import static com.google.firebase.firestore.testutil.IntegrationTestUtil.testFirestore;
+import static com.google.firebase.firestore.testutil.IntegrationTestUtil.waitFor;
+import static com.google.firebase.firestore.testutil.TestUtil.expectError;
+import static com.google.firebase.firestore.testutil.TestUtil.map;
+import static java.util.Arrays.asList;
+import static java.util.Collections.singletonList;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import com.google.android.gms.tasks.Task;
+import com.google.common.collect.Lists;
+import com.google.firebase.firestore.Query.Direction;
+import com.google.firebase.firestore.testutil.IntegrationTestUtil;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import org.junit.After;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public class QueryToPipelineTest {
+
+  @After
+  public void tearDown() {
+    IntegrationTestUtil.tearDown();
+  }
+
+  @Test
+  public void testLimitQueries() {
+    CollectionReference collection =
+        testCollectionWithDocs(
+            map(
+                "a", map("k", "a"),
+                "b", map("k", "b"),
+                "c", map("k", "c")));
+
+    Query query = collection.limit(2);
+    FirebaseFirestore db = collection.firestore;
+    PipelineSnapshot set = waitFor(db.pipeline().convertFrom(query).execute());
+    List<Map<String, Object>> data = pipelineSnapshotToValues(set);
+    assertEquals(asList(map("k", "a"), map("k", "b")), data);
+  }
+
+  @Test
+  public void testLimitQueriesUsingDescendingSortOrder() {
+    CollectionReference collection =
+        testCollectionWithDocs(
+            map(
+                "a", map("k", "a", "sort", 0),
+                "b", map("k", "b", "sort", 1),
+                "c", map("k", "c", "sort", 1),
+                "d", map("k", "d", "sort", 2)));
+
+    Query query = collection.limit(2).orderBy("sort", Direction.DESCENDING);
+    FirebaseFirestore db = collection.firestore;
+    PipelineSnapshot set = waitFor(db.pipeline().convertFrom(query).execute());
+
+    List<Map<String, Object>> data = pipelineSnapshotToValues(set);
+    assertEquals(asList(map("k", "d", "sort", 2L), map("k", "c", "sort", 1L)), data);
+  }
+
+  @Test
+  public void testLimitToLastMustAlsoHaveExplicitOrderBy() {
+    CollectionReference collection = testCollectionWithDocs(map());
+    FirebaseFirestore db = collection.firestore;
+
+    Query query = collection.limitToLast(2);
+    expectError(
+        () -> waitFor(db.pipeline().convertFrom(query).execute()),
+        "limitToLast() queries require specifying at least one orderBy() clause");
+  }
+
+  @Test
+  public void testLimitToLastQueriesWithCursors() {
+    CollectionReference collection =
+        testCollectionWithDocs(
+            map(
+                "a", map("k", "a", "sort", 0),
+                "b", map("k", "b", "sort", 1),
+                "c", map("k", "c", "sort", 1),
+                "d", map("k", "d", "sort", 2)));
+
+    Query query = collection.limitToLast(3).orderBy("sort").endBefore(2);
+    FirebaseFirestore db = collection.firestore;
+
+    PipelineSnapshot set = waitFor(db.pipeline().convertFrom(query).execute());
+    List<Map<String, Object>> data = pipelineSnapshotToValues(set);
+    assertEquals(
+        asList(map("k", "a", "sort", 0L), map("k", "b", "sort", 1L), map("k", "c", "sort", 1L)),
+        data);
+
+    query = collection.limitToLast(3).orderBy("sort").endAt(1);
+    set = waitFor(db.pipeline().convertFrom(query).execute());
+    data = pipelineSnapshotToValues(set);
+    assertEquals(
+        asList(map("k", "a", "sort", 0L), map("k", "b", "sort", 1L), map("k", "c", "sort", 1L)),
+        data);
+
+    query = collection.limitToLast(3).orderBy("sort").startAt(2);
+    set = waitFor(db.pipeline().convertFrom(query).execute());
+    data = pipelineSnapshotToValues(set);
+    assertEquals(asList(map("k", "d", "sort", 2L)), data);
+
+    query = collection.limitToLast(3).orderBy("sort").startAfter(0);
+    set = waitFor(db.pipeline().convertFrom(query).execute());
+    data = pipelineSnapshotToValues(set);
+    assertEquals(
+        asList(map("k", "b", "sort", 1L), map("k", "c", "sort", 1L), map("k", "d", "sort", 2L)),
+        data);
+
+    query = collection.limitToLast(3).orderBy("sort").startAfter(-1);
+    set = waitFor(db.pipeline().convertFrom(query).execute());
+    data = pipelineSnapshotToValues(set);
+    assertEquals(
+        asList(map("k", "b", "sort", 1L), map("k", "c", "sort", 1L), map("k", "d", "sort", 2L)),
+        data);
+  }
+
+  @Test
+  public void testKeyOrderIsDescendingForDescendingInequality() {
+    CollectionReference collection =
+        testCollectionWithDocs(
+            map(
+                "a", map("foo", 42),
+                "b", map("foo", 42.0),
+                "c", map("foo", 42),
+                "d", map("foo", 21),
+                "e", map("foo", 21.0),
+                "f", map("foo", 66),
+                "g", map("foo", 66.0)));
+
+    Query query = collection.whereGreaterThan("foo", 21.0).orderBy("foo", Direction.DESCENDING);
+    FirebaseFirestore db = collection.firestore;
+    PipelineSnapshot result = waitFor(db.pipeline().convertFrom(query).execute());
+    assertEquals(asList("g", "f", "c", "b", "a"), pipelineSnapshotToIds(result));
+  }
+
+  @Test
+  public void testUnaryFilterQueries() {
+    CollectionReference collection =
+        testCollectionWithDocs(
+            map(
+                "a", map("null", null, "nan", Double.NaN),
+                "b", map("null", null, "nan", 0),
+                "c", map("null", false, "nan", Double.NaN)));
+    FirebaseFirestore db = collection.firestore;
+    PipelineSnapshot results =
+        waitFor(
+            db.pipeline()
+                .convertFrom(collection.whereEqualTo("null", null).whereEqualTo("nan", Double.NaN))
+                .execute());
+    assertEquals(1, results.getResults().size());
+    PipelineResult result = results.getResults().get(0);
+    // Can't use assertEquals() since NaN != NaN.
+    assertEquals(null, result.get("null"));
+    assertTrue(((Double) result.get("nan")).isNaN());
+  }
+
+  @Test
+  public void testFilterOnInfinity() {
+    CollectionReference collection =
+        testCollectionWithDocs(
+            map(
+                "a", map("inf", Double.POSITIVE_INFINITY),
+                "b", map("inf", Double.NEGATIVE_INFINITY)));
+    FirebaseFirestore db = collection.firestore;
+    PipelineSnapshot results =
+        waitFor(
+            db.pipeline()
+                .convertFrom(collection.whereEqualTo("inf", Double.POSITIVE_INFINITY))
+                .execute());
+    assertEquals(1, results.getResults().size());
+    assertEquals(asList(map("inf", Double.POSITIVE_INFINITY)), pipelineSnapshotToValues(results));
+  }
+
+  @Test
+  public void testCanExplicitlySortByDocumentId() {
+    Map<String, Map<String, Object>> testDocs =
+        map(
+            "a", map("key", "a"),
+            "b", map("key", "b"),
+            "c", map("key", "c"));
+    CollectionReference collection = testCollectionWithDocs(testDocs);
+    FirebaseFirestore db = collection.firestore;
+    // Ideally this would be descending to validate it's different than
+    // the default, but that requires an extra index
+    PipelineSnapshot docs =
+        waitFor(db.pipeline().convertFrom(collection.orderBy(FieldPath.documentId())).execute());
+    assertEquals(
+        asList(testDocs.get("a"), testDocs.get("b"), testDocs.get("c")),
+        pipelineSnapshotToValues(docs));
+  }
+
+  @Test
+  public void testCanQueryByDocumentId() {
+    Map<String, Map<String, Object>> testDocs =
+        map(
+            "aa", map("key", "aa"),
+            "ab", map("key", "ab"),
+            "ba", map("key", "ba"),
+            "bb", map("key", "bb"));
+    CollectionReference collection = testCollectionWithDocs(testDocs);
+    FirebaseFirestore db = collection.firestore;
+    PipelineSnapshot docs =
+        waitFor(
+            db.pipeline()
+                .convertFrom(collection.whereEqualTo(FieldPath.documentId(), "ab"))
+                .execute());
+    assertEquals(singletonList(testDocs.get("ab")), pipelineSnapshotToValues(docs));
+
+    docs =
+        waitFor(
+            db.pipeline()
+                .convertFrom(
+                    collection
+                        .whereGreaterThan(FieldPath.documentId(), "aa")
+                        .whereLessThanOrEqualTo(FieldPath.documentId(), "ba"))
+                .execute());
+    assertEquals(asList(testDocs.get("ab"), testDocs.get("ba")), pipelineSnapshotToValues(docs));
+  }
+
+  @Test
+  public void testCanQueryByDocumentIdUsingRefs() {
+    Map<String, Map<String, Object>> testDocs =
+        map(
+            "aa", map("key", "aa"),
+            "ab", map("key", "ab"),
+            "ba", map("key", "ba"),
+            "bb", map("key", "bb"));
+    CollectionReference collection = testCollectionWithDocs(testDocs);
+    FirebaseFirestore db = collection.firestore;
+    PipelineSnapshot docs =
+        waitFor(
+            db.pipeline()
+                .convertFrom(
+                    collection.whereEqualTo(FieldPath.documentId(), collection.document("ab")))
+                .execute());
+    assertEquals(singletonList(testDocs.get("ab")), pipelineSnapshotToValues(docs));
+
+    docs =
+        waitFor(
+            db.pipeline()
+                .convertFrom(
+                    collection
+                        .whereGreaterThan(FieldPath.documentId(), collection.document("aa"))
+                        .whereLessThanOrEqualTo(FieldPath.documentId(), collection.document("ba")))
+                .execute());
+    assertEquals(asList(testDocs.get("ab"), testDocs.get("ba")), pipelineSnapshotToValues(docs));
+  }
+
+  @Test
+  public void testCanQueryWithAndWithoutDocumentKey() {
+    CollectionReference collection = testCollection();
+    FirebaseFirestore db = collection.firestore;
+    collection.add(map());
+    Task<PipelineSnapshot> query1 =
+        db.pipeline()
+            .convertFrom(collection.orderBy(FieldPath.documentId(), Direction.ASCENDING))
+            .execute();
+    Task<PipelineSnapshot> query2 = db.pipeline().convertFrom(collection).execute();
+
+    waitFor(query1);
+    waitFor(query2);
+
+    assertEquals(
+        pipelineSnapshotToValues(query1.getResult()), pipelineSnapshotToValues(query2.getResult()));
+  }
+
+  @Test
+  public void testQueriesCanUseNotEqualFilters() {
+    // These documents are ordered by value in "zip" since the notEquals filter is an inequality,
+    // which results in documents being sorted by value.
+    Map<String, Object> docA = map("zip", Double.NaN);
+    Map<String, Object> docB = map("zip", 91102L);
+    Map<String, Object> docC = map("zip", 98101L);
+    Map<String, Object> docD = map("zip", "98101");
+    Map<String, Object> docE = map("zip", asList(98101L));
+    Map<String, Object> docF = map("zip", asList(98101L, 98102L));
+    Map<String, Object> docG = map("zip", asList("98101", map("zip", 98101L)));
+    Map<String, Object> docH = map("zip", map("code", 500L));
+    Map<String, Object> docI = map("code", 500L);
+    Map<String, Object> docJ = map("zip", null);
+
+    Map<String, Map<String, Object>> allDocs =
+        map(
+            "a", docA, "b", docB, "c", docC, "d", docD, "e", docE, "f", docF, "g", docG, "h", docH,
+            "i", docI, "j", docJ);
+    CollectionReference collection = testCollectionWithDocs(allDocs);
+    FirebaseFirestore db = collection.firestore;
+
+    // Search for zips not matching 98101.
+    Map<String, Map<String, Object>> expectedDocsMap = new LinkedHashMap<>(allDocs);
+    expectedDocsMap.remove("c");
+    expectedDocsMap.remove("i");
+    expectedDocsMap.remove("j");
+
+    PipelineSnapshot snapshot =
+        waitFor(db.pipeline().convertFrom(collection.whereNotEqualTo("zip", 98101L)).execute());
+    assertEquals(Lists.newArrayList(expectedDocsMap.values()), pipelineSnapshotToValues(snapshot));
+
+    // With objects.
+    expectedDocsMap = new LinkedHashMap<>(allDocs);
+    expectedDocsMap.remove("h");
+    expectedDocsMap.remove("i");
+    expectedDocsMap.remove("j");
+    snapshot =
+        waitFor(
+            db.pipeline()
+                .convertFrom(collection.whereNotEqualTo("zip", map("code", 500)))
+                .execute());
+    assertEquals(Lists.newArrayList(expectedDocsMap.values()), pipelineSnapshotToValues(snapshot));
+
+    // With Null.
+    expectedDocsMap = new LinkedHashMap<>(allDocs);
+    expectedDocsMap.remove("i");
+    expectedDocsMap.remove("j");
+    snapshot =
+        waitFor(db.pipeline().convertFrom(collection.whereNotEqualTo("zip", null)).execute());
+    assertEquals(Lists.newArrayList(expectedDocsMap.values()), pipelineSnapshotToValues(snapshot));
+
+    // With NaN.
+    expectedDocsMap = new LinkedHashMap<>(allDocs);
+    expectedDocsMap.remove("a");
+    expectedDocsMap.remove("i");
+    expectedDocsMap.remove("j");
+    snapshot =
+        waitFor(db.pipeline().convertFrom(collection.whereNotEqualTo("zip", Double.NaN)).execute());
+    assertEquals(Lists.newArrayList(expectedDocsMap.values()), pipelineSnapshotToValues(snapshot));
+  }
+
+  @Test
+  public void testQueriesCanUseNotEqualFiltersWithDocIds() {
+    Map<String, String> docA = map("key", "aa");
+    Map<String, String> docB = map("key", "ab");
+    Map<String, String> docC = map("key", "ba");
+    Map<String, String> docD = map("key", "bb");
+    Map<String, Map<String, Object>> testDocs =
+        map(
+            "aa", docA,
+            "ab", docB,
+            "ba", docC,
+            "bb", docD);
+    CollectionReference collection = testCollectionWithDocs(testDocs);
+    FirebaseFirestore db = collection.firestore;
+    PipelineSnapshot docs =
+        waitFor(
+            db.pipeline()
+                .convertFrom(collection.whereNotEqualTo(FieldPath.documentId(), "aa"))
+                .execute());
+    assertEquals(asList(docB, docC, docD), pipelineSnapshotToValues(docs));
+  }
+
+  @Test
+  public void testQueriesCanUseArrayContainsFilters() {
+    Map<String, Object> docA = map("array", asList(42L));
+    Map<String, Object> docB = map("array", asList("a", 42L, "c"));
+    Map<String, Object> docC = map("array", asList(41.999, "42", map("a", asList(42))));
+    Map<String, Object> docD = map("array", asList(42L), "array2", asList("bingo"));
+    Map<String, Object> docE = map("array", nullList());
+    Map<String, Object> docF = map("array", asList(Double.NaN));
+    CollectionReference collection =
+        testCollectionWithDocs(
+            map("a", docA, "b", docB, "c", docC, "d", docD, "e", docE, "f", docF));
+    FirebaseFirestore db = collection.firestore;
+
+    // Search for "array" to contain 42
+    PipelineSnapshot snapshot =
+        waitFor(db.pipeline().convertFrom(collection.whereArrayContains("array", 42L)).execute());
+    assertEquals(asList(docA, docB, docD), pipelineSnapshotToValues(snapshot));
+
+    // Note: whereArrayContains() requires a non-null value parameter, so no null test is needed.
+    // With NaN.
+    snapshot =
+        waitFor(
+            db.pipeline()
+                .convertFrom(collection.whereArrayContains("array", Double.NaN))
+                .execute());
+    assertEquals(new ArrayList<>(), pipelineSnapshotToValues(snapshot));
+  }
+
+  @Test
+  public void testQueriesCanUseInFilters() {
+    Map<String, Object> docA = map("zip", 98101L);
+    Map<String, Object> docB = map("zip", 91102L);
+    Map<String, Object> docC = map("zip", 98103L);
+    Map<String, Object> docD = map("zip", asList(98101L));
+    Map<String, Object> docE = map("zip", asList("98101", map("zip", 98101L)));
+    Map<String, Object> docF = map("zip", map("code", 500L));
+    Map<String, Object> docG = map("zip", asList(98101L, 98102L));
+    Map<String, Object> docH = map("zip", null);
+    Map<String, Object> docI = map("zip", Double.NaN);
+
+    CollectionReference collection =
+        testCollectionWithDocs(
+            map(
+                "a", docA, "b", docB, "c", docC, "d", docD, "e", docE, "f", docF, "g", docG, "h",
+                docH, "i", docI));
+    FirebaseFirestore db = collection.firestore;
+
+    // Search for zips matching 98101, 98103, or [98101, 98102].
+    PipelineSnapshot snapshot =
+        waitFor(
+            db.pipeline()
+                .convertFrom(
+                    collection.whereIn("zip", asList(98101L, 98103L, asList(98101L, 98102L))))
+                .execute());
+    assertEquals(asList(docA, docC, docG), pipelineSnapshotToValues(snapshot));
+
+    // With objects.
+    snapshot =
+        waitFor(
+            db.pipeline()
+                .convertFrom(collection.whereIn("zip", asList(map("code", 500L))))
+                .execute());
+    assertEquals(asList(docF), pipelineSnapshotToValues(snapshot));
+
+    // With null.
+    snapshot = waitFor(db.pipeline().convertFrom(collection.whereIn("zip", nullList())).execute());
+    assertEquals(new ArrayList<>(), pipelineSnapshotToValues(snapshot));
+
+    // With null and a value.
+    List<Object> inputList = nullList();
+    inputList.add(98101L);
+    snapshot = waitFor(db.pipeline().convertFrom(collection.whereIn("zip", inputList)).execute());
+    assertEquals(asList(docA), pipelineSnapshotToValues(snapshot));
+
+    // With NaN.
+    snapshot =
+        waitFor(db.pipeline().convertFrom(collection.whereIn("zip", asList(Double.NaN))).execute());
+    assertEquals(new ArrayList<>(), pipelineSnapshotToValues(snapshot));
+
+    // With NaN and a value.
+    snapshot =
+        waitFor(
+            db.pipeline()
+                .convertFrom(collection.whereIn("zip", asList(Double.NaN, 98101L)))
+                .execute());
+    assertEquals(asList(docA), pipelineSnapshotToValues(snapshot));
+  }
+
+  @Test
+  public void testQueriesCanUseInFiltersWithDocIds() {
+    Map<String, String> docA = map("key", "aa");
+    Map<String, String> docB = map("key", "ab");
+    Map<String, String> docC = map("key", "ba");
+    Map<String, String> docD = map("key", "bb");
+    Map<String, Map<String, Object>> testDocs =
+        map(
+            "aa", docA,
+            "ab", docB,
+            "ba", docC,
+            "bb", docD);
+    CollectionReference collection = testCollectionWithDocs(testDocs);
+    FirebaseFirestore db = collection.firestore;
+    PipelineSnapshot docs =
+        waitFor(
+            db.pipeline()
+                .convertFrom(collection.whereIn(FieldPath.documentId(), asList("aa", "ab")))
+                .execute());
+    assertEquals(asList(docA, docB), pipelineSnapshotToValues(docs));
+  }
+
+  @Test
+  public void testQueriesCanUseNotInFilters() {
+    // These documents are ordered by value in "zip" since the notEquals filter is an inequality,
+    // which results in documents being sorted by value.
+    Map<String, Object> docA = map("zip", Double.NaN);
+    Map<String, Object> docB = map("zip", 91102L);
+    Map<String, Object> docC = map("zip", 98101L);
+    Map<String, Object> docD = map("zip", 98103L);
+    Map<String, Object> docE = map("zip", asList(98101L));
+    Map<String, Object> docF = map("zip", asList(98101L, 98102L));
+    Map<String, Object> docG = map("zip", asList("98101", map("zip", 98101L)));
+    Map<String, Object> docH = map("zip", map("code", 500L));
+    Map<String, Object> docI = map("code", 500L);
+    Map<String, Object> docJ = map("zip", null);
+
+    Map<String, Map<String, Object>> allDocs =
+        map(
+            "a", docA, "b", docB, "c", docC, "d", docD, "e", docE, "f", docF, "g", docG, "h", docH,
+            "i", docI, "j", docJ);
+    CollectionReference collection = testCollectionWithDocs(allDocs);
+    FirebaseFirestore db = collection.firestore;
+
+    // Search for zips not matching 98101, 98103, or [98101, 98102].
+    Map<String, Map<String, Object>> expectedDocsMap = new LinkedHashMap<>(allDocs);
+    expectedDocsMap.remove("c");
+    expectedDocsMap.remove("d");
+    expectedDocsMap.remove("f");
+    expectedDocsMap.remove("i");
+    expectedDocsMap.remove("j");
+
+    PipelineSnapshot snapshot =
+        waitFor(
+            db.pipeline()
+                .convertFrom(
+                    collection.whereNotIn("zip", asList(98101L, 98103L, asList(98101L, 98102L))))
+                .execute());
+    assertEquals(Lists.newArrayList(expectedDocsMap.values()), pipelineSnapshotToValues(snapshot));
+
+    // With objects.
+    expectedDocsMap = new LinkedHashMap<>(allDocs);
+    expectedDocsMap.remove("h");
+    expectedDocsMap.remove("i");
+    expectedDocsMap.remove("j");
+    snapshot =
+        waitFor(
+            db.pipeline()
+                .convertFrom(collection.whereNotIn("zip", asList(map("code", 500L))))
+                .execute());
+    assertEquals(Lists.newArrayList(expectedDocsMap.values()), pipelineSnapshotToValues(snapshot));
+
+    // With Null.
+    snapshot =
+        waitFor(db.pipeline().convertFrom(collection.whereNotIn("zip", nullList())).execute());
+    assertEquals(new ArrayList<>(), pipelineSnapshotToValues(snapshot));
+
+    // With NaN.
+    expectedDocsMap = new LinkedHashMap<>(allDocs);
+    expectedDocsMap.remove("a");
+    expectedDocsMap.remove("i");
+    expectedDocsMap.remove("j");
+    snapshot =
+        waitFor(
+            db.pipeline().convertFrom(collection.whereNotIn("zip", asList(Double.NaN))).execute());
+    assertEquals(Lists.newArrayList(expectedDocsMap.values()), pipelineSnapshotToValues(snapshot));
+
+    // With NaN and a number.
+    expectedDocsMap = new LinkedHashMap<>(allDocs);
+    expectedDocsMap.remove("a");
+    expectedDocsMap.remove("c");
+    expectedDocsMap.remove("i");
+    expectedDocsMap.remove("j");
+    snapshot =
+        waitFor(
+            db.pipeline()
+                .convertFrom(collection.whereNotIn("zip", asList(Float.NaN, 98101L)))
+                .execute());
+    assertEquals(Lists.newArrayList(expectedDocsMap.values()), pipelineSnapshotToValues(snapshot));
+  }
+
+  @Test
+  public void testQueriesCanUseNotInFiltersWithDocIds() {
+    Map<String, String> docA = map("key", "aa");
+    Map<String, String> docB = map("key", "ab");
+    Map<String, String> docC = map("key", "ba");
+    Map<String, String> docD = map("key", "bb");
+    Map<String, Map<String, Object>> testDocs =
+        map(
+            "aa", docA,
+            "ab", docB,
+            "ba", docC,
+            "bb", docD);
+    CollectionReference collection = testCollectionWithDocs(testDocs);
+    FirebaseFirestore db = collection.firestore;
+    PipelineSnapshot docs =
+        waitFor(
+            db.pipeline()
+                .convertFrom(collection.whereNotIn(FieldPath.documentId(), asList("aa", "ab")))
+                .execute());
+    assertEquals(asList(docC, docD), pipelineSnapshotToValues(docs));
+  }
+
+  @Test
+  public void testQueriesCanUseArrayContainsAnyFilters() {
+    Map<String, Object> docA = map("array", asList(42L));
+    Map<String, Object> docB = map("array", asList("a", 42L, "c"));
+    Map<String, Object> docC = map("array", asList(41.999, "42", map("a", asList(42))));
+    Map<String, Object> docD = map("array", asList(42L), "array2", asList("bingo"));
+    Map<String, Object> docE = map("array", asList(43L));
+    Map<String, Object> docF = map("array", asList(map("a", 42L)));
+    Map<String, Object> docG = map("array", 42L);
+    Map<String, Object> docH = map("array", nullList());
+    Map<String, Object> docI = map("array", asList(Double.NaN));
+
+    CollectionReference collection =
+        testCollectionWithDocs(
+            map(
+                "a", docA, "b", docB, "c", docC, "d", docD, "e", docE, "f", docF, "g", docG, "h",
+                docH, "i", docI));
+    FirebaseFirestore db = collection.firestore;
+
+    // Search for "array" to contain [42, 43].
+    Pipeline pipeline = db.pipeline()
+        .convertFrom(collection.whereArrayContainsAny("array", asList(42L, 43L)));
+    PipelineSnapshot snapshot = waitFor(pipeline.execute());
+    assertEquals(asList(docA, docB, docD, docE), pipelineSnapshotToValues(snapshot));
+
+    // With objects.
+    pipeline = db.pipeline()
+        .convertFrom(collection.whereArrayContainsAny("array", asList(map("a", 42L))));
+    snapshot = waitFor(pipeline.execute());
+    assertEquals(asList(docF), pipelineSnapshotToValues(snapshot));
+
+    // With null.
+    pipeline = db.pipeline()
+        .convertFrom(collection.whereArrayContainsAny("array", nullList()));
+    snapshot = waitFor(pipeline.execute());
+    assertEquals(new ArrayList<>(), pipelineSnapshotToValues(snapshot));
+
+    // With null and a value.
+    List<Object> inputList = nullList();
+    inputList.add(43L);
+    pipeline = db.pipeline()
+        .convertFrom(collection.whereArrayContainsAny("array", inputList));
+    snapshot = waitFor(pipeline.execute());
+    assertEquals(asList(docE), pipelineSnapshotToValues(snapshot));
+
+    // With NaN.
+    pipeline = db.pipeline()
+        .convertFrom(collection.whereArrayContainsAny("array", asList(Double.NaN)));
+    snapshot = waitFor(pipeline.execute());
+    assertEquals(new ArrayList<>(), pipelineSnapshotToValues(snapshot));
+
+    // With NaN and a value.
+    pipeline = db.pipeline()
+        .convertFrom(collection.whereArrayContainsAny("array", asList(Double.NaN, 43L)));
+    snapshot = waitFor(pipeline.execute());
+    assertEquals(asList(docE), pipelineSnapshotToValues(snapshot));
+  }
+
+  @Test
+  public void testCollectionGroupQueries() {
+    FirebaseFirestore db = testFirestore();
+    // Use .document() to get a random collection group name to use but ensure it starts with 'b'
+    // for predictable ordering.
+    String collectionGroup = "b" + db.collection("foo").document().getId();
+
+    String[] docPaths =
+        new String[] {
+          "abc/123/${collectionGroup}/cg-doc1",
+          "abc/123/${collectionGroup}/cg-doc2",
+          "${collectionGroup}/cg-doc3",
+          "${collectionGroup}/cg-doc4",
+          "def/456/${collectionGroup}/cg-doc5",
+          "${collectionGroup}/virtual-doc/nested-coll/not-cg-doc",
+          "x${collectionGroup}/not-cg-doc",
+          "${collectionGroup}x/not-cg-doc",
+          "abc/123/${collectionGroup}x/not-cg-doc",
+          "abc/123/x${collectionGroup}/not-cg-doc",
+          "abc/${collectionGroup}"
+        };
+    WriteBatch batch = db.batch();
+    for (String path : docPaths) {
+      batch.set(db.document(path.replace("${collectionGroup}", collectionGroup)), map("x", 1));
+    }
+    waitFor(batch.commit());
+
+    PipelineSnapshot snapshot =
+        waitFor(db.pipeline().convertFrom(db.collectionGroup(collectionGroup)).execute());
+    assertEquals(
+        asList("cg-doc1", "cg-doc2", "cg-doc3", "cg-doc4", "cg-doc5"),
+        pipelineSnapshotToIds(snapshot));
+  }
+
+  @Test
+  public void testCollectionGroupQueriesWithStartAtEndAtWithArbitraryDocumentIds() {
+    FirebaseFirestore db = testFirestore();
+    // Use .document() to get a random collection group name to use but ensure it starts with 'b'
+    // for predictable ordering.
+    String collectionGroup = "b" + db.collection("foo").document().getId();
+
+    String[] docPaths =
+        new String[] {
+          "a/a/${collectionGroup}/cg-doc1",
+          "a/b/a/b/${collectionGroup}/cg-doc2",
+          "a/b/${collectionGroup}/cg-doc3",
+          "a/b/c/d/${collectionGroup}/cg-doc4",
+          "a/c/${collectionGroup}/cg-doc5",
+          "${collectionGroup}/cg-doc6",
+          "a/b/nope/nope"
+        };
+    WriteBatch batch = db.batch();
+    for (String path : docPaths) {
+      batch.set(db.document(path.replace("${collectionGroup}", collectionGroup)), map("x", 1));
+    }
+    waitFor(batch.commit());
+
+    PipelineSnapshot snapshot =
+        waitFor(
+            db.pipeline()
+                .convertFrom(
+                    db.collectionGroup(collectionGroup)
+                        .orderBy(FieldPath.documentId())
+                        .startAt("a/b")
+                        .endAt("a/b0"))
+                .execute());
+    assertEquals(asList("cg-doc2", "cg-doc3", "cg-doc4"), pipelineSnapshotToIds(snapshot));
+
+    snapshot =
+        waitFor(
+            db.pipeline()
+                .convertFrom(
+                    db.collectionGroup(collectionGroup)
+                        .orderBy(FieldPath.documentId())
+                        .startAfter("a/b")
+                        .endBefore("a/b/" + collectionGroup + "/cg-doc3"))
+                .execute());
+    assertEquals(asList("cg-doc2"), pipelineSnapshotToIds(snapshot));
+  }
+
+  @Test
+  public void testCollectionGroupQueriesWithWhereFiltersOnArbitraryDocumentIds() {
+    FirebaseFirestore db = testFirestore();
+    // Use .document() to get a random collection group name to use but ensure it starts with 'b'
+    // for predictable ordering.
+    String collectionGroup = "b" + db.collection("foo").document().getId();
+
+    String[] docPaths =
+        new String[] {
+          "a/a/${collectionGroup}/cg-doc1",
+          "a/b/a/b/${collectionGroup}/cg-doc2",
+          "a/b/${collectionGroup}/cg-doc3",
+          "a/b/c/d/${collectionGroup}/cg-doc4",
+          "a/c/${collectionGroup}/cg-doc5",
+          "${collectionGroup}/cg-doc6",
+          "a/b/nope/nope"
+        };
+    WriteBatch batch = db.batch();
+    for (String path : docPaths) {
+      batch.set(db.document(path.replace("${collectionGroup}", collectionGroup)), map("x", 1));
+    }
+    waitFor(batch.commit());
+
+    PipelineSnapshot snapshot =
+        waitFor(
+            db.pipeline()
+                .convertFrom(
+                    db.collectionGroup(collectionGroup)
+                        .whereGreaterThanOrEqualTo(FieldPath.documentId(), "a/b")
+                        .whereLessThanOrEqualTo(FieldPath.documentId(), "a/b0"))
+                .execute());
+    assertEquals(asList("cg-doc2", "cg-doc3", "cg-doc4"), pipelineSnapshotToIds(snapshot));
+
+    snapshot =
+        waitFor(
+            db.pipeline()
+                .convertFrom(
+                    db.collectionGroup(collectionGroup)
+                        .whereGreaterThan(FieldPath.documentId(), "a/b")
+                        .whereLessThan(
+                            FieldPath.documentId(), "a/b/" + collectionGroup + "/cg-doc3"))
+                .execute());
+    assertEquals(asList("cg-doc2"), pipelineSnapshotToIds(snapshot));
+  }
+
+  @Test
+  public void testOrQueries() {
+    Map<String, Map<String, Object>> testDocs =
+        map(
+            "doc1", map("a", 1, "b", 0),
+            "doc2", map("a", 2, "b", 1),
+            "doc3", map("a", 3, "b", 2),
+            "doc4", map("a", 1, "b", 3),
+            "doc5", map("a", 1, "b", 1));
+    CollectionReference collection = testCollectionWithDocs(testDocs);
+
+    // Two equalities: a==1 || b==1.
+    checkQueryAndPipelineResultsMatch(
+        collection.where(or(equalTo("a", 1), equalTo("b", 1))), "doc1", "doc2", "doc4", "doc5");
+
+    // (a==1 && b==0) || (a==3 && b==2)
+    checkQueryAndPipelineResultsMatch(
+        collection.where(
+            or(and(equalTo("a", 1), equalTo("b", 0)), and(equalTo("a", 3), equalTo("b", 2)))),
+        "doc1",
+        "doc3");
+
+    // a==1 && (b==0 || b==3).
+    checkQueryAndPipelineResultsMatch(
+        collection.where(and(equalTo("a", 1), or(equalTo("b", 0), equalTo("b", 3)))),
+        "doc1",
+        "doc4");
+
+    // (a==2 || b==2) && (a==3 || b==3)
+    checkQueryAndPipelineResultsMatch(
+        collection.where(
+            and(or(equalTo("a", 2), equalTo("b", 2)), or(equalTo("a", 3), equalTo("b", 3)))),
+        "doc3");
+
+    // Test with limits without orderBy (the __name__ ordering is the tie breaker).
+    checkQueryAndPipelineResultsMatch(
+        collection.where(or(equalTo("a", 2), equalTo("b", 1))).limit(1), "doc2");
+  }
+
+  @Test
+  public void testOrQueriesWithIn() {
+    Map<String, Map<String, Object>> testDocs =
+        map(
+            "doc1", map("a", 1, "b", 0),
+            "doc2", map("b", 1),
+            "doc3", map("a", 3, "b", 2),
+            "doc4", map("a", 1, "b", 3),
+            "doc5", map("a", 1),
+            "doc6", map("a", 2));
+    CollectionReference collection = testCollectionWithDocs(testDocs);
+
+    // a==2 || b in [2,3]
+    checkQueryAndPipelineResultsMatch(
+        collection.where(or(equalTo("a", 2), inArray("b", asList(2, 3)))), "doc3", "doc4", "doc6");
+  }
+
+  @Test
+  public void testOrQueriesWithArrayMembership() {
+    Map<String, Map<String, Object>> testDocs =
+        map(
+            "doc1", map("a", 1, "b", asList(0)),
+            "doc2", map("b", asList(1)),
+            "doc3", map("a", 3, "b", asList(2, 7)),
+            "doc4", map("a", 1, "b", asList(3, 7)),
+            "doc5", map("a", 1),
+            "doc6", map("a", 2));
+    CollectionReference collection = testCollectionWithDocs(testDocs);
+
+    // a==2 || b array-contains 7
+    checkQueryAndPipelineResultsMatch(
+        collection.where(or(equalTo("a", 2), arrayContains("b", 7))), "doc3", "doc4", "doc6");
+
+    // a==2 || b array-contains-any [0, 3]
+    checkQueryAndPipelineResultsMatch(
+        collection.where(or(equalTo("a", 2), arrayContainsAny("b", asList(0, 3)))),
+        "doc1",
+        "doc4",
+        "doc6");
+  }
+
+  @Test
+  public void testMultipleInOps() {
+    Map<String, Map<String, Object>> testDocs =
+        map(
+            "doc1", map("a", 1, "b", 0),
+            "doc2", map("b", 1),
+            "doc3", map("a", 3, "b", 2),
+            "doc4", map("a", 1, "b", 3),
+            "doc5", map("a", 1),
+            "doc6", map("a", 2));
+    CollectionReference collection = testCollectionWithDocs(testDocs);
+
+    // Two IN operations on different fields with disjunction.
+    Query query1 = collection.where(or(inArray("a", asList(2, 3)), inArray("b", asList(0, 2))));
+    checkQueryAndPipelineResultsMatch(query1, "doc1", "doc3", "doc6");
+
+    // Two IN operations on the same field with disjunction.
+    // a IN [0,3] || a IN [0,2] should union them (similar to: a IN [0,2,3]).
+    Query query2 = collection.where(or(inArray("a", asList(0, 3)), inArray("a", asList(0, 2))));
+    checkQueryAndPipelineResultsMatch(query2, "doc3", "doc6");
+  }
+
+  @Test
+  public void testUsingInWithArrayContainsAny() {
+    Map<String, Map<String, Object>> testDocs =
+        map(
+            "doc1", map("a", 1, "b", asList(0)),
+            "doc2", map("b", asList(1)),
+            "doc3", map("a", 3, "b", asList(2, 7), "c", 10),
+            "doc4", map("a", 1, "b", asList(3, 7)),
+            "doc5", map("a", 1),
+            "doc6", map("a", 2, "c", 20));
+    CollectionReference collection = testCollectionWithDocs(testDocs);
+
+    Query query1 =
+        collection.where(or(inArray("a", asList(2, 3)), arrayContainsAny("b", asList(0, 7))));
+    checkQueryAndPipelineResultsMatch(query1, "doc1", "doc3", "doc4", "doc6");
+
+    Query query2 =
+        collection.where(
+            or(
+                and(inArray("a", asList(2, 3)), equalTo("c", 10)),
+                arrayContainsAny("b", asList(0, 7))));
+    checkQueryAndPipelineResultsMatch(query2, "doc1", "doc3", "doc4");
+  }
+
+  @Test
+  public void testUsingInWithArrayContains() {
+    Map<String, Map<String, Object>> testDocs =
+        map(
+            "doc1", map("a", 1, "b", asList(0)),
+            "doc2", map("b", asList(1)),
+            "doc3", map("a", 3, "b", asList(2, 7)),
+            "doc4", map("a", 1, "b", asList(3, 7)),
+            "doc5", map("a", 1),
+            "doc6", map("a", 2));
+    CollectionReference collection = testCollectionWithDocs(testDocs);
+
+    Query query1 = collection.where(or(inArray("a", asList(2, 3)), arrayContains("b", 3)));
+    checkQueryAndPipelineResultsMatch(query1, "doc3", "doc4", "doc6");
+
+    Query query2 = collection.where(and(inArray("a", asList(2, 3)), arrayContains("b", 7)));
+    checkQueryAndPipelineResultsMatch(query2, "doc3");
+
+    Query query3 =
+        collection.where(
+            or(inArray("a", asList(2, 3)), and(arrayContains("b", 3), equalTo("a", 1))));
+    checkQueryAndPipelineResultsMatch(query3, "doc3", "doc4", "doc6");
+
+    Query query4 =
+        collection.where(
+            and(inArray("a", asList(2, 3)), or(arrayContains("b", 7), equalTo("a", 1))));
+    checkQueryAndPipelineResultsMatch(query4, "doc3");
+  }
+
+  @Test
+  public void testOrderByEquality() {
+    Map<String, Map<String, Object>> testDocs =
+        map(
+            "doc1", map("a", 1, "b", asList(0)),
+            "doc2", map("b", asList(1)),
+            "doc3", map("a", 3, "b", asList(2, 7), "c", 10),
+            "doc4", map("a", 1, "b", asList(3, 7)),
+            "doc5", map("a", 1),
+            "doc6", map("a", 2, "c", 20));
+    CollectionReference collection = testCollectionWithDocs(testDocs);
+
+    Query query1 = collection.where(equalTo("a", 1)).orderBy("a");
+    checkQueryAndPipelineResultsMatch(query1, "doc1", "doc4", "doc5");
+
+    Query query2 = collection.where(inArray("a", asList(2, 3))).orderBy("a");
+    checkQueryAndPipelineResultsMatch(query2, "doc6", "doc3");
+  }
+}
diff --git a/firebase-firestore/src/androidTest/java/com/google/firebase/firestore/testutil/IntegrationTestUtil.java b/firebase-firestore/src/androidTest/java/com/google/firebase/firestore/testutil/IntegrationTestUtil.java
index a7417d96563..717e3f02ebc 100644
--- a/firebase-firestore/src/androidTest/java/com/google/firebase/firestore/testutil/IntegrationTestUtil.java
+++ b/firebase-firestore/src/androidTest/java/com/google/firebase/firestore/testutil/IntegrationTestUtil.java
@@ -38,6 +38,8 @@
 import com.google.firebase.firestore.FirebaseFirestoreSettings;
 import com.google.firebase.firestore.ListenerRegistration;
 import com.google.firebase.firestore.MetadataChanges;
+import com.google.firebase.firestore.PipelineResult;
+import com.google.firebase.firestore.PipelineSnapshot;
 import com.google.firebase.firestore.Query;
 import com.google.firebase.firestore.QuerySnapshot;
 import com.google.firebase.firestore.Source;
@@ -98,7 +100,7 @@ public enum TargetBackend {
 
   // Set this to the desired enum value to change the target backend when running tests locally.
   // Note: DO NOT change this variable except for local testing.
-  private static final TargetBackend backendForLocalTesting = null;
+  private static final TargetBackend backendForLocalTesting = TargetBackend.NIGHTLY;
 
   private static final TargetBackend backend = getTargetBackend();
   private static final String EMULATOR_HOST = "10.0.2.2";
@@ -465,6 +467,15 @@ public static List<Map<String, Object>> querySnapshotToValues(QuerySnapshot quer
     return res;
   }
 
+  public static List<Map<String, Object>> pipelineSnapshotToValues(
+      PipelineSnapshot pipelineSnapshot) {
+    List<Map<String, Object>> res = new ArrayList<>();
+    for (PipelineResult result : pipelineSnapshot) {
+      res.add(result.getData());
+    }
+    return res;
+  }
+
   public static List<String> querySnapshotToIds(QuerySnapshot querySnapshot) {
     List<String> res = new ArrayList<>();
     for (DocumentSnapshot doc : querySnapshot) {
@@ -473,6 +484,15 @@ public static List<String> querySnapshotToIds(QuerySnapshot querySnapshot) {
     return res;
   }
 
+  public static List<String> pipelineSnapshotToIds(PipelineSnapshot pipelineResults) {
+    List<String> res = new ArrayList<>();
+    for (PipelineResult result : pipelineResults) {
+      DocumentReference ref = result.getRef();
+      res.add(ref == null ? null : ref.getId());
+    }
+    return res;
+  }
+
   public static void disableNetwork(FirebaseFirestore firestore) {
     if (firestoreStatus.get(firestore)) {
       waitFor(firestore.disableNetwork());
@@ -537,4 +557,33 @@ public static void checkOnlineAndOfflineResultsMatch(Query query, String... expe
       assertEquals(expected, querySnapshotToIds(docsFromCache));
     }
   }
+
+  /**
+   * Checks that running the query while online (against the backend/emulator) results in the same
+   * documents as running the query while offline. If `expectedDocs` is provided, it also checks
+   * that both online and offline query result is equal to the expected documents.
+   *
+   * @param query The query to check
+   * @param expectedDocs Ordered list of document keys that are expected to match the query
+   */
+  public static void checkQueryAndPipelineResultsMatch(Query query, String... expectedDocs) {
+    QuerySnapshot docsFromQuery;
+    try {
+      docsFromQuery = waitFor(query.get(Source.SERVER));
+    } catch (Exception e) {
+      throw new RuntimeException("Classic Query FAILED", e);
+    }
+    PipelineSnapshot docsFromPipeline;
+    try {
+        docsFromPipeline = waitFor(query.getFirestore().pipeline().convertFrom(query).execute());
+    } catch (Exception e) {
+      throw new RuntimeException("Pipeline FAILED", e);
+    }
+
+    assertEquals(querySnapshotToIds(docsFromQuery), pipelineSnapshotToIds(docsFromPipeline));
+    List<String> expected = asList(expectedDocs);
+    if (!expected.isEmpty()) {
+      assertEquals(expected, querySnapshotToIds(docsFromQuery));
+    }
+  }
 }
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/AggregateField.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/AggregateField.java
index 902d515d86f..a053a8d038a 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/AggregateField.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/AggregateField.java
@@ -14,9 +14,13 @@
 
 package com.google.firebase.firestore;
 
+import static com.google.firebase.firestore.pipeline.Expr.field;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.RestrictTo;
+import com.google.firebase.firestore.pipeline.AggregateFunction;
+import com.google.firebase.firestore.pipeline.AggregateWithAlias;
 import java.util.Objects;
 
 /** Represents an aggregation that can be performed by Firestore. */
@@ -61,6 +65,9 @@ public String getOperator() {
     return operator;
   }
 
+  @NonNull
+  abstract AggregateWithAlias toPipeline();
+
   /**
    * Returns true if the given object is equal to this object. Two `AggregateField` objects are
    * considered equal if they have the same operator and operate on the same field.
@@ -195,6 +202,12 @@ public static class CountAggregateField extends AggregateField {
     private CountAggregateField() {
       super(null, "count");
     }
+
+    @NonNull
+    @Override
+    AggregateWithAlias toPipeline() {
+      return AggregateFunction.countAll().alias(getAlias());
+    }
   }
 
   /** Represents a "sum" aggregation that can be performed by Firestore. */
@@ -202,6 +215,12 @@ public static class SumAggregateField extends AggregateField {
     private SumAggregateField(@NonNull FieldPath fieldPath) {
       super(fieldPath, "sum");
     }
+
+    @NonNull
+    @Override
+    AggregateWithAlias toPipeline() {
+      return field(getFieldPath()).sum().alias(getAlias());
+    }
   }
 
   /** Represents an "average" aggregation that can be performed by Firestore. */
@@ -209,5 +228,11 @@ public static class AverageAggregateField extends AggregateField {
     private AverageAggregateField(@NonNull FieldPath fieldPath) {
       super(fieldPath, "average");
     }
+
+    @NonNull
+    @Override
+    AggregateWithAlias toPipeline() {
+      return field(getFieldPath()).avg().alias(getAlias());
+    }
   }
 }
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/DocumentReference.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/DocumentReference.java
index e3097d32b00..f31e3103060 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/DocumentReference.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/DocumentReference.java
@@ -22,6 +22,7 @@
 import android.app.Activity;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.annotation.RestrictTo;
 import com.google.android.gms.tasks.Task;
 import com.google.android.gms.tasks.TaskCompletionSource;
 import com.google.android.gms.tasks.Tasks;
@@ -33,6 +34,7 @@
 import com.google.firebase.firestore.core.UserData.ParsedSetData;
 import com.google.firebase.firestore.core.UserData.ParsedUpdateData;
 import com.google.firebase.firestore.core.ViewSnapshot;
+import com.google.firebase.firestore.model.DatabaseId;
 import com.google.firebase.firestore.model.Document;
 import com.google.firebase.firestore.model.DocumentKey;
 import com.google.firebase.firestore.model.ResourcePath;
@@ -57,7 +59,7 @@
  * in test mocks. Subclassing is not supported in production code and new SDK releases may break
  * code that does so.
  */
-public class DocumentReference {
+public final class DocumentReference {
 
   private final DocumentKey key;
 
@@ -65,9 +67,7 @@ public class DocumentReference {
 
   DocumentReference(DocumentKey key, FirebaseFirestore firestore) {
     this.key = checkNotNull(key);
-    // TODO: We should checkNotNull(firestore), but tests are currently cheating
-    // and setting it to null.
-    this.firestore = firestore;
+    this.firestore = checkNotNull(firestore);
   }
 
   /** @hide */
@@ -120,6 +120,15 @@ public String getPath() {
     return key.getPath().canonicalString();
   }
 
+  @RestrictTo(RestrictTo.Scope.LIBRARY)
+  @NonNull
+  public String getFullPath() {
+    DatabaseId databaseId = firestore.getDatabaseId();
+    return String.format(
+        "projects/%s/databases/%s/documents/%s",
+        databaseId.getProjectId(), databaseId.getDatabaseId(), getPath());
+  }
+
   /**
    * Gets a {@code CollectionReference} instance that refers to the subcollection at the specified
    * path relative to this document.
@@ -564,6 +573,12 @@ public int hashCode() {
     return result;
   }
 
+  @NonNull
+  @Override
+  public String toString() {
+    return "DocumentReference{" + "key=" + key + ", firestore=" + firestore + '}';
+  }
+
   private com.google.firebase.firestore.core.Query asQuery() {
     return com.google.firebase.firestore.core.Query.atPath(key.getPath());
   }
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/DocumentSnapshot.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/DocumentSnapshot.java
index 4540608fc48..5c978b8cce9 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/DocumentSnapshot.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/DocumentSnapshot.java
@@ -555,6 +555,7 @@ public int hashCode() {
     return hash;
   }
 
+  @NonNull
   @Override
   public String toString() {
     return "DocumentSnapshot{" + "key=" + key + ", metadata=" + metadata + ", doc=" + doc + '}';
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/FieldPath.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/FieldPath.java
index 2b5302cff19..fe353b3391b 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/FieldPath.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/FieldPath.java
@@ -18,6 +18,7 @@
 import static com.google.firebase.firestore.util.Preconditions.checkNotNull;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.RestrictTo;
 import java.util.Arrays;
 import java.util.List;
 import java.util.regex.Pattern;
@@ -33,15 +34,18 @@ public final class FieldPath {
 
   private final com.google.firebase.firestore.model.FieldPath internalPath;
 
-  private FieldPath(List<String> segments) {
+  private FieldPath(@NonNull List<String> segments) {
     this.internalPath = com.google.firebase.firestore.model.FieldPath.fromSegments(segments);
   }
 
-  private FieldPath(com.google.firebase.firestore.model.FieldPath internalPath) {
+  private FieldPath(@NonNull com.google.firebase.firestore.model.FieldPath internalPath) {
     this.internalPath = internalPath;
   }
 
-  com.google.firebase.firestore.model.FieldPath getInternalPath() {
+  /** @hide */
+  @RestrictTo(RestrictTo.Scope.LIBRARY)
+  @NonNull
+  public com.google.firebase.firestore.model.FieldPath getInternalPath() {
     return internalPath;
   }
 
@@ -78,7 +82,9 @@ public static FieldPath documentId() {
   }
 
   /** Parses a field path string into a {@code FieldPath}, treating dots as separators. */
-  static FieldPath fromDotSeparatedPath(@NonNull String path) {
+  @RestrictTo(RestrictTo.Scope.LIBRARY)
+  @NonNull
+  public static FieldPath fromDotSeparatedPath(@NonNull String path) {
     checkNotNull(path, "Provided field path must not be null.");
     checkArgument(
         !RESERVED.matcher(path).find(), "Use FieldPath.of() for field names containing '~*/[]'.");
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/FirebaseFirestore.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/FirebaseFirestore.java
index c1218829b8a..fa0ccf7f90f 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/FirebaseFirestore.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/FirebaseFirestore.java
@@ -850,10 +850,12 @@ <T> T callClient(Function<FirestoreClient, T> call) {
     return clientProvider.call(call);
   }
 
+  @NonNull
   DatabaseId getDatabaseId() {
     return databaseId;
   }
 
+  @NonNull
   UserDataReader getUserDataReader() {
     return userDataReader;
   }
@@ -881,4 +883,15 @@ void validateReference(DocumentReference docRef) {
   static void setClientLanguage(@NonNull String languageToken) {
     FirestoreChannel.setClientLanguage(languageToken);
   }
+
+  /**
+   * Build a new Pipeline
+   *
+   * @return {@code PipelineSource} for this Firestore instance.
+   */
+  @NonNull
+  public PipelineSource pipeline() {
+    clientProvider.ensureConfigured();
+    return new PipelineSource(this);
+  }
 }
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/Firestore.kt b/firebase-firestore/src/main/java/com/google/firebase/firestore/Firestore.kt
index 9f5027b5e29..e2ccf89637d 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/Firestore.kt
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/Firestore.kt
@@ -21,7 +21,6 @@ import com.google.firebase.Firebase
 import com.google.firebase.FirebaseApp
 import com.google.firebase.components.Component
 import com.google.firebase.components.ComponentRegistrar
-import com.google.firebase.firestore.*
 import com.google.firebase.firestore.util.Executors.BACKGROUND_EXECUTOR
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.channels.awaitClose
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/Pipeline.kt b/firebase-firestore/src/main/java/com/google/firebase/firestore/Pipeline.kt
new file mode 100644
index 00000000000..fb7d8313737
--- /dev/null
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/Pipeline.kt
@@ -0,0 +1,826 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.firebase.firestore
+
+import com.google.android.gms.tasks.Task
+import com.google.android.gms.tasks.TaskCompletionSource
+import com.google.common.collect.FluentIterable
+import com.google.common.collect.ImmutableList
+import com.google.firebase.Timestamp
+import com.google.firebase.firestore.model.DocumentKey
+import com.google.firebase.firestore.model.Values
+import com.google.firebase.firestore.pipeline.AddFieldsStage
+import com.google.firebase.firestore.pipeline.AggregateFunction
+import com.google.firebase.firestore.pipeline.AggregateStage
+import com.google.firebase.firestore.pipeline.AggregateWithAlias
+import com.google.firebase.firestore.pipeline.BooleanExpr
+import com.google.firebase.firestore.pipeline.CollectionGroupSource
+import com.google.firebase.firestore.pipeline.CollectionSource
+import com.google.firebase.firestore.pipeline.DatabaseSource
+import com.google.firebase.firestore.pipeline.DistinctStage
+import com.google.firebase.firestore.pipeline.DocumentsSource
+import com.google.firebase.firestore.pipeline.Expr
+import com.google.firebase.firestore.pipeline.ExprWithAlias
+import com.google.firebase.firestore.pipeline.Field
+import com.google.firebase.firestore.pipeline.FindNearestStage
+import com.google.firebase.firestore.pipeline.FunctionExpr
+import com.google.firebase.firestore.pipeline.Stage
+import com.google.firebase.firestore.pipeline.LimitStage
+import com.google.firebase.firestore.pipeline.OffsetStage
+import com.google.firebase.firestore.pipeline.Ordering
+import com.google.firebase.firestore.pipeline.PipelineOptions
+import com.google.firebase.firestore.pipeline.RemoveFieldsStage
+import com.google.firebase.firestore.pipeline.ReplaceStage
+import com.google.firebase.firestore.pipeline.SampleStage
+import com.google.firebase.firestore.pipeline.SelectStage
+import com.google.firebase.firestore.pipeline.Selectable
+import com.google.firebase.firestore.pipeline.SortStage
+import com.google.firebase.firestore.pipeline.BaseStage
+import com.google.firebase.firestore.pipeline.UnionStage
+import com.google.firebase.firestore.pipeline.UnnestStage
+import com.google.firebase.firestore.pipeline.WhereStage
+import com.google.firestore.v1.ExecutePipelineRequest
+import com.google.firestore.v1.StructuredPipeline
+import com.google.firestore.v1.Value
+
+class Pipeline
+internal constructor(
+  internal val firestore: FirebaseFirestore,
+  internal val userDataReader: UserDataReader,
+  private val stages: FluentIterable<BaseStage<*>>
+) {
+  internal constructor(
+    firestore: FirebaseFirestore,
+    userDataReader: UserDataReader,
+    stage: BaseStage<*>
+  ) : this(firestore, userDataReader, FluentIterable.of(stage))
+
+  private fun append(stage: BaseStage<*>): Pipeline {
+    return Pipeline(firestore, userDataReader, stages.append(stage))
+  }
+
+  fun execute(): Task<PipelineSnapshot> = execute(PipelineOptions.DEFAULT)
+
+  fun execute(options: PipelineOptions): Task<PipelineSnapshot> {
+    val observerTask = ObserverSnapshotTask()
+    firestore.callClient { call -> call!!.executePipeline(toProto(options), observerTask) }
+    return observerTask.task
+  }
+
+  internal fun documentReference(key: DocumentKey): DocumentReference {
+    return DocumentReference(key, firestore)
+  }
+
+  private fun toProto(options: PipelineOptions): ExecutePipelineRequest {
+    val database = firestore.databaseId
+    val builder = ExecutePipelineRequest.newBuilder()
+    builder.database = "projects/${database.projectId}/databases/${database.databaseId}"
+    builder.structuredPipeline = toStructuredPipelineProto()
+    return builder.build()
+  }
+
+  private fun toStructuredPipelineProto(): StructuredPipeline {
+    val builder = StructuredPipeline.newBuilder()
+    builder.pipeline = toPipelineProto()
+    return builder.build()
+  }
+
+  internal fun toPipelineProto(): com.google.firestore.v1.Pipeline =
+    com.google.firestore.v1.Pipeline.newBuilder()
+      .addAllStages(stages.map { it.toProtoStage(userDataReader) })
+      .build()
+
+  /**
+   * Adds a stage to the pipeline by specifying the stage name as an argument. This does not offer
+   * any type safety on the stage params and requires the caller to know the order (and optionally
+   * names) of parameters accepted by the stage.
+   *
+   * This method provides a way to call stages that are supported by the Firestore backend but that
+   * are not implemented in the SDK version being used.
+   *
+   * @param stage An [Stage] object that specifies stage name and parameters.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun addStage(stage: Stage): Pipeline = append(stage)
+
+  /**
+   * Adds new fields to outputs from previous stages.
+   *
+   * This stage allows you to compute values on-the-fly based on existing data from previous stages
+   * or constants. You can use this to create new fields or overwrite existing ones.
+   *
+   * The added fields are defined using [Selectable]s, which can be:
+   *
+   * - [Field]: References an existing document field.
+   * - [ExprWithAlias]: Represents the result of a expression with an assigned alias name using
+   * [Expr.alias]
+   *
+   * @param field The first field to add to the documents, specified as a [Selectable].
+   * @param additionalFields The fields to add to the documents, specified as [Selectable]s.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun addFields(field: Selectable, vararg additionalFields: Selectable): Pipeline =
+    append(AddFieldsStage(arrayOf(field, *additionalFields)))
+
+  /**
+   * Remove fields from outputs of previous stages.
+   *
+   * @param field The first [Field] to remove.
+   * @param additionalFields Optional additional [Field]s to remove.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun removeFields(field: Field, vararg additionalFields: Field): Pipeline =
+    append(RemoveFieldsStage(arrayOf(field, *additionalFields)))
+
+  /**
+   * Remove fields from outputs of previous stages.
+   *
+   * @param field The first [String] name of field to remove.
+   * @param additionalFields Optional additional [String] name of fields to remove.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun removeFields(field: String, vararg additionalFields: String): Pipeline =
+    append(
+      RemoveFieldsStage(
+        arrayOf(Expr.field(field), *additionalFields.map(Expr::field).toTypedArray())
+      )
+    )
+
+  /**
+   * Selects or creates a set of fields from the outputs of previous stages.
+   *
+   * The selected fields are defined using [Selectable] expressions, which can be:
+   *
+   * - [String]: Name of an existing field
+   * - [Field]: Reference to an existing field.
+   * - [ExprWithAlias]: Represents the result of a expression with an assigned alias name using
+   * [Expr.alias]
+   *
+   * If no selections are provided, the output of this stage is empty. Use [Pipeline.addFields]
+   * instead if only additions are desired.
+   *
+   * @param selection The first field to include in the output documents, specified as a
+   * [Selectable] expression.
+   * @param additionalSelections Optional additional fields to include in the output documents,
+   * specified as [Selectable] expressions or string values representing field names.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun select(selection: Selectable, vararg additionalSelections: Any): Pipeline =
+    append(
+      SelectStage(
+        arrayOf(selection, *additionalSelections.map(Selectable::toSelectable).toTypedArray())
+      )
+    )
+
+  /**
+   * Selects or creates a set of fields from the outputs of previous stages.
+   *
+   * The selected fields are defined using [Selectable] expressions, which can be:
+   *
+   * - [String]: Name of an existing field
+   * - [Field]: Reference to an existing field.
+   * - [ExprWithAlias]: Represents the result of a expression with an assigned alias name using
+   * [Expr.alias]
+   *
+   * If no selections are provided, the output of this stage is empty. Use [Pipeline.addFields]
+   * instead if only additions are desired.
+   *
+   * @param fieldName The first field to include in the output documents, specified as a string
+   * value representing a field names.
+   * @param additionalSelections Optional additional fields to include in the output documents,
+   * specified as [Selectable] expressions or string values representing field names.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun select(fieldName: String, vararg additionalSelections: Any): Pipeline =
+    append(
+      SelectStage(
+        arrayOf(
+          Expr.field(fieldName),
+          *additionalSelections.map(Selectable::toSelectable).toTypedArray()
+        )
+      )
+    )
+
+  /**
+   * Sorts the documents from previous stages based on one or more [Ordering] criteria.
+   *
+   * This stage allows you to order the results of your pipeline. You can specify multiple
+   * [Ordering] instances to sort by multiple fields in ascending or descending order. If documents
+   * have the same value for a field used for sorting, the next specified ordering will be used. If
+   * all orderings result in equal comparison, the documents are considered equal and the order is
+   * unspecified.
+   *
+   * @param order The first [Ordering] instance specifying the sorting criteria.
+   * @param additionalOrders Optional additional [Ordering] instances specifying the sorting
+   * criteria.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun sort(order: Ordering, vararg additionalOrders: Ordering): Pipeline =
+    append(SortStage(arrayOf(order, *additionalOrders)))
+
+  /**
+   * Filters the documents from previous stages to only include those matching the specified
+   * [BooleanExpr].
+   *
+   * This stage allows you to apply conditions to the data, similar to a "WHERE" clause in SQL.
+   *
+   * You can filter documents based on their field values, using implementations of [BooleanExpr],
+   * typically including but not limited to:
+   *
+   * - field comparators: [Expr.eq], [Expr.lt] (less than), [Expr.gt] (greater than), etc.
+   * - logical operators: [Expr.and], [Expr.or], [Expr.not], etc.
+   * - advanced functions: [Expr.regexMatch], [Expr.arrayContains], etc.
+   *
+   * @param condition The [BooleanExpr] to apply.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun where(condition: BooleanExpr): Pipeline = append(WhereStage(condition))
+
+  /**
+   * Skips the first `offset` number of documents from the results of previous stages.
+   *
+   * This stage is useful for implementing pagination in your pipelines, allowing you to retrieve
+   * results in chunks. It is typically used in conjunction with [limit] to control the size of each
+   * page.
+   *
+   * @param offset The number of documents to skip.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun offset(offset: Int): Pipeline = append(OffsetStage(offset))
+
+  /**
+   * Limits the maximum number of documents returned by previous stages to `limit`.
+   *
+   * This stage is particularly useful when you want to retrieve a controlled subset of data from a
+   * potentially large result set. It's often used for:
+   *
+   * - **Pagination:** In combination with [offset] to retrieve specific pages of results.
+   * - **Limiting Data Retrieval:** To prevent excessive data transfer and improve performance,
+   * especially when dealing with large collections.
+   *
+   * @param limit The maximum number of documents to return.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun limit(limit: Int): Pipeline = append(LimitStage(limit))
+
+  /**
+   * Returns a set of distinct values from the inputs to this stage.
+   *
+   * This stage runs through the results from previous stages to include only results with unique
+   * combinations of [Expr] values [Field], [FunctionExpr], etc).
+   *
+   * The parameters to this stage are defined using [Selectable] expressions or strings:
+   *
+   * - [String]: Name of an existing field
+   * - [Field]: References an existing document field.
+   * - [ExprWithAlias]: Represents the result of a function with an assigned alias name using
+   * [Expr.alias]
+   *
+   * @param group The [Selectable] expression to consider when determining distinct value
+   * combinations.
+   * @param additionalGroups The [Selectable] expressions to consider when determining distinct
+   * value combinations or [String]s representing field names.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun distinct(group: Selectable, vararg additionalGroups: Any): Pipeline =
+    append(
+      DistinctStage(arrayOf(group, *additionalGroups.map(Selectable::toSelectable).toTypedArray()))
+    )
+
+  /**
+   * Returns a set of distinct values from the inputs to this stage.
+   *
+   * This stage runs through the results from previous stages to include only results with unique
+   * combinations of [Expr] values ([Field], [FunctionExpr], etc).
+   *
+   * The parameters to this stage are defined using [Selectable] expressions or strings:
+   *
+   * - [String]: Name of an existing field
+   * - [Field]: References an existing document field.
+   * - [ExprWithAlias]: Represents the result of a function with an assigned alias name using
+   * [Expr.alias]
+   *
+   * @param groupField The [String] representing field name.
+   * @param additionalGroups The [Selectable] expressions to consider when determining distinct
+   * value combinations or [String]s representing field names.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun distinct(groupField: String, vararg additionalGroups: Any): Pipeline =
+    append(
+      DistinctStage(
+        arrayOf(
+          Expr.field(groupField),
+          *additionalGroups.map(Selectable::toSelectable).toTypedArray()
+        )
+      )
+    )
+
+  /**
+   * Performs aggregation operations on the documents from previous stages.
+   *
+   * This stage allows you to calculate aggregate values over a set of documents. You define the
+   * aggregations to perform using [AggregateWithAlias] expressions which are typically results of
+   * calling [AggregateFunction.alias] on [AggregateFunction] instances.
+   *
+   * @param accumulator The first [AggregateWithAlias] expression, wrapping an [AggregateFunction]
+   * with an alias for the accumulated results.
+   * @param additionalAccumulators The [AggregateWithAlias] expressions, each wrapping an
+   * [AggregateFunction] with an alias for the accumulated results.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun aggregate(
+    accumulator: AggregateWithAlias,
+    vararg additionalAccumulators: AggregateWithAlias
+  ): Pipeline = append(AggregateStage.withAccumulators(accumulator, *additionalAccumulators))
+
+  /**
+   * Performs optionally grouped aggregation operations on the documents from previous stages.
+   *
+   * This stage allows you to calculate aggregate values over a set of documents, optionally grouped
+   * by one or more fields or functions. You can specify:
+   *
+   * - **Grouping Fields or Expressions:** One or more fields or functions to group the documents
+   * by. For each distinct combination of values in these fields, a separate group is created. If no
+   * grouping fields are provided, a single group containing all documents is used. Not specifying
+   * groups is the same as putting the entire inputs into one group.
+   *
+   * - **AggregateFunctions:** One or more accumulation operations to perform within each group.
+   * These are defined using [AggregateWithAlias] expressions, which are typically created by
+   * calling [AggregateFunction.alias] on [AggregateFunction] instances. Each aggregation calculates
+   * a value (e.g., sum, average, count) based on the documents within its group.
+   *
+   * @param aggregateStage An [AggregateStage] object that specifies the grouping fields (if any)
+   * and the aggregation operations to perform.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun aggregate(aggregateStage: AggregateStage): Pipeline = append(aggregateStage)
+
+  /**
+   * Performs a vector similarity search, ordering the result set by most similar to least similar,
+   * and returning the first N documents in the result set.
+   *
+   * @param vectorField A [Field] that contains vector to search on.
+   * @param vectorValue The [VectorValue] in array form that is used to measure the distance from
+   * [vectorField] values in the documents.
+   * @param distanceMeasure specifies what type of distance is calculated when performing the
+   * search.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun findNearest(
+    vectorField: Field,
+    vectorValue: DoubleArray,
+    distanceMeasure: FindNearestStage.DistanceMeasure,
+  ): Pipeline = append(FindNearestStage.of(vectorField, vectorValue, distanceMeasure))
+
+  /**
+   * Performs a vector similarity search, ordering the result set by most similar to least similar,
+   * and returning the first N documents in the result set.
+   *
+   * @param vectorField A [String] specifying the vector field to search on.
+   * @param vectorValue The [VectorValue] in array form that is used to measure the distance from
+   * [vectorField] values in the documents.
+   * @param distanceMeasure specifies what type of distance is calculated when performing the
+   * search.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun findNearest(
+    vectorField: String,
+    vectorValue: DoubleArray,
+    distanceMeasure: FindNearestStage.DistanceMeasure,
+  ): Pipeline = append(FindNearestStage.of(vectorField, vectorValue, distanceMeasure))
+
+  /**
+   * Performs a vector similarity search, ordering the result set by most similar to least similar,
+   * and returning the first N documents in the result set.
+   *
+   * @param vectorField A [Field] that contains vector to search on.
+   * @param vectorValue The [VectorValue] used to measure the distance from [vectorField] values in
+   * the documents.
+   * @param distanceMeasure specifies what type of distance is calculated. when performing the
+   * search.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun findNearest(
+    vectorField: Field,
+    vectorValue: VectorValue,
+    distanceMeasure: FindNearestStage.DistanceMeasure,
+  ): Pipeline = append(FindNearestStage.of(vectorField, vectorValue, distanceMeasure))
+
+  /**
+   * Performs a vector similarity search, ordering the result set by most similar to least similar,
+   * and returning the first N documents in the result set.
+   *
+   * @param vectorField A [String] specifying the vector field to search on.
+   * @param vectorValue The [VectorValue] used to measure the distance from [vectorField] values in
+   * the documents.
+   * @param distanceMeasure specifies what type of distance is calculated when performing the
+   * search.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun findNearest(
+    vectorField: String,
+    vectorValue: VectorValue,
+    distanceMeasure: FindNearestStage.DistanceMeasure,
+  ): Pipeline = append(FindNearestStage.of(vectorField, vectorValue, distanceMeasure))
+
+  /**
+   * Performs a vector similarity search, ordering the result set by most similar to least similar,
+   * and returning the first N documents in the result set.
+   *
+   * @param stage An [FindNearestStage] object that specifies the search parameters.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun findNearest(stage: FindNearestStage): Pipeline = append(stage)
+
+  /**
+   * Fully overwrites all fields in a document with those coming from a nested map.
+   *
+   * This stage allows you to emit a map value as a document. Each key of the map becomes a field on
+   * the document that contains the corresponding value.
+   *
+   * @param field The [String] specifying the field name containing the nested map.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun replace(field: String): Pipeline = replace(Expr.field(field))
+
+  /**
+   * Fully overwrites all fields in a document with those coming from a nested map.
+   *
+   * This stage allows you to emit a map value as a document. Each key of the map becomes a field on
+   * the document that contains the corresponding value.
+   *
+   * @param mapValue The [Expr] or [Field] containing the nested map.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun replace(mapValue: Expr): Pipeline =
+    append(ReplaceStage(mapValue, ReplaceStage.Mode.FULL_REPLACE))
+
+  /**
+   * Performs a pseudo-random sampling of the input documents.
+   *
+   * The [documents] parameter represents the target number of documents to produce and must be a
+   * non-negative integer value. If the previous stage produces less than size documents, the entire
+   * previous results are returned. If the previous stage produces more than size, this outputs a
+   * sample of exactly size entries where any sample is equally likely.
+   *
+   * @param documents The number of documents to emit.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun sample(documents: Int): Pipeline = append(SampleStage.withDocLimit(documents))
+
+  /**
+   * Performs a pseudo-random sampling of the input documents.
+   *
+   * @param sample An [SampleStage] object that specifies how sampling is performed.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun sample(sample: SampleStage): Pipeline = append(sample)
+
+  /**
+   * Performs union of all documents from two pipelines, including duplicates.
+   *
+   * This stage will pass through documents from previous stage, and also pass through documents
+   * from previous stage of the `other` Pipeline given in parameter. The order of documents emitted
+   * from this stage is undefined.
+   *
+   * @param other The other [Pipeline] that is part of union.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun union(other: Pipeline): Pipeline = append(UnionStage(other))
+
+  /**
+   * Takes a specified array from the input documents and outputs a document for each element with
+   * the element stored in a field with name specified by the alias.
+   *
+   * For each document emitted by the prior stage, this stage will emit zero or more augmented
+   * documents. The input array found in the previous stage document field specified by the
+   * [arrayField] parameter, will for each element of the input array produce an augmented document.
+   * The element of the input array will be stored in a field with name specified by [alias]
+   * parameter on the augmented document.
+   *
+   * @param arrayField The name of the field containing the array.
+   * @param alias The name of field to store emitted element of array.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun unnest(arrayField: String, alias: String): Pipeline =
+    unnest(Expr.field(arrayField).alias(alias))
+
+  /**
+   * Takes a specified array from the input documents and outputs a document for each element with
+   * the element stored in a field with name specified by the alias.
+   *
+   * For each document emitted by the prior stage, this stage will emit zero or more augmented
+   * documents. The input array is found in parameter [arrayWithAlias], which can be an [Expr] with
+   * an alias specified via [Expr.alias], or a [Field] that can also have alias specified. For each
+   * element of the input array, an augmented document will be produced. The element of input array
+   * will be stored in a field with name specified by the alias of the [arrayWithAlias] parameter.
+   * If the [arrayWithAlias] is a [Field] with no alias, then the original array field will be
+   * replaced with the individual element.
+   *
+   * @param arrayWithAlias The input array with field alias to store output element of array.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun unnest(arrayWithAlias: Selectable): Pipeline = append(UnnestStage(arrayWithAlias))
+
+  /**
+   * Takes a specified array from the input documents and outputs a document for each element with
+   * the element stored in a field with name specified by the alias.
+   *
+   * For each document emitted by the prior stage, this stage will emit zero or more augmented
+   * documents. The input array specified in the [unnestStage] parameter will for each element of
+   * the input array produce an augmented document. The element of the input array will be stored in
+   * a field with a name specified by the [unnestStage] parameter.
+   *
+   * Optionally, an index field can also be added to emitted documents. See [UnnestStage] for
+   * further information.
+   *
+   * @param unnestStage An [UnnestStage] object that specifies the search parameters.
+   * @return A new [Pipeline] object with this stage appended to the stage list.
+   */
+  fun unnest(unnestStage: UnnestStage): Pipeline = append(unnestStage)
+
+  private inner class ObserverSnapshotTask : PipelineResultObserver {
+    private val userDataWriter =
+      UserDataWriter(firestore, DocumentSnapshot.ServerTimestampBehavior.DEFAULT)
+    private val taskCompletionSource = TaskCompletionSource<PipelineSnapshot>()
+    private val results: ImmutableList.Builder<PipelineResult> = ImmutableList.builder()
+    override fun onDocument(
+      key: DocumentKey?,
+      data: Map<String, Value>,
+      createTime: Timestamp?,
+      updateTime: Timestamp?
+    ) {
+      results.add(
+        PipelineResult(
+          firestore,
+          userDataWriter,
+          if (key == null) null else DocumentReference(key, firestore),
+          data,
+          createTime,
+          updateTime
+        )
+      )
+    }
+
+    override fun onComplete(executionTime: Timestamp) {
+      taskCompletionSource.setResult(PipelineSnapshot(executionTime, results.build()))
+    }
+
+    override fun onError(exception: FirebaseFirestoreException) {
+      taskCompletionSource.setException(exception)
+    }
+
+    val task: Task<PipelineSnapshot>
+      get() = taskCompletionSource.task
+  }
+}
+
+/** Start of a Firestore Pipeline */
+class PipelineSource internal constructor(private val firestore: FirebaseFirestore) {
+
+  /**
+   * Convert the given Query into an equivalent Pipeline.
+   *
+   * @param query A Query to be converted into a Pipeline.
+   * @return A new [Pipeline] object that is equivalent to [query]
+   * @throws [IllegalArgumentException] Thrown if the [query] provided targets a different project
+   * or database than the pipeline.
+   */
+  fun convertFrom(query: Query): Pipeline {
+    if (query.firestore.databaseId != firestore.databaseId) {
+      throw IllegalArgumentException("Provided query is from a different Firestore instance.")
+    }
+    return query.query.toPipeline(firestore, firestore.userDataReader)
+  }
+
+  /**
+   * Convert the given Aggregate Query into an equivalent Pipeline.
+   *
+   * @param aggregateQuery An Aggregate Query to be converted into a Pipeline.
+   * @return A new [Pipeline] object that is equivalent to [aggregateQuery]
+   * @throws [IllegalArgumentException] Thrown if the [aggregateQuery] provided targets a different
+   * project or database than the pipeline.
+   */
+  fun convertFrom(aggregateQuery: AggregateQuery): Pipeline {
+    val aggregateFields = aggregateQuery.aggregateFields
+    return convertFrom(aggregateQuery.query)
+      .aggregate(
+        aggregateFields.first().toPipeline(),
+        *aggregateFields.drop(1).map(AggregateField::toPipeline).toTypedArray<AggregateWithAlias>()
+      )
+  }
+
+  /**
+   * Set the pipeline's source to the collection specified by the given path.
+   *
+   * @param path A path to a collection that will be the source of this pipeline.
+   * @return A new [Pipeline] object with documents from target collection.
+   */
+  fun collection(path: String): Pipeline = collection(CollectionSource.of(path))
+
+  /**
+   * Set the pipeline's source to the collection specified by the given [CollectionReference].
+   *
+   * @param ref A [CollectionReference] for a collection that will be the source of this pipeline.
+   * @return A new [Pipeline] object with documents from target collection.
+   * @throws [IllegalArgumentException] Thrown if the [ref] provided targets a different project or
+   * database than the pipeline.
+   */
+  fun collection(ref: CollectionReference): Pipeline = collection(CollectionSource.of(ref))
+
+  /**
+   * Set the pipeline's source to the collection specified by CollectionSource.
+   *
+   * @param stage A [CollectionSource] that will be the source of this pipeline.
+   * @return Pipeline with documents from target collection.
+   * @throws [IllegalArgumentException] Thrown if the [stage] provided targets a different project
+   * or database than the pipeline.
+   */
+  fun collection(stage: CollectionSource): Pipeline {
+    if (stage.firestore != null && stage.firestore.databaseId != firestore.databaseId) {
+      throw IllegalArgumentException("Provided collection is from a different Firestore instance.")
+    }
+    return Pipeline(firestore, firestore.userDataReader, stage)
+  }
+
+  /**
+   * Set the pipeline's source to the collection group with the given id.
+   *
+   * @param collectionId The id of a collection group that will be the source of this pipeline.
+   */
+  fun collectionGroup(collectionId: String): Pipeline =
+    pipeline(CollectionGroupSource.of((collectionId)))
+
+  fun pipeline(stage: CollectionGroupSource): Pipeline =
+    Pipeline(firestore, firestore.userDataReader, stage)
+
+  /**
+   * Set the pipeline's source to be all documents in this database.
+   *
+   * @return A new [Pipeline] object with all documents in this database.
+   */
+  fun database(): Pipeline = Pipeline(firestore, firestore.userDataReader, DatabaseSource())
+
+  /**
+   * Set the pipeline's source to the documents specified by the given paths.
+   *
+   * @param documents Paths specifying the individual documents that will be the source of this
+   * pipeline.
+   * @return A new [Pipeline] object with [documents].
+   */
+  fun documents(vararg documents: String): Pipeline =
+    // Validate document path by converting to DocumentReference
+    documents(*documents.map(firestore::document).toTypedArray())
+
+  /**
+   * Set the pipeline's source to the documents specified by the given DocumentReferences.
+   *
+   * @param documents DocumentReferences specifying the individual documents that will be the source
+   * of this pipeline.
+   * @return Pipeline with [documents].
+   * @throws [IllegalArgumentException] Thrown if the [documents] provided targets a different
+   * project or database than the pipeline.
+   */
+  fun documents(vararg documents: DocumentReference): Pipeline {
+    val databaseId = firestore.databaseId
+    for (document in documents) {
+      if (document.firestore.databaseId != databaseId) {
+        throw IllegalArgumentException(
+          "Provided document reference is from a different Firestore instance."
+        )
+      }
+    }
+    return Pipeline(
+      firestore,
+      firestore.userDataReader,
+      DocumentsSource(documents.map { docRef -> "/" + docRef.path }.toTypedArray())
+    )
+  }
+}
+
+/**
+ */
+class PipelineSnapshot
+internal constructor(executionTime: Timestamp, results: List<PipelineResult>) :
+  Iterable<PipelineResult> {
+
+  /** The time at which the pipeline producing this result is executed. */
+  val executionTime: Timestamp = executionTime
+
+  /** List of all the results */
+  val results: List<PipelineResult> = results
+
+  override fun iterator() = results.iterator()
+}
+
+class PipelineResult
+internal constructor(
+  private val firestore: FirebaseFirestore,
+  private val userDataWriter: UserDataWriter,
+  ref: DocumentReference?,
+  private val fields: Map<String, Value>,
+  createTime: Timestamp?,
+  updateTime: Timestamp?,
+) {
+
+  /** The time the document was created. Null if this result is not a document. */
+  val createTime: Timestamp? = createTime
+
+  /**
+   * The time the document was last updated (at the time the snapshot was generated). Null if this
+   * result is not a document.
+   */
+  val updateTime: Timestamp? = updateTime
+
+  /**
+   * The reference to the document, if the query returns the `__name__` field for a document. The
+   * name field will be returned by default if querying a document.
+   *
+   * The `__name__` field will not be returned if the query projects away this field. For example:
+   * ```
+   *   // this query does not select the `__name__` field as part of the select stage,
+   *   // so the __name__ field will not be in the output docs from this stage
+   *   db.pipeline().collection("books").select("title", "desc")
+   * ```
+   *
+   * The `__name__` field will not be returned from queries with aggregate or distinct stages.
+   *
+   * @return [DocumentReference] Reference to the document, if applicable.
+   */
+  val ref: DocumentReference? = ref
+
+  /**
+   * Returns the ID of the document represented by this result. Returns null if this result is not
+   * corresponding to a Firestore document.
+   *
+   * @return ID of document, if applicable.
+   */
+  fun getId(): String? = ref?.id
+
+  /**
+   * Retrieves all fields in the result as an object map.
+   *
+   * @return Map of field names to objects.
+   */
+  fun getData(): Map<String, Any?> = userDataWriter.convertObject(fields)
+
+  private fun extractNestedValue(fieldPath: FieldPath): Value? {
+    val segments = fieldPath.internalPath.iterator()
+    if (!segments.hasNext()) {
+      return Values.encodeValue(fields)
+    }
+    val firstSegment = segments.next()
+    if (!fields.containsKey(firstSegment)) {
+      return null
+    }
+    var value: Value? = fields[firstSegment]
+    for (segment in segments) {
+      if (value == null || !value.hasMapValue()) {
+        return null
+      }
+      value = value.mapValue.getFieldsOrDefault(segment, null)
+    }
+    return value
+  }
+
+  /**
+   * Retrieves the field specified by [field].
+   *
+   * @param field The field path (e.g. "foo" or "foo.bar") to a specific field.
+   * @return The data at the specified field location or null if no such field exists.
+   */
+  fun get(field: String): Any? = get(FieldPath.fromDotSeparatedPath(field))
+
+  /**
+   * Retrieves the field specified by [fieldPath].
+   *
+   * @param fieldPath The field path to a specific field.
+   * @return The data at the specified field location or null if no such field exists.
+   */
+  fun get(fieldPath: FieldPath): Any? = userDataWriter.convertValue(extractNestedValue(fieldPath))
+
+  override fun toString() = "PipelineResult{ref=$ref, updateTime=$updateTime}, data=${getData()}"
+}
+
+internal interface PipelineResultObserver {
+  fun onDocument(
+    key: DocumentKey?,
+    data: Map<String, Value>,
+    createTime: Timestamp?,
+    updateTime: Timestamp?
+  )
+  fun onComplete(executionTime: Timestamp)
+  fun onError(exception: FirebaseFirestoreException)
+}
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/UserDataReader.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/UserDataReader.java
index 297479d0262..97c9d9d33e1 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/UserDataReader.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/UserDataReader.java
@@ -19,7 +19,7 @@
 
 import androidx.annotation.Nullable;
 import androidx.annotation.RestrictTo;
-import com.google.firebase.Timestamp;
+import com.google.common.base.Function;
 import com.google.firebase.firestore.FieldValue.ArrayRemoveFieldValue;
 import com.google.firebase.firestore.FieldValue.ArrayUnionFieldValue;
 import com.google.firebase.firestore.FieldValue.DeleteFieldValue;
@@ -37,6 +37,7 @@
 import com.google.firebase.firestore.model.mutation.FieldMask;
 import com.google.firebase.firestore.model.mutation.NumericIncrementTransformOperation;
 import com.google.firebase.firestore.model.mutation.ServerTimestampOperation;
+import com.google.firebase.firestore.pipeline.Expr;
 import com.google.firebase.firestore.util.Assert;
 import com.google.firebase.firestore.util.CustomClassMapper;
 import com.google.firebase.firestore.util.Util;
@@ -44,9 +45,7 @@
 import com.google.firestore.v1.MapValue;
 import com.google.firestore.v1.Value;
 import com.google.protobuf.NullValue;
-import com.google.type.LatLng;
 import java.util.ArrayList;
-import java.util.Date;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
@@ -231,7 +230,7 @@ private ObjectValue convertAndParseDocumentData(Object input, ParseContext conte
 
     Object converted = CustomClassMapper.convertToPlainJavaTypes(input);
     Value parsedValue = parseData(converted, context);
-    if (parsedValue.getValueTypeCase() != Value.ValueTypeCase.MAP_VALUE) {
+    if (!parsedValue.hasMapValue()) {
       throw new IllegalArgumentException(badDocReason + "of type: " + Util.typeName(input));
     }
     return new ObjectValue(parsedValue);
@@ -387,90 +386,38 @@ private void parseSentinelFieldValue(
    * @return The parsed value, or {@code null} if the value was a FieldValue sentinel that should
    *     not be included in the resulting parsed data.
    */
-  private Value parseScalarValue(Object input, ParseContext context) {
+  public Value parseScalarValue(Object input, ParseContext context) {
     if (input == null) {
-      return Value.newBuilder().setNullValue(NullValue.NULL_VALUE).build();
-    } else if (input instanceof Integer) {
-      return Value.newBuilder().setIntegerValue((Integer) input).build();
-    } else if (input instanceof Long) {
-      return Value.newBuilder().setIntegerValue((Long) input).build();
-    } else if (input instanceof Float) {
-      return Value.newBuilder().setDoubleValue(((Float) input).doubleValue()).build();
-    } else if (input instanceof Double) {
-      return Value.newBuilder().setDoubleValue((Double) input).build();
-    } else if (input instanceof Boolean) {
-      return Value.newBuilder().setBooleanValue((Boolean) input).build();
-    } else if (input instanceof String) {
-      return Value.newBuilder().setStringValue((String) input).build();
-    } else if (input instanceof Date) {
-      Timestamp timestamp = new Timestamp((Date) input);
-      return parseTimestamp(timestamp);
-    } else if (input instanceof Timestamp) {
-      Timestamp timestamp = (Timestamp) input;
-      return parseTimestamp(timestamp);
-    } else if (input instanceof GeoPoint) {
-      GeoPoint geoPoint = (GeoPoint) input;
-      return Value.newBuilder()
-          .setGeoPointValue(
-              LatLng.newBuilder()
-                  .setLatitude(geoPoint.getLatitude())
-                  .setLongitude(geoPoint.getLongitude()))
-          .build();
-    } else if (input instanceof Blob) {
-      return Value.newBuilder().setBytesValue(((Blob) input).toByteString()).build();
-    } else if (input instanceof DocumentReference) {
-      DocumentReference ref = (DocumentReference) input;
-      // TODO: Rework once pre-converter is ported to Android.
-      if (ref.getFirestore() != null) {
-        DatabaseId otherDb = ref.getFirestore().getDatabaseId();
-        if (!otherDb.equals(databaseId)) {
-          throw context.createError(
-              String.format(
-                  "Document reference is for database %s/%s but should be for database %s/%s",
-                  otherDb.getProjectId(),
-                  otherDb.getDatabaseId(),
-                  databaseId.getProjectId(),
-                  databaseId.getDatabaseId()));
-        }
-      }
-      return Value.newBuilder()
-          .setReferenceValue(
-              String.format(
-                  "projects/%s/databases/%s/documents/%s",
-                  databaseId.getProjectId(),
-                  databaseId.getDatabaseId(),
-                  ((DocumentReference) input).getPath()))
-          .build();
-    } else if (input instanceof VectorValue) {
-      return parseVectorValue(((VectorValue) input), context);
+      return Values.NULL_VALUE;
     } else if (input.getClass().isArray()) {
       throw context.createError("Arrays are not supported; use a List instead");
+    } else if (input instanceof DocumentReference) {
+      DocumentReference ref = (DocumentReference) input;
+      validateDocumentReference(ref, context::createError);
+      return Values.encodeValue(ref);
+    } else if (input instanceof Expr) {
+      throw context.createError("Pipeline expressions are not supported user objects");
     } else {
-      throw context.createError("Unsupported type: " + Util.typeName(input));
+      try {
+        return Values.encodeAnyValue(input);
+      } catch (IllegalArgumentException e) {
+        throw context.createError("Unsupported type: " + Util.typeName(input));
+      }
     }
   }
 
-  private Value parseVectorValue(VectorValue vector, ParseContext context) {
-    MapValue.Builder mapBuilder = MapValue.newBuilder();
-
-    mapBuilder.putFields(Values.TYPE_KEY, Values.VECTOR_VALUE_TYPE);
-    mapBuilder.putFields(Values.VECTOR_MAP_VECTORS_KEY, parseData(vector.toList(), context));
-
-    return Value.newBuilder().setMapValue(mapBuilder).build();
-  }
-
-  private Value parseTimestamp(Timestamp timestamp) {
-    // Firestore backend truncates precision down to microseconds. To ensure offline mode works
-    // the same with regards to truncation, perform the truncation immediately without waiting for
-    // the backend to do that.
-    int truncatedNanoseconds = timestamp.getNanoseconds() / 1000 * 1000;
-
-    return Value.newBuilder()
-        .setTimestampValue(
-            com.google.protobuf.Timestamp.newBuilder()
-                .setSeconds(timestamp.getSeconds())
-                .setNanos(truncatedNanoseconds))
-        .build();
+  public void validateDocumentReference(
+      DocumentReference ref, Function<String, RuntimeException> createError) {
+    DatabaseId otherDb = ref.getFirestore().getDatabaseId();
+    if (!otherDb.equals(databaseId)) {
+      throw createError.apply(
+          String.format(
+              "Document reference is for database %s/%s but should be for database %s/%s",
+              otherDb.getProjectId(),
+              otherDb.getDatabaseId(),
+              databaseId.getProjectId(),
+              databaseId.getDatabaseId()));
+    }
   }
 
   private List<Value> parseArrayTransformElements(List<Object> elements) {
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/UserDataWriter.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/UserDataWriter.java
index d6ac7b90bba..8c90a4d02e4 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/UserDataWriter.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/UserDataWriter.java
@@ -78,7 +78,7 @@ public Object convertValue(Value value) {
       case TYPE_ORDER_BOOLEAN:
         return value.getBooleanValue();
       case TYPE_ORDER_NUMBER:
-        return value.getValueTypeCase().equals(Value.ValueTypeCase.INTEGER_VALUE)
+        return value.hasIntegerValue()
             ? (Object) value.getIntegerValue() // Cast to Object to prevent type coercion to double
             : (Object) value.getDoubleValue();
       case TYPE_ORDER_STRING:
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/VectorValue.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/VectorValue.java
index 2f355648376..efcefd45bf4 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/VectorValue.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/VectorValue.java
@@ -16,9 +16,7 @@
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
-import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.List;
 
 /**
  * Represent a vector type in Firestore documents.
@@ -41,21 +39,6 @@ public double[] toArray() {
     return this.values.clone();
   }
 
-  /**
-   * Package private.
-   * Returns a representation of the vector as a List<Doubles>.
-   *
-   * @return A representation of the vector as an List<Doubles>
-   */
-  @NonNull
-  List<Double> toList() {
-    ArrayList<Double> result = new ArrayList<Double>(this.values.length);
-    for (int i = 0; i < this.values.length; i++) {
-      result.add(i, this.values[i]);
-    }
-    return result;
-  }
-
   /**
    * Returns true if this VectorValue is equal to the provided object.
    *
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/core/CompositeFilter.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/core/CompositeFilter.java
index 26654f7a1ba..090ddf9c17b 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/core/CompositeFilter.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/core/CompositeFilter.java
@@ -17,6 +17,7 @@
 import android.text.TextUtils;
 import androidx.annotation.Nullable;
 import com.google.firebase.firestore.model.Document;
+import com.google.firebase.firestore.pipeline.BooleanExpr;
 import com.google.firebase.firestore.util.Function;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -167,6 +168,23 @@ public String getCanonicalId() {
     return builder.toString();
   }
 
+  @Override
+  BooleanExpr toPipelineExpr() {
+    BooleanExpr first = filters.get(0).toPipelineExpr();
+    BooleanExpr[] additional = new BooleanExpr[filters.size() - 1];
+    for (int i = 1, filtersSize = filters.size(); i < filtersSize; i++) {
+      additional[i - 1] = filters.get(i).toPipelineExpr();
+    }
+    switch (operator) {
+      case AND:
+        return BooleanExpr.and(first, additional);
+      case OR:
+        return BooleanExpr.or(first, additional);
+    }
+    // Handle OPERATOR_UNSPECIFIED and UNRECOGNIZED cases as needed
+    throw new IllegalArgumentException("Unsupported operator: " + operator);
+  }
+
   @Override
   public String toString() {
     return getCanonicalId();
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/core/FieldFilter.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/core/FieldFilter.java
index 6ebf26d0718..b702746f066 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/core/FieldFilter.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/core/FieldFilter.java
@@ -14,13 +14,23 @@
 
 package com.google.firebase.firestore.core;
 
+import static com.google.firebase.firestore.model.Values.isNanValue;
+import static com.google.firebase.firestore.pipeline.Expr.and;
+import static com.google.firebase.firestore.pipeline.Expr.ifError;
 import static com.google.firebase.firestore.util.Assert.hardAssert;
 
+import androidx.annotation.NonNull;
+
 import com.google.firebase.firestore.model.Document;
 import com.google.firebase.firestore.model.FieldPath;
 import com.google.firebase.firestore.model.Values;
+import com.google.firebase.firestore.pipeline.BooleanExpr;
+import com.google.firebase.firestore.pipeline.Expr;
+import com.google.firebase.firestore.pipeline.Field;
 import com.google.firebase.firestore.util.Assert;
 import com.google.firestore.v1.Value;
+
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
@@ -172,6 +182,76 @@ public List<Filter> getFilters() {
     return Collections.singletonList(this);
   }
 
+  @Override
+  BooleanExpr toPipelineExpr() {
+    Field x = new Field(field);
+    BooleanExpr exists = x.exists();
+    switch (operator) {
+      case LESS_THAN:
+        return and(exists, x.lt(value));
+      case LESS_THAN_OR_EQUAL:
+        return and(exists, x.lte(value));
+      case EQUAL:
+        if (value.hasNullValue()) {
+          return and(exists, x.isNull());
+        } else if (isNanValue(value)) {
+          // The isNan will error on non-numeric values.
+          return and(exists, ifError(x.isNan(), Expr.constant(false)));
+        } else {
+          return and(exists, x.eq(value));
+        }
+      case NOT_EQUAL:
+        if (value.hasNullValue()) {
+          return and(exists, x.isNotNull());
+        } else if (isNanValue(value)) {
+          // The isNotNan will error on non-numeric values.
+          return and(exists, ifError(x.isNotNan(), Expr.constant(true)));
+        } else {
+          return and(exists, x.neq(value));
+        }
+      case GREATER_THAN:
+        return and(exists, x.gt(value));
+      case GREATER_THAN_OR_EQUAL:
+        return and(exists, x.gte(value));
+      case ARRAY_CONTAINS:
+        return and(exists, x.arrayContains(value));
+      case ARRAY_CONTAINS_ANY:
+        return and(exists, x.arrayContainsAny(value.getArrayValue().getValuesList()));
+      case IN:
+        return and(exists, x.eqAny(value.getArrayValue().getValuesList()));
+      case NOT_IN: {
+        List<Value> list = value.getArrayValue().getValuesList();
+        if (hasNaN(list)) {
+          return and(exists, x.notEqAny(filterNaN(list)), ifError(x.isNotNan(), Expr.constant(true)));
+        } else {
+          return and(exists, x.notEqAny(list));
+        }
+      }
+      default:
+        // Handle OPERATOR_UNSPECIFIED and UNRECOGNIZED cases as needed
+        throw new IllegalArgumentException("Unsupported operator: " + operator);
+    }
+  }
+
+  private static boolean hasNaN(List<Value> list) {
+    for (Value v : list) {
+      if (isNanValue(v)) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  @NonNull
+  private static List<Value> filterNaN(List<Value> list) {
+    List<Value> listWithoutNan = new ArrayList<>(list.size() - 1);
+    for (Value v : list) {
+      if (isNanValue(v)) continue;
+      listWithoutNan.add(v);
+    }
+    return listWithoutNan;
+  }
+
   @Override
   public String toString() {
     return getCanonicalId();
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/core/Filter.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/core/Filter.java
index 063b994f7a8..3f33bd3d5bc 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/core/Filter.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/core/Filter.java
@@ -15,6 +15,7 @@
 package com.google.firebase.firestore.core;
 
 import com.google.firebase.firestore.model.Document;
+import com.google.firebase.firestore.pipeline.BooleanExpr;
 import java.util.List;
 
 public abstract class Filter {
@@ -29,4 +30,6 @@ public abstract class Filter {
 
   /** Returns a list of all filters that are contained within this filter */
   public abstract List<Filter> getFilters();
+
+  abstract BooleanExpr toPipelineExpr();
 }
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/core/FirestoreClient.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/core/FirestoreClient.java
index 6e2d9b87b84..d54e3458d52 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/core/FirestoreClient.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/core/FirestoreClient.java
@@ -27,6 +27,7 @@
 import com.google.firebase.firestore.FirebaseFirestoreException;
 import com.google.firebase.firestore.FirebaseFirestoreException.Code;
 import com.google.firebase.firestore.LoadBundleTask;
+import com.google.firebase.firestore.PipelineResultObserver;
 import com.google.firebase.firestore.TransactionOptions;
 import com.google.firebase.firestore.auth.CredentialsProvider;
 import com.google.firebase.firestore.auth.User;
@@ -49,6 +50,7 @@
 import com.google.firebase.firestore.util.AsyncQueue;
 import com.google.firebase.firestore.util.Function;
 import com.google.firebase.firestore.util.Logger;
+import com.google.firestore.v1.ExecutePipelineRequest;
 import com.google.firestore.v1.Value;
 import java.io.InputStream;
 import java.util.List;
@@ -249,6 +251,10 @@ public Task<Map<String, Value>> runAggregateQuery(
     return result.getTask();
   }
 
+  public void executePipeline(ExecutePipelineRequest request, PipelineResultObserver observer) {
+    asyncQueue.enqueueAndForget(() -> remoteStore.executePipeline(request, observer));
+  }
+
   /**
    * Returns a task resolves when all the pending writes at the time when this method is called
    * received server acknowledgement. An acknowledgement can be either acceptance or rejections.
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/core/OrderBy.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/core/OrderBy.java
index 8636fd0498a..1fd8a42ada5 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/core/OrderBy.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/core/OrderBy.java
@@ -21,7 +21,7 @@
 import com.google.firestore.v1.Value;
 
 /** Represents a sort order for a Firestore Query */
-public class OrderBy {
+public final class OrderBy {
   /** The direction of the ordering */
   public enum Direction {
     ASCENDING(1),
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/core/Query.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/core/Query.java
index bf57dfdb7a3..ac4d499854f 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/core/Query.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/core/Query.java
@@ -14,14 +14,34 @@
 
 package com.google.firebase.firestore.core;
 
+import static com.google.firebase.firestore.pipeline.Expr.and;
+import static com.google.firebase.firestore.pipeline.Expr.or;
 import static com.google.firebase.firestore.util.Assert.hardAssert;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import com.google.firebase.firestore.FirebaseFirestore;
+import com.google.firebase.firestore.Pipeline;
+import com.google.firebase.firestore.UserDataReader;
 import com.google.firebase.firestore.core.OrderBy.Direction;
 import com.google.firebase.firestore.model.Document;
 import com.google.firebase.firestore.model.DocumentKey;
 import com.google.firebase.firestore.model.FieldPath;
 import com.google.firebase.firestore.model.ResourcePath;
+import com.google.firebase.firestore.pipeline.BooleanExpr;
+import com.google.firebase.firestore.pipeline.CollectionGroupSource;
+import com.google.firebase.firestore.pipeline.CollectionSource;
+import com.google.firebase.firestore.pipeline.DocumentsSource;
+import com.google.firebase.firestore.pipeline.Expr;
+import com.google.firebase.firestore.pipeline.Field;
+import com.google.firebase.firestore.pipeline.FunctionExpr;
+import com.google.firebase.firestore.pipeline.InternalOptions;
+import com.google.firebase.firestore.pipeline.Ordering;
+import com.google.firebase.firestore.pipeline.BaseStage;
+import com.google.firebase.firestore.util.BiFunction;
+import com.google.firebase.firestore.util.Function;
+import com.google.firebase.firestore.util.IntFunction;
+import com.google.firestore.v1.Value;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
@@ -502,6 +522,115 @@ private synchronized Target toTarget(List<OrderBy> orderBys) {
     }
   }
 
+  @NonNull
+  public Pipeline toPipeline(FirebaseFirestore firestore, UserDataReader userDataReader) {
+    Pipeline p = new Pipeline(firestore, userDataReader, pipelineSource(firestore));
+
+    // Filters
+    for (Filter filter : filters) {
+      p = p.where(filter.toPipelineExpr());
+    }
+
+    // Orders
+    List<OrderBy> normalizedOrderBy = getNormalizedOrderBy();
+    int size = normalizedOrderBy.size();
+    List<Field> fields = new ArrayList<>(size);
+    List<Ordering> orderings = new ArrayList<>(size);
+    for (OrderBy order : normalizedOrderBy) {
+      Field field = new Field(order.getField());
+      fields.add(field);
+      if (order.getDirection() == Direction.ASCENDING) {
+        orderings.add(field.ascending());
+      } else {
+        orderings.add(field.descending());
+      }
+    }
+
+    if (fields.size() == 1) {
+      p = p.where(fields.get(0).exists());
+    } else {
+      BooleanExpr[] conditions = skipFirstToArray(fields, BooleanExpr[]::new, Expr.Companion::exists);
+      p = p.where(and(fields.get(0).exists(), conditions));
+    }
+
+    if (startAt != null) {
+      p = p.where(whereConditionsFromCursor(startAt, fields, FunctionExpr::gt));
+    }
+
+    if (endAt != null) {
+      p = p.where(whereConditionsFromCursor(endAt, fields, FunctionExpr::lt));
+    }
+
+    // Cursors, Limit, Offset
+    if (hasLimit()) {
+      // TODO: Handle situation where user enters limit larger than integer.
+      if (limitType == LimitType.LIMIT_TO_FIRST) {
+        p = p.sort(orderings.get(0), skipFirstToArray(orderings, Ordering[]::new));
+        p = p.limit((int) limit);
+      } else {
+        p =
+            p.sort(
+                orderings.get(0).reverse(),
+                skipFirstToArray(orderings, Ordering[]::new, Ordering::reverse));
+        p = p.limit((int) limit);
+        p = p.sort(orderings.get(0), skipFirstToArray(orderings, Ordering[]::new));
+      }
+    } else {
+      p = p.sort(orderings.get(0), skipFirstToArray(orderings, Ordering[]::new));
+    }
+
+    return p;
+  }
+
+  // Many Pipelines require first parameter to be separated out from rest.
+  private static <T> T[] skipFirstToArray(List<T> list, IntFunction<T[]> generator) {
+    int size = list.size();
+    T[] result = generator.apply(size - 1);
+    for (int i = 1; i < size; i++) {
+      result[i-1] = list.get(i);
+    }
+    return result;
+  }
+
+  // Many Pipelines require first parameter to be separated out from rest.
+  private static <T, R> R[] skipFirstToArray(List<T> list, IntFunction<R[]> generator, Function<T, R> map) {
+    int size = list.size();
+    R[] result = generator.apply(size - 1);
+    for (int i = 1; i < size; i++) {
+      result[i-1] = map.apply(list.get(i));
+    }
+    return result;
+  }
+
+  private static BooleanExpr whereConditionsFromCursor(
+      Bound bound, List<Field> fields, BiFunction<Expr, Object, BooleanExpr> cmp) {
+    List<Value> boundPosition = bound.getPosition();
+    int size = boundPosition.size();
+    hardAssert(size <= fields.size(), "Bound positions must not exceed order fields.");
+    int last = size - 1;
+    BooleanExpr condition = cmp.apply(fields.get(last), boundPosition.get(last));
+    if (bound.isInclusive()) {
+      condition = or(condition, Expr.eq(fields.get(last), boundPosition.get(last)));
+    }
+    for (int i = size - 2; i >= 0; i--) {
+      final Field field = fields.get(i);
+      final Value value = boundPosition.get(i);
+      condition = or(cmp.apply(field, value), and(field.eq(value), condition));
+    }
+    return condition;
+  }
+
+  @NonNull
+  private BaseStage<?> pipelineSource(FirebaseFirestore firestore) {
+    if (isDocumentQuery()) {
+      return new DocumentsSource(path.canonicalString());
+    } else if (isCollectionGroupQuery()) {
+      return CollectionGroupSource.of(collectionGroup);
+    } else {
+      return new CollectionSource(path.canonicalString(), firestore, InternalOptions.EMPTY);
+    }
+  }
+
   /**
    * This method is marked as synchronized because it modifies the internal state in some cases.
    *
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/model/BasePath.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/model/BasePath.java
index 66356e12595..6d800de05d4 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/model/BasePath.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/model/BasePath.java
@@ -19,19 +19,26 @@
 import androidx.annotation.NonNull;
 import com.google.firebase.firestore.util.Util;
 import java.util.ArrayList;
+import java.util.Iterator;
 import java.util.List;
 
 /**
  * BasePath represents a path sequence in the Firestore database. It is composed of an ordered
  * sequence of string segments.
  */
-public abstract class BasePath<B extends BasePath<B>> implements Comparable<B> {
+public abstract class BasePath<B extends BasePath<B>> implements Comparable<B>, Iterable<String> {
   final List<String> segments;
 
   BasePath(List<String> segments) {
     this.segments = segments;
   }
 
+  @NonNull
+  @Override
+  public Iterator<String> iterator() {
+    return segments.iterator();
+  }
+
   public String getSegment(int index) {
     return segments.get(index);
   }
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/model/FieldPath.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/model/FieldPath.java
index c1de25410fe..051dfce922b 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/model/FieldPath.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/model/FieldPath.java
@@ -14,6 +14,7 @@
 
 package com.google.firebase.firestore.model;
 
+import androidx.annotation.NonNull;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -34,7 +35,8 @@ public static FieldPath fromSingleSegment(String fieldName) {
   }
 
   /** Creates a {@code FieldPath} from a list of parsed field path segments. */
-  public static FieldPath fromSegments(List<String> segments) {
+  @NonNull
+  public static FieldPath fromSegments(@NonNull List<String> segments) {
     return segments.isEmpty() ? FieldPath.EMPTY_PATH : new FieldPath(segments);
   }
 
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/model/ObjectValue.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/model/ObjectValue.java
index a7ea2997618..581bbf8481b 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/model/ObjectValue.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/model/ObjectValue.java
@@ -47,9 +47,7 @@ public static ObjectValue fromMap(Map<String, Value> value) {
   }
 
   public ObjectValue(Value value) {
-    hardAssert(
-        value.getValueTypeCase() == Value.ValueTypeCase.MAP_VALUE,
-        "ObjectValues should be backed by a MapValue");
+    hardAssert(value.hasMapValue(), "ObjectValues should be backed by a MapValue");
     hardAssert(
         !ServerTimestamps.isServerTimestamp(value),
         "ServerTimestamps should not be used as an ObjectValue");
@@ -103,7 +101,7 @@ private FieldMask extractFieldMask(MapValue value) {
   }
 
   @Nullable
-  private Value extractNestedValue(Value value, FieldPath fieldPath) {
+  private static Value extractNestedValue(Value value, FieldPath fieldPath) {
     if (fieldPath.isEmpty()) {
       return value;
     } else {
@@ -180,8 +178,7 @@ private void setOverlay(FieldPath path, @Nullable Value value) {
       if (currentValue instanceof Map) {
         // Re-use a previously created map
         currentLevel = (Map<String, Object>) currentValue;
-      } else if (currentValue instanceof Value
-          && ((Value) currentValue).getValueTypeCase() == Value.ValueTypeCase.MAP_VALUE) {
+      } else if (currentValue instanceof Value && ((Value) currentValue).hasMapValue()) {
         // Convert the existing Protobuf MapValue into a Java map
         Map<String, Object> nextLevel =
             new HashMap<>(((Value) currentValue).getMapValue().getFieldsMap());
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/model/ResourcePath.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/model/ResourcePath.java
index c96fcbdc3ee..776953d55d2 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/model/ResourcePath.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/model/ResourcePath.java
@@ -14,6 +14,7 @@
 
 package com.google.firebase.firestore.model;
 
+import androidx.annotation.NonNull;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -36,7 +37,7 @@ public static ResourcePath fromSegments(List<String> segments) {
     return segments.isEmpty() ? ResourcePath.EMPTY : new ResourcePath(segments);
   }
 
-  public static ResourcePath fromString(String path) {
+  public static ResourcePath fromString(@NonNull String path) {
     // NOTE: The client is ignorant of any path segments containing escape
     // sequences (for example, __id123__) and just passes them through raw (they exist
     // for legacy reasons and should not be used frequently).
@@ -65,13 +66,6 @@ public String canonicalString() {
     // NOTE: The client is ignorant of any path segments containing escape
     // sequences (for example, __id123__) and just passes them through raw (they exist
     // for legacy reasons and should not be used frequently).
-    StringBuilder builder = new StringBuilder();
-    for (int i = 0; i < segments.size(); i++) {
-      if (i > 0) {
-        builder.append("/");
-      }
-      builder.append(segments.get(i));
-    }
-    return builder.toString();
+    return String.join("/", segments);
   }
 }
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/model/Values.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/model/Values.java
deleted file mode 100644
index 834fb2454a3..00000000000
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/model/Values.java
+++ /dev/null
@@ -1,615 +0,0 @@
-// Copyright 2020 Google LLC
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.firebase.firestore.model;
-
-import static com.google.firebase.firestore.model.ServerTimestamps.getLocalWriteTime;
-import static com.google.firebase.firestore.model.ServerTimestamps.isServerTimestamp;
-import static com.google.firebase.firestore.util.Assert.fail;
-import static com.google.firebase.firestore.util.Assert.hardAssert;
-
-import androidx.annotation.Nullable;
-import com.google.firebase.firestore.util.Util;
-import com.google.firestore.v1.ArrayValue;
-import com.google.firestore.v1.ArrayValueOrBuilder;
-import com.google.firestore.v1.MapValue;
-import com.google.firestore.v1.Value;
-import com.google.protobuf.ByteString;
-import com.google.protobuf.NullValue;
-import com.google.protobuf.Timestamp;
-import com.google.type.LatLng;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.Iterator;
-import java.util.List;
-import java.util.Map;
-import java.util.TreeMap;
-
-public class Values {
-  public static final String TYPE_KEY = "__type__";
-  public static final Value NAN_VALUE = Value.newBuilder().setDoubleValue(Double.NaN).build();
-  public static final Value NULL_VALUE =
-      Value.newBuilder().setNullValue(NullValue.NULL_VALUE).build();
-  public static final Value MIN_VALUE = NULL_VALUE;
-  public static final Value MAX_VALUE_TYPE = Value.newBuilder().setStringValue("__max__").build();
-  public static final Value MAX_VALUE =
-      Value.newBuilder()
-          .setMapValue(MapValue.newBuilder().putFields(TYPE_KEY, MAX_VALUE_TYPE))
-          .build();
-
-  public static final Value VECTOR_VALUE_TYPE =
-      Value.newBuilder().setStringValue("__vector__").build();
-  public static final String VECTOR_MAP_VECTORS_KEY = "value";
-  private static final Value MIN_VECTOR_VALUE =
-      Value.newBuilder()
-          .setMapValue(
-              MapValue.newBuilder()
-                  .putFields(TYPE_KEY, VECTOR_VALUE_TYPE)
-                  .putFields(
-                      VECTOR_MAP_VECTORS_KEY,
-                      Value.newBuilder().setArrayValue(ArrayValue.newBuilder()).build()))
-          .build();
-
-  /**
-   * The order of types in Firestore. This order is based on the backend's ordering, but modified to
-   * support server timestamps and {@link #MAX_VALUE}.
-   */
-  public static final int TYPE_ORDER_NULL = 0;
-
-  public static final int TYPE_ORDER_BOOLEAN = 1;
-  public static final int TYPE_ORDER_NUMBER = 2;
-  public static final int TYPE_ORDER_TIMESTAMP = 3;
-  public static final int TYPE_ORDER_SERVER_TIMESTAMP = 4;
-  public static final int TYPE_ORDER_STRING = 5;
-  public static final int TYPE_ORDER_BLOB = 6;
-  public static final int TYPE_ORDER_REFERENCE = 7;
-  public static final int TYPE_ORDER_GEOPOINT = 8;
-  public static final int TYPE_ORDER_ARRAY = 9;
-  public static final int TYPE_ORDER_VECTOR = 10;
-  public static final int TYPE_ORDER_MAP = 11;
-
-  public static final int TYPE_ORDER_MAX_VALUE = Integer.MAX_VALUE;
-
-  /** Returns the backend's type order of the given Value type. */
-  public static int typeOrder(Value value) {
-    switch (value.getValueTypeCase()) {
-      case NULL_VALUE:
-        return TYPE_ORDER_NULL;
-      case BOOLEAN_VALUE:
-        return TYPE_ORDER_BOOLEAN;
-      case INTEGER_VALUE:
-        return TYPE_ORDER_NUMBER;
-      case DOUBLE_VALUE:
-        return TYPE_ORDER_NUMBER;
-      case TIMESTAMP_VALUE:
-        return TYPE_ORDER_TIMESTAMP;
-      case STRING_VALUE:
-        return TYPE_ORDER_STRING;
-      case BYTES_VALUE:
-        return TYPE_ORDER_BLOB;
-      case REFERENCE_VALUE:
-        return TYPE_ORDER_REFERENCE;
-      case GEO_POINT_VALUE:
-        return TYPE_ORDER_GEOPOINT;
-      case ARRAY_VALUE:
-        return TYPE_ORDER_ARRAY;
-      case MAP_VALUE:
-        if (isServerTimestamp(value)) {
-          return TYPE_ORDER_SERVER_TIMESTAMP;
-        } else if (isMaxValue(value)) {
-          return TYPE_ORDER_MAX_VALUE;
-        } else if (isVectorValue(value)) {
-          return TYPE_ORDER_VECTOR;
-        } else {
-          return TYPE_ORDER_MAP;
-        }
-      default:
-        throw fail("Invalid value type: " + value.getValueTypeCase());
-    }
-  }
-
-  public static boolean equals(Value left, Value right) {
-    if (left == right) {
-      return true;
-    }
-
-    if (left == null || right == null) {
-      return false;
-    }
-
-    int leftType = typeOrder(left);
-    int rightType = typeOrder(right);
-    if (leftType != rightType) {
-      return false;
-    }
-
-    switch (leftType) {
-      case TYPE_ORDER_NUMBER:
-        return numberEquals(left, right);
-      case TYPE_ORDER_ARRAY:
-        return arrayEquals(left, right);
-      case TYPE_ORDER_VECTOR:
-      case TYPE_ORDER_MAP:
-        return objectEquals(left, right);
-      case TYPE_ORDER_SERVER_TIMESTAMP:
-        return getLocalWriteTime(left).equals(getLocalWriteTime(right));
-      case TYPE_ORDER_MAX_VALUE:
-        return true;
-      default:
-        return left.equals(right);
-    }
-  }
-
-  private static boolean numberEquals(Value left, Value right) {
-    if (left.getValueTypeCase() == Value.ValueTypeCase.INTEGER_VALUE
-        && right.getValueTypeCase() == Value.ValueTypeCase.INTEGER_VALUE) {
-      return left.getIntegerValue() == right.getIntegerValue();
-    } else if (left.getValueTypeCase() == Value.ValueTypeCase.DOUBLE_VALUE
-        && right.getValueTypeCase() == Value.ValueTypeCase.DOUBLE_VALUE) {
-      return Double.doubleToLongBits(left.getDoubleValue())
-          == Double.doubleToLongBits(right.getDoubleValue());
-    }
-
-    return false;
-  }
-
-  private static boolean arrayEquals(Value left, Value right) {
-    ArrayValue leftArray = left.getArrayValue();
-    ArrayValue rightArray = right.getArrayValue();
-
-    if (leftArray.getValuesCount() != rightArray.getValuesCount()) {
-      return false;
-    }
-
-    for (int i = 0; i < leftArray.getValuesCount(); ++i) {
-      if (!equals(leftArray.getValues(i), rightArray.getValues(i))) {
-        return false;
-      }
-    }
-
-    return true;
-  }
-
-  private static boolean objectEquals(Value left, Value right) {
-    MapValue leftMap = left.getMapValue();
-    MapValue rightMap = right.getMapValue();
-
-    if (leftMap.getFieldsCount() != rightMap.getFieldsCount()) {
-      return false;
-    }
-
-    for (Map.Entry<String, Value> entry : leftMap.getFieldsMap().entrySet()) {
-      Value otherEntry = rightMap.getFieldsMap().get(entry.getKey());
-      if (!equals(entry.getValue(), otherEntry)) {
-        return false;
-      }
-    }
-
-    return true;
-  }
-
-  /** Returns true if the Value list contains the specified element. */
-  public static boolean contains(ArrayValueOrBuilder haystack, Value needle) {
-    for (Value haystackElement : haystack.getValuesList()) {
-      if (equals(haystackElement, needle)) {
-        return true;
-      }
-    }
-    return false;
-  }
-
-  public static int compare(Value left, Value right) {
-    int leftType = typeOrder(left);
-    int rightType = typeOrder(right);
-
-    if (leftType != rightType) {
-      return Util.compareIntegers(leftType, rightType);
-    }
-
-    switch (leftType) {
-      case TYPE_ORDER_NULL:
-      case TYPE_ORDER_MAX_VALUE:
-        return 0;
-      case TYPE_ORDER_BOOLEAN:
-        return Util.compareBooleans(left.getBooleanValue(), right.getBooleanValue());
-      case TYPE_ORDER_NUMBER:
-        return compareNumbers(left, right);
-      case TYPE_ORDER_TIMESTAMP:
-        return compareTimestamps(left.getTimestampValue(), right.getTimestampValue());
-      case TYPE_ORDER_SERVER_TIMESTAMP:
-        return compareTimestamps(getLocalWriteTime(left), getLocalWriteTime(right));
-      case TYPE_ORDER_STRING:
-        return Util.compareUtf8Strings(left.getStringValue(), right.getStringValue());
-      case TYPE_ORDER_BLOB:
-        return Util.compareByteStrings(left.getBytesValue(), right.getBytesValue());
-      case TYPE_ORDER_REFERENCE:
-        return compareReferences(left.getReferenceValue(), right.getReferenceValue());
-      case TYPE_ORDER_GEOPOINT:
-        return compareGeoPoints(left.getGeoPointValue(), right.getGeoPointValue());
-      case TYPE_ORDER_ARRAY:
-        return compareArrays(left.getArrayValue(), right.getArrayValue());
-      case TYPE_ORDER_MAP:
-        return compareMaps(left.getMapValue(), right.getMapValue());
-      case TYPE_ORDER_VECTOR:
-        return compareVectors(left.getMapValue(), right.getMapValue());
-      default:
-        throw fail("Invalid value type: " + leftType);
-    }
-  }
-
-  public static int lowerBoundCompare(
-      Value left, boolean leftInclusive, Value right, boolean rightInclusive) {
-    int cmp = compare(left, right);
-    if (cmp != 0) {
-      return cmp;
-    }
-
-    if (leftInclusive && !rightInclusive) {
-      return -1;
-    } else if (!leftInclusive && rightInclusive) {
-      return 1;
-    }
-
-    return 0;
-  }
-
-  public static int upperBoundCompare(
-      Value left, boolean leftInclusive, Value right, boolean rightInclusive) {
-    int cmp = compare(left, right);
-    if (cmp != 0) {
-      return cmp;
-    }
-
-    if (leftInclusive && !rightInclusive) {
-      return 1;
-    } else if (!leftInclusive && rightInclusive) {
-      return -1;
-    }
-
-    return 0;
-  }
-
-  private static int compareNumbers(Value left, Value right) {
-    if (left.getValueTypeCase() == Value.ValueTypeCase.DOUBLE_VALUE) {
-      double leftDouble = left.getDoubleValue();
-      if (right.getValueTypeCase() == Value.ValueTypeCase.DOUBLE_VALUE) {
-        return Util.compareDoubles(leftDouble, right.getDoubleValue());
-      } else if (right.getValueTypeCase() == Value.ValueTypeCase.INTEGER_VALUE) {
-        return Util.compareMixed(leftDouble, right.getIntegerValue());
-      }
-    } else if (left.getValueTypeCase() == Value.ValueTypeCase.INTEGER_VALUE) {
-      long leftLong = left.getIntegerValue();
-      if (right.getValueTypeCase() == Value.ValueTypeCase.INTEGER_VALUE) {
-        return Util.compareLongs(leftLong, right.getIntegerValue());
-      } else if (right.getValueTypeCase() == Value.ValueTypeCase.DOUBLE_VALUE) {
-        return -1 * Util.compareMixed(right.getDoubleValue(), leftLong);
-      }
-    }
-
-    throw fail("Unexpected values: %s vs %s", left, right);
-  }
-
-  private static int compareTimestamps(Timestamp left, Timestamp right) {
-    int cmp = Util.compareLongs(left.getSeconds(), right.getSeconds());
-    if (cmp != 0) {
-      return cmp;
-    }
-    return Util.compareIntegers(left.getNanos(), right.getNanos());
-  }
-
-  private static int compareReferences(String leftPath, String rightPath) {
-    String[] leftSegments = leftPath.split("/", -1);
-    String[] rightSegments = rightPath.split("/", -1);
-
-    int minLength = Math.min(leftSegments.length, rightSegments.length);
-    for (int i = 0; i < minLength; i++) {
-      int cmp = leftSegments[i].compareTo(rightSegments[i]);
-      if (cmp != 0) {
-        return cmp;
-      }
-    }
-    return Util.compareIntegers(leftSegments.length, rightSegments.length);
-  }
-
-  private static int compareGeoPoints(LatLng left, LatLng right) {
-    int comparison = Util.compareDoubles(left.getLatitude(), right.getLatitude());
-    if (comparison == 0) {
-      return Util.compareDoubles(left.getLongitude(), right.getLongitude());
-    }
-    return comparison;
-  }
-
-  private static int compareArrays(ArrayValue left, ArrayValue right) {
-    int minLength = Math.min(left.getValuesCount(), right.getValuesCount());
-    for (int i = 0; i < minLength; i++) {
-      int cmp = compare(left.getValues(i), right.getValues(i));
-      if (cmp != 0) {
-        return cmp;
-      }
-    }
-    return Util.compareIntegers(left.getValuesCount(), right.getValuesCount());
-  }
-
-  private static int compareMaps(MapValue left, MapValue right) {
-    Iterator<Map.Entry<String, Value>> iterator1 =
-        new TreeMap<>(left.getFieldsMap()).entrySet().iterator();
-    Iterator<Map.Entry<String, Value>> iterator2 =
-        new TreeMap<>(right.getFieldsMap()).entrySet().iterator();
-    while (iterator1.hasNext() && iterator2.hasNext()) {
-      Map.Entry<String, Value> entry1 = iterator1.next();
-      Map.Entry<String, Value> entry2 = iterator2.next();
-      int keyCompare = Util.compareUtf8Strings(entry1.getKey(), entry2.getKey());
-      if (keyCompare != 0) {
-        return keyCompare;
-      }
-      int valueCompare = compare(entry1.getValue(), entry2.getValue());
-      if (valueCompare != 0) {
-        return valueCompare;
-      }
-    }
-
-    // Only equal if both iterators are exhausted.
-    return Util.compareBooleans(iterator1.hasNext(), iterator2.hasNext());
-  }
-
-  private static int compareVectors(MapValue left, MapValue right) {
-    Map<String, Value> leftMap = left.getFieldsMap();
-    Map<String, Value> rightMap = right.getFieldsMap();
-
-    // The vector is a map, but only vector value is compared.
-    ArrayValue leftArrayValue = leftMap.get(Values.VECTOR_MAP_VECTORS_KEY).getArrayValue();
-    ArrayValue rightArrayValue = rightMap.get(Values.VECTOR_MAP_VECTORS_KEY).getArrayValue();
-
-    int lengthCompare =
-        Util.compareIntegers(leftArrayValue.getValuesCount(), rightArrayValue.getValuesCount());
-    if (lengthCompare != 0) {
-      return lengthCompare;
-    }
-
-    return compareArrays(leftArrayValue, rightArrayValue);
-  }
-
-  /** Generate the canonical ID for the provided field value (as used in Target serialization). */
-  public static String canonicalId(Value value) {
-    StringBuilder builder = new StringBuilder();
-    canonifyValue(builder, value);
-    return builder.toString();
-  }
-
-  private static void canonifyValue(StringBuilder builder, Value value) {
-    switch (value.getValueTypeCase()) {
-      case NULL_VALUE:
-        builder.append("null");
-        break;
-      case BOOLEAN_VALUE:
-        builder.append(value.getBooleanValue());
-        break;
-      case INTEGER_VALUE:
-        builder.append(value.getIntegerValue());
-        break;
-      case DOUBLE_VALUE:
-        builder.append(value.getDoubleValue());
-        break;
-      case TIMESTAMP_VALUE:
-        canonifyTimestamp(builder, value.getTimestampValue());
-        break;
-      case STRING_VALUE:
-        builder.append(value.getStringValue());
-        break;
-      case BYTES_VALUE:
-        builder.append(Util.toDebugString(value.getBytesValue()));
-        break;
-      case REFERENCE_VALUE:
-        canonifyReference(builder, value);
-        break;
-      case GEO_POINT_VALUE:
-        canonifyGeoPoint(builder, value.getGeoPointValue());
-        break;
-      case ARRAY_VALUE:
-        canonifyArray(builder, value.getArrayValue());
-        break;
-      case MAP_VALUE:
-        canonifyObject(builder, value.getMapValue());
-        break;
-      default:
-        throw fail("Invalid value type: " + value.getValueTypeCase());
-    }
-  }
-
-  private static void canonifyTimestamp(StringBuilder builder, Timestamp timestamp) {
-    builder.append(String.format("time(%s,%s)", timestamp.getSeconds(), timestamp.getNanos()));
-  }
-
-  private static void canonifyGeoPoint(StringBuilder builder, LatLng latLng) {
-    builder.append(String.format("geo(%s,%s)", latLng.getLatitude(), latLng.getLongitude()));
-  }
-
-  private static void canonifyReference(StringBuilder builder, Value value) {
-    hardAssert(isReferenceValue(value), "Value should be a ReferenceValue");
-    builder.append(DocumentKey.fromName(value.getReferenceValue()));
-  }
-
-  private static void canonifyObject(StringBuilder builder, MapValue mapValue) {
-    // Even though MapValue are likely sorted correctly based on their insertion order (for example,
-    // when received from the backend), local modifications can bring elements out of order. We need
-    // to re-sort the elements to ensure that canonical IDs are independent of insertion order.
-    List<String> keys = new ArrayList<>(mapValue.getFieldsMap().keySet());
-    Collections.sort(keys);
-
-    builder.append("{");
-    boolean first = true;
-    for (String key : keys) {
-      if (!first) {
-        builder.append(",");
-      } else {
-        first = false;
-      }
-      builder.append(key).append(":");
-      canonifyValue(builder, mapValue.getFieldsOrThrow(key));
-    }
-    builder.append("}");
-  }
-
-  private static void canonifyArray(StringBuilder builder, ArrayValue arrayValue) {
-    builder.append("[");
-    for (int i = 0; i < arrayValue.getValuesCount(); ++i) {
-      canonifyValue(builder, arrayValue.getValues(i));
-      if (i != arrayValue.getValuesCount() - 1) {
-        builder.append(",");
-      }
-    }
-    builder.append("]");
-  }
-
-  /** Returns true if `value` is a INTEGER_VALUE. */
-  public static boolean isInteger(@Nullable Value value) {
-    return value != null && value.getValueTypeCase() == Value.ValueTypeCase.INTEGER_VALUE;
-  }
-
-  /** Returns true if `value` is a DOUBLE_VALUE. */
-  public static boolean isDouble(@Nullable Value value) {
-    return value != null && value.getValueTypeCase() == Value.ValueTypeCase.DOUBLE_VALUE;
-  }
-
-  /** Returns true if `value` is either a INTEGER_VALUE or a DOUBLE_VALUE. */
-  public static boolean isNumber(@Nullable Value value) {
-    return isInteger(value) || isDouble(value);
-  }
-
-  /** Returns true if `value` is an ARRAY_VALUE. */
-  public static boolean isArray(@Nullable Value value) {
-    return value != null && value.getValueTypeCase() == Value.ValueTypeCase.ARRAY_VALUE;
-  }
-
-  public static boolean isReferenceValue(@Nullable Value value) {
-    return value != null && value.getValueTypeCase() == Value.ValueTypeCase.REFERENCE_VALUE;
-  }
-
-  public static boolean isNullValue(@Nullable Value value) {
-    return value != null && value.getValueTypeCase() == Value.ValueTypeCase.NULL_VALUE;
-  }
-
-  public static boolean isNanValue(@Nullable Value value) {
-    return value != null && Double.isNaN(value.getDoubleValue());
-  }
-
-  public static boolean isMapValue(@Nullable Value value) {
-    return value != null && value.getValueTypeCase() == Value.ValueTypeCase.MAP_VALUE;
-  }
-
-  public static Value refValue(DatabaseId databaseId, DocumentKey key) {
-    Value value =
-        Value.newBuilder()
-            .setReferenceValue(
-                String.format(
-                    "projects/%s/databases/%s/documents/%s",
-                    databaseId.getProjectId(), databaseId.getDatabaseId(), key.toString()))
-            .build();
-    return value;
-  }
-
-  public static Value MIN_BOOLEAN = Value.newBuilder().setBooleanValue(false).build();
-  public static Value MIN_NUMBER = Value.newBuilder().setDoubleValue(Double.NaN).build();
-  public static Value MIN_TIMESTAMP =
-      Value.newBuilder()
-          .setTimestampValue(Timestamp.newBuilder().setSeconds(Long.MIN_VALUE))
-          .build();
-  public static Value MIN_STRING = Value.newBuilder().setStringValue("").build();
-  public static Value MIN_BYTES = Value.newBuilder().setBytesValue(ByteString.EMPTY).build();
-  public static Value MIN_REFERENCE = refValue(DatabaseId.EMPTY, DocumentKey.empty());
-  public static Value MIN_GEO_POINT =
-      Value.newBuilder()
-          .setGeoPointValue(LatLng.newBuilder().setLatitude(-90.0).setLongitude(-180.0))
-          .build();
-  public static Value MIN_ARRAY =
-      Value.newBuilder().setArrayValue(ArrayValue.getDefaultInstance()).build();
-  public static Value MIN_MAP =
-      Value.newBuilder().setMapValue(MapValue.getDefaultInstance()).build();
-
-  /** Returns the lowest value for the given value type (inclusive). */
-  public static Value getLowerBound(Value value) {
-    switch (value.getValueTypeCase()) {
-      case NULL_VALUE:
-        return Values.NULL_VALUE;
-      case BOOLEAN_VALUE:
-        return MIN_BOOLEAN;
-      case INTEGER_VALUE:
-      case DOUBLE_VALUE:
-        return MIN_NUMBER;
-      case TIMESTAMP_VALUE:
-        return MIN_TIMESTAMP;
-      case STRING_VALUE:
-        return MIN_STRING;
-      case BYTES_VALUE:
-        return MIN_BYTES;
-      case REFERENCE_VALUE:
-        return MIN_REFERENCE;
-      case GEO_POINT_VALUE:
-        return MIN_GEO_POINT;
-      case ARRAY_VALUE:
-        return MIN_ARRAY;
-      case MAP_VALUE:
-        // VectorValue sorts after ArrayValue and before an empty MapValue
-        if (isVectorValue(value)) {
-          return MIN_VECTOR_VALUE;
-        }
-        return MIN_MAP;
-      default:
-        throw new IllegalArgumentException("Unknown value type: " + value.getValueTypeCase());
-    }
-  }
-
-  /** Returns the largest value for the given value type (exclusive). */
-  public static Value getUpperBound(Value value) {
-    switch (value.getValueTypeCase()) {
-      case NULL_VALUE:
-        return MIN_BOOLEAN;
-      case BOOLEAN_VALUE:
-        return MIN_NUMBER;
-      case INTEGER_VALUE:
-      case DOUBLE_VALUE:
-        return MIN_TIMESTAMP;
-      case TIMESTAMP_VALUE:
-        return MIN_STRING;
-      case STRING_VALUE:
-        return MIN_BYTES;
-      case BYTES_VALUE:
-        return MIN_REFERENCE;
-      case REFERENCE_VALUE:
-        return MIN_GEO_POINT;
-      case GEO_POINT_VALUE:
-        return MIN_ARRAY;
-      case ARRAY_VALUE:
-        return MIN_VECTOR_VALUE;
-      case MAP_VALUE:
-        // VectorValue sorts after ArrayValue and before an empty MapValue
-        if (isVectorValue(value)) {
-          return MIN_MAP;
-        }
-        return MAX_VALUE;
-      default:
-        throw new IllegalArgumentException("Unknown value type: " + value.getValueTypeCase());
-    }
-  }
-
-  /** Returns true if the Value represents the canonical {@link #MAX_VALUE} . */
-  public static boolean isMaxValue(Value value) {
-    return MAX_VALUE_TYPE.equals(value.getMapValue().getFieldsMap().get(TYPE_KEY));
-  }
-
-  /** Returns true if the Value represents a VectorValue . */
-  public static boolean isVectorValue(Value value) {
-    return VECTOR_VALUE_TYPE.equals(value.getMapValue().getFieldsMap().get(TYPE_KEY));
-  }
-}
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/model/Values.kt b/firebase-firestore/src/main/java/com/google/firebase/firestore/model/Values.kt
new file mode 100644
index 00000000000..568a64899ec
--- /dev/null
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/model/Values.kt
@@ -0,0 +1,670 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package com.google.firebase.firestore.model
+
+import com.google.firebase.firestore.Blob
+import com.google.firebase.firestore.DocumentReference
+import com.google.firebase.firestore.GeoPoint
+import com.google.firebase.firestore.VectorValue
+import com.google.firebase.firestore.util.Assert
+import com.google.firebase.firestore.util.Util
+import com.google.firestore.v1.ArrayValue
+import com.google.firestore.v1.ArrayValueOrBuilder
+import com.google.firestore.v1.MapValue
+import com.google.firestore.v1.Value
+import com.google.firestore.v1.Value.ValueTypeCase
+import com.google.protobuf.ByteString
+import com.google.protobuf.NullValue
+import com.google.protobuf.Timestamp
+import com.google.type.LatLng
+import java.lang.Double.doubleToLongBits
+import java.util.Date
+import java.util.TreeMap
+import kotlin.math.min
+
+internal object Values {
+  const val TYPE_KEY: String = "__type__"
+  @JvmField val NAN_VALUE: Value = Value.newBuilder().setDoubleValue(Double.NaN).build()
+  @JvmField val NULL_VALUE: Value = Value.newBuilder().setNullValue(NullValue.NULL_VALUE).build()
+  @JvmField val MIN_VALUE: Value = NULL_VALUE
+  @JvmField val MAX_VALUE_TYPE: Value = Value.newBuilder().setStringValue("__max__").build()
+  @JvmField
+  val MAX_VALUE: Value =
+    Value.newBuilder()
+      .setMapValue(MapValue.newBuilder().putFields(TYPE_KEY, MAX_VALUE_TYPE))
+      .build()
+
+  @JvmField val VECTOR_VALUE_TYPE: Value = Value.newBuilder().setStringValue("__vector__").build()
+  const val VECTOR_MAP_VECTORS_KEY: String = "value"
+  private val MIN_VECTOR_VALUE: Value =
+    Value.newBuilder()
+      .setMapValue(
+        MapValue.newBuilder()
+          .putFields(TYPE_KEY, VECTOR_VALUE_TYPE)
+          .putFields(
+            VECTOR_MAP_VECTORS_KEY,
+            Value.newBuilder().setArrayValue(ArrayValue.newBuilder()).build()
+          )
+      )
+      .build()
+
+  /**
+   * The order of types in Firestore. This order is based on the backend's ordering, but modified to
+   * support server timestamps and [.MAX_VALUE].
+   */
+  const val TYPE_ORDER_NULL: Int = 0
+
+  const val TYPE_ORDER_BOOLEAN: Int = 1
+  const val TYPE_ORDER_NUMBER: Int = 2
+  const val TYPE_ORDER_TIMESTAMP: Int = 3
+  const val TYPE_ORDER_SERVER_TIMESTAMP: Int = 4
+  const val TYPE_ORDER_STRING: Int = 5
+  const val TYPE_ORDER_BLOB: Int = 6
+  const val TYPE_ORDER_REFERENCE: Int = 7
+  const val TYPE_ORDER_GEOPOINT: Int = 8
+  const val TYPE_ORDER_ARRAY: Int = 9
+  const val TYPE_ORDER_VECTOR: Int = 10
+  const val TYPE_ORDER_MAP: Int = 11
+
+  const val TYPE_ORDER_MAX_VALUE: Int = Int.MAX_VALUE
+
+  /** Returns the backend's type order of the given Value type. */
+  @JvmStatic
+  fun typeOrder(value: Value): Int {
+    return when (value.valueTypeCase) {
+      ValueTypeCase.NULL_VALUE -> TYPE_ORDER_NULL
+      ValueTypeCase.BOOLEAN_VALUE -> TYPE_ORDER_BOOLEAN
+      ValueTypeCase.INTEGER_VALUE -> TYPE_ORDER_NUMBER
+      ValueTypeCase.DOUBLE_VALUE -> TYPE_ORDER_NUMBER
+      ValueTypeCase.TIMESTAMP_VALUE -> TYPE_ORDER_TIMESTAMP
+      ValueTypeCase.STRING_VALUE -> TYPE_ORDER_STRING
+      ValueTypeCase.BYTES_VALUE -> TYPE_ORDER_BLOB
+      ValueTypeCase.REFERENCE_VALUE -> TYPE_ORDER_REFERENCE
+      ValueTypeCase.GEO_POINT_VALUE -> TYPE_ORDER_GEOPOINT
+      ValueTypeCase.ARRAY_VALUE -> TYPE_ORDER_ARRAY
+      ValueTypeCase.MAP_VALUE ->
+        if (ServerTimestamps.isServerTimestamp(value)) {
+          TYPE_ORDER_SERVER_TIMESTAMP
+        } else if (isMaxValue(value)) {
+          TYPE_ORDER_MAX_VALUE
+        } else if (isVectorValue(value)) {
+          TYPE_ORDER_VECTOR
+        } else {
+          TYPE_ORDER_MAP
+        }
+      else -> throw Assert.fail("Invalid value type: " + value.valueTypeCase)
+    }
+  }
+
+  @JvmStatic
+  fun equals(left: Value?, right: Value?): Boolean {
+    if (left === right) {
+      return true
+    }
+
+    if (left == null || right == null) {
+      return false
+    }
+
+    val leftType = typeOrder(left)
+    val rightType = typeOrder(right)
+    if (leftType != rightType) {
+      return false
+    }
+
+    return when (leftType) {
+      TYPE_ORDER_NUMBER -> numberEquals(left, right)
+      TYPE_ORDER_ARRAY -> arrayEquals(left, right)
+      TYPE_ORDER_VECTOR,
+      TYPE_ORDER_MAP -> objectEquals(left, right)
+      TYPE_ORDER_SERVER_TIMESTAMP ->
+        ServerTimestamps.getLocalWriteTime(left) == ServerTimestamps.getLocalWriteTime(right)
+      TYPE_ORDER_MAX_VALUE -> true
+      else -> left == right
+    }
+  }
+
+  private fun numberEquals(left: Value, right: Value): Boolean {
+    if (left.valueTypeCase != right.valueTypeCase) {
+      return false
+    }
+    return when (left.valueTypeCase) {
+      ValueTypeCase.INTEGER_VALUE -> left.integerValue == right.integerValue
+      ValueTypeCase.DOUBLE_VALUE ->
+        doubleToLongBits(left.doubleValue) == doubleToLongBits(right.doubleValue)
+      else -> false
+    }
+  }
+
+  private fun arrayEquals(left: Value, right: Value): Boolean {
+    val leftArray = left.arrayValue
+    val rightArray = right.arrayValue
+
+    if (leftArray.valuesCount != rightArray.valuesCount) {
+      return false
+    }
+
+    for (i in 0 until leftArray.valuesCount) {
+      if (!equals(leftArray.getValues(i), rightArray.getValues(i))) {
+        return false
+      }
+    }
+
+    return true
+  }
+
+  private fun objectEquals(left: Value, right: Value): Boolean {
+    val leftMap = left.mapValue
+    val rightMap = right.mapValue
+
+    if (leftMap.fieldsCount != rightMap.fieldsCount) {
+      return false
+    }
+
+    for ((key, value) in leftMap.fieldsMap) {
+      val otherEntry = rightMap.fieldsMap[key]
+      if (!equals(value, otherEntry)) {
+        return false
+      }
+    }
+
+    return true
+  }
+
+  /** Returns true if the Value list contains the specified element. */
+  @JvmStatic
+  fun contains(haystack: ArrayValueOrBuilder, needle: Value?): Boolean {
+    for (haystackElement in haystack.valuesList) {
+      if (equals(haystackElement, needle)) {
+        return true
+      }
+    }
+    return false
+  }
+
+  @JvmStatic
+  fun compare(left: Value, right: Value): Int {
+    val leftType = typeOrder(left)
+    val rightType = typeOrder(right)
+
+    if (leftType != rightType) {
+      return Util.compareIntegers(leftType, rightType)
+    }
+
+    return when (leftType) {
+      TYPE_ORDER_NULL,
+      TYPE_ORDER_MAX_VALUE -> 0
+      TYPE_ORDER_BOOLEAN -> Util.compareBooleans(left.booleanValue, right.booleanValue)
+      TYPE_ORDER_NUMBER -> compareNumbers(left, right)
+      TYPE_ORDER_TIMESTAMP -> compareTimestamps(left.timestampValue, right.timestampValue)
+      TYPE_ORDER_SERVER_TIMESTAMP ->
+        compareTimestamps(
+          ServerTimestamps.getLocalWriteTime(left),
+          ServerTimestamps.getLocalWriteTime(right)
+        )
+      TYPE_ORDER_STRING -> Util.compareUtf8Strings(left.stringValue, right.stringValue)
+      TYPE_ORDER_BLOB -> Util.compareByteStrings(left.bytesValue, right.bytesValue)
+      TYPE_ORDER_REFERENCE -> compareReferences(left.referenceValue, right.referenceValue)
+      TYPE_ORDER_GEOPOINT -> compareGeoPoints(left.geoPointValue, right.geoPointValue)
+      TYPE_ORDER_ARRAY -> compareArrays(left.arrayValue, right.arrayValue)
+      TYPE_ORDER_MAP -> compareMaps(left.mapValue, right.mapValue)
+      TYPE_ORDER_VECTOR -> compareVectors(left.mapValue, right.mapValue)
+      else -> throw Assert.fail("Invalid value type: $leftType")
+    }
+  }
+
+  @JvmStatic
+  fun lowerBoundCompare(
+    left: Value,
+    leftInclusive: Boolean,
+    right: Value,
+    rightInclusive: Boolean
+  ): Int {
+    val cmp = compare(left, right)
+    if (cmp != 0) {
+      return cmp
+    }
+
+    if (leftInclusive && !rightInclusive) {
+      return -1
+    } else if (!leftInclusive && rightInclusive) {
+      return 1
+    }
+
+    return 0
+  }
+
+  @JvmStatic
+  fun upperBoundCompare(
+    left: Value,
+    leftInclusive: Boolean,
+    right: Value,
+    rightInclusive: Boolean
+  ): Int {
+    val cmp = compare(left, right)
+    if (cmp != 0) {
+      return cmp
+    }
+
+    if (leftInclusive && !rightInclusive) {
+      return 1
+    } else if (!leftInclusive && rightInclusive) {
+      return -1
+    }
+
+    return 0
+  }
+
+  private fun compareNumbers(left: Value, right: Value): Int {
+    if (left.hasDoubleValue()) {
+      if (right.hasDoubleValue()) {
+        return Util.compareDoubles(left.doubleValue, right.doubleValue)
+      } else if (right.hasIntegerValue()) {
+        return Util.compareMixed(left.doubleValue, right.integerValue)
+      }
+    } else if (left.hasIntegerValue()) {
+      if (right.hasIntegerValue()) {
+        return Util.compareLongs(left.integerValue, right.integerValue)
+      } else if (right.hasDoubleValue()) {
+        return -1 * Util.compareMixed(right.doubleValue, left.integerValue)
+      }
+    }
+
+    throw Assert.fail("Unexpected values: %s vs %s", left, right)
+  }
+
+  private fun compareTimestamps(left: Timestamp, right: Timestamp): Int {
+    val cmp = Util.compareLongs(left.seconds, right.seconds)
+    if (cmp != 0) {
+      return cmp
+    }
+    return Util.compareIntegers(left.nanos, right.nanos)
+  }
+
+  private fun compareReferences(leftPath: String, rightPath: String): Int {
+    val leftSegments = leftPath.split("/".toRegex()).toTypedArray()
+    val rightSegments = rightPath.split("/".toRegex()).toTypedArray()
+
+    val minLength = min(leftSegments.size.toDouble(), rightSegments.size.toDouble()).toInt()
+    for (i in 0 until minLength) {
+      val cmp = leftSegments[i].compareTo(rightSegments[i])
+      if (cmp != 0) {
+        return cmp
+      }
+    }
+    return Util.compareIntegers(leftSegments.size, rightSegments.size)
+  }
+
+  private fun compareGeoPoints(left: LatLng, right: LatLng): Int {
+    val comparison = Util.compareDoubles(left.latitude, right.latitude)
+    if (comparison == 0) {
+      return Util.compareDoubles(left.longitude, right.longitude)
+    }
+    return comparison
+  }
+
+  private fun compareArrays(left: ArrayValue, right: ArrayValue): Int {
+    val minLength = min(left.valuesCount.toDouble(), right.valuesCount.toDouble()).toInt()
+    for (i in 0 until minLength) {
+      val cmp = compare(left.getValues(i), right.getValues(i))
+      if (cmp != 0) {
+        return cmp
+      }
+    }
+    return Util.compareIntegers(left.valuesCount, right.valuesCount)
+  }
+
+  private fun compareMaps(left: MapValue, right: MapValue): Int {
+    val iterator1: Iterator<Map.Entry<String, Value>> = TreeMap(left.fieldsMap).entries.iterator()
+    val iterator2: Iterator<Map.Entry<String, Value>> = TreeMap(right.fieldsMap).entries.iterator()
+    while (iterator1.hasNext() && iterator2.hasNext()) {
+      val entry1 = iterator1.next()
+      val entry2 = iterator2.next()
+      val keyCompare = Util.compareUtf8Strings(entry1.key, entry2.key)
+      if (keyCompare != 0) {
+        return keyCompare
+      }
+      val valueCompare = compare(entry1.value, entry2.value)
+      if (valueCompare != 0) {
+        return valueCompare
+      }
+    }
+
+    // Only equal if both iterators are exhausted.
+    return Util.compareBooleans(iterator1.hasNext(), iterator2.hasNext())
+  }
+
+  private fun compareVectors(left: MapValue, right: MapValue): Int {
+    val leftMap = left.fieldsMap
+    val rightMap = right.fieldsMap
+
+    // The vector is a map, but only vector value is compared.
+    val leftArrayValue = leftMap[VECTOR_MAP_VECTORS_KEY]!!.arrayValue
+    val rightArrayValue = rightMap[VECTOR_MAP_VECTORS_KEY]!!.arrayValue
+
+    val lengthCompare =
+      Util.compareIntegers(leftArrayValue.valuesCount, rightArrayValue.valuesCount)
+    if (lengthCompare != 0) {
+      return lengthCompare
+    }
+
+    return compareArrays(leftArrayValue, rightArrayValue)
+  }
+
+  /** Generate the canonical ID for the provided field value (as used in Target serialization). */
+  @JvmStatic
+  fun canonicalId(value: Value): String {
+    val builder = StringBuilder()
+    canonifyValue(builder, value)
+    return builder.toString()
+  }
+
+  private fun canonifyValue(builder: StringBuilder, value: Value) {
+    when (value.valueTypeCase) {
+      ValueTypeCase.NULL_VALUE -> builder.append("null")
+      ValueTypeCase.BOOLEAN_VALUE -> builder.append(value.booleanValue)
+      ValueTypeCase.INTEGER_VALUE -> builder.append(value.integerValue)
+      ValueTypeCase.DOUBLE_VALUE -> builder.append(value.doubleValue)
+      ValueTypeCase.TIMESTAMP_VALUE -> canonifyTimestamp(builder, value.timestampValue)
+      ValueTypeCase.STRING_VALUE -> builder.append(value.stringValue)
+      ValueTypeCase.BYTES_VALUE -> builder.append(Util.toDebugString(value.bytesValue))
+      ValueTypeCase.REFERENCE_VALUE -> canonifyReference(builder, value)
+      ValueTypeCase.GEO_POINT_VALUE -> canonifyGeoPoint(builder, value.geoPointValue)
+      ValueTypeCase.ARRAY_VALUE -> canonifyArray(builder, value.arrayValue)
+      ValueTypeCase.MAP_VALUE -> canonifyObject(builder, value.mapValue)
+      else -> throw Assert.fail("Invalid value type: " + value.valueTypeCase)
+    }
+  }
+
+  private fun canonifyTimestamp(builder: StringBuilder, timestamp: Timestamp) {
+    builder.append(String.format("time(%s,%s)", timestamp.seconds, timestamp.nanos))
+  }
+
+  private fun canonifyGeoPoint(builder: StringBuilder, latLng: LatLng) {
+    builder.append(String.format("geo(%s,%s)", latLng.latitude, latLng.longitude))
+  }
+
+  private fun canonifyReference(builder: StringBuilder, value: Value) {
+    Assert.hardAssert(isReferenceValue(value), "Value should be a ReferenceValue")
+    builder.append(DocumentKey.fromName(value.referenceValue))
+  }
+
+  private fun canonifyObject(builder: StringBuilder, mapValue: MapValue) {
+    // Even though MapValue are likely sorted correctly based on their insertion order (for example,
+    // when received from the backend), local modifications can bring elements out of order. We need
+    // to re-sort the elements to ensure that canonical IDs are independent of insertion order.
+    val keys = ArrayList(mapValue.fieldsMap.keys)
+    keys.sort()
+
+    builder.append("{")
+    val iterator = keys.iterator()
+    while (iterator.hasNext()) {
+      val key = iterator.next()
+      builder.append(key).append(":")
+      canonifyValue(builder, mapValue.getFieldsOrThrow(key))
+      if (iterator.hasNext()) {
+        builder.append(",")
+      }
+    }
+    builder.append("}")
+  }
+
+  private fun canonifyArray(builder: StringBuilder, arrayValue: ArrayValue) {
+    builder.append("[")
+    if (arrayValue.valuesCount > 0) {
+      canonifyValue(builder, arrayValue.getValues(0))
+      for (i in 1 until arrayValue.valuesCount) {
+        builder.append(",")
+        canonifyValue(builder, arrayValue.getValues(i))
+      }
+    }
+    builder.append("]")
+  }
+
+  /** Returns true if `value` is a INTEGER_VALUE. */
+  @JvmStatic
+  fun isInteger(value: Value?): Boolean {
+    return value != null && value.hasIntegerValue()
+  }
+
+  /** Returns true if `value` is a DOUBLE_VALUE. */
+  @JvmStatic
+  fun isDouble(value: Value?): Boolean {
+    return value != null && value.hasDoubleValue()
+  }
+
+  /** Returns true if `value` is either a INTEGER_VALUE or a DOUBLE_VALUE. */
+  @JvmStatic
+  fun isNumber(value: Value?): Boolean {
+    return isInteger(value) || isDouble(value)
+  }
+
+  /** Returns true if `value` is an ARRAY_VALUE. */
+  @JvmStatic
+  fun isArray(value: Value?): Boolean {
+    return value != null && value.hasArrayValue()
+  }
+
+  @JvmStatic
+  fun isReferenceValue(value: Value?): Boolean {
+    return value != null && value.hasReferenceValue()
+  }
+
+  @JvmStatic
+  fun isNullValue(value: Value?): Boolean {
+    return value != null && value.hasNullValue()
+  }
+
+  @JvmStatic
+  fun isNanValue(value: Value?): Boolean {
+    return value != null && java.lang.Double.isNaN(value.doubleValue)
+  }
+
+  @JvmStatic
+  fun isMapValue(value: Value?): Boolean {
+    return value != null && value.hasMapValue()
+  }
+
+  @JvmStatic
+  fun refValue(databaseId: DatabaseId, key: DocumentKey): Value {
+    val value =
+      Value.newBuilder()
+        .setReferenceValue(
+          String.format(
+            "projects/%s/databases/%s/documents/%s",
+            databaseId.projectId,
+            databaseId.databaseId,
+            key.toString()
+          )
+        )
+        .build()
+    return value
+  }
+
+  private val MIN_BOOLEAN: Value = Value.newBuilder().setBooleanValue(false).build()
+  private val MIN_NUMBER: Value = Value.newBuilder().setDoubleValue(Double.NaN).build()
+  private val MIN_TIMESTAMP: Value =
+    Value.newBuilder().setTimestampValue(Timestamp.newBuilder().setSeconds(Long.MIN_VALUE)).build()
+  private val MIN_STRING: Value = Value.newBuilder().setStringValue("").build()
+  private val MIN_BYTES: Value = Value.newBuilder().setBytesValue(ByteString.EMPTY).build()
+  private val MIN_REFERENCE: Value = refValue(DatabaseId.EMPTY, DocumentKey.empty())
+  private val MIN_GEO_POINT: Value =
+    Value.newBuilder()
+      .setGeoPointValue(LatLng.newBuilder().setLatitude(-90.0).setLongitude(-180.0))
+      .build()
+  private val MIN_ARRAY: Value =
+    Value.newBuilder().setArrayValue(ArrayValue.getDefaultInstance()).build()
+  private val MIN_MAP: Value = Value.newBuilder().setMapValue(MapValue.getDefaultInstance()).build()
+
+  /** Returns the lowest value for the given value type (inclusive). */
+  @JvmStatic
+  fun getLowerBound(value: Value): Value {
+    return when (value.valueTypeCase) {
+      ValueTypeCase.NULL_VALUE -> NULL_VALUE
+      ValueTypeCase.BOOLEAN_VALUE -> MIN_BOOLEAN
+      ValueTypeCase.INTEGER_VALUE,
+      ValueTypeCase.DOUBLE_VALUE -> MIN_NUMBER
+      ValueTypeCase.TIMESTAMP_VALUE -> MIN_TIMESTAMP
+      ValueTypeCase.STRING_VALUE -> MIN_STRING
+      ValueTypeCase.BYTES_VALUE -> MIN_BYTES
+      ValueTypeCase.REFERENCE_VALUE -> MIN_REFERENCE
+      ValueTypeCase.GEO_POINT_VALUE -> MIN_GEO_POINT
+      ValueTypeCase.ARRAY_VALUE -> MIN_ARRAY
+      // VectorValue sorts after ArrayValue and before an empty MapValue
+      ValueTypeCase.MAP_VALUE -> if (isVectorValue(value)) MIN_VECTOR_VALUE else MIN_MAP
+      else -> throw IllegalArgumentException("Unknown value type: " + value.valueTypeCase)
+    }
+  }
+
+  /** Returns the largest value for the given value type (exclusive). */
+  @JvmStatic
+  fun getUpperBound(value: Value): Value {
+    return when (value.valueTypeCase) {
+      ValueTypeCase.NULL_VALUE -> MIN_BOOLEAN
+      ValueTypeCase.BOOLEAN_VALUE -> MIN_NUMBER
+      ValueTypeCase.INTEGER_VALUE,
+      ValueTypeCase.DOUBLE_VALUE -> MIN_TIMESTAMP
+      ValueTypeCase.TIMESTAMP_VALUE -> MIN_STRING
+      ValueTypeCase.STRING_VALUE -> MIN_BYTES
+      ValueTypeCase.BYTES_VALUE -> MIN_REFERENCE
+      ValueTypeCase.REFERENCE_VALUE -> MIN_GEO_POINT
+      ValueTypeCase.GEO_POINT_VALUE -> MIN_ARRAY
+      ValueTypeCase.ARRAY_VALUE -> MIN_VECTOR_VALUE
+      // VectorValue sorts after ArrayValue and before an empty MapValue
+      ValueTypeCase.MAP_VALUE -> if (isVectorValue(value)) MIN_MAP else MAX_VALUE
+      else -> throw IllegalArgumentException("Unknown value type: " + value.valueTypeCase)
+    }
+  }
+
+  /** Returns true if the Value represents the canonical [.MAX_VALUE] . */
+  @JvmStatic
+  fun isMaxValue(value: Value): Boolean {
+    return MAX_VALUE_TYPE == value.mapValue.fieldsMap[TYPE_KEY]
+  }
+
+  /** Returns true if the Value represents a VectorValue . */
+  @JvmStatic
+  fun isVectorValue(value: Value): Boolean {
+    return VECTOR_VALUE_TYPE == value.mapValue.fieldsMap[TYPE_KEY]
+  }
+
+  @JvmStatic fun encodeValue(value: Long): Value = Value.newBuilder().setIntegerValue(value).build()
+
+  @JvmStatic
+  fun encodeValue(value: Int): Value = Value.newBuilder().setIntegerValue(value.toLong()).build()
+
+  @JvmStatic
+  fun encodeValue(value: Double): Value = Value.newBuilder().setDoubleValue(value).build()
+
+  @JvmStatic
+  fun encodeValue(value: Float): Value = Value.newBuilder().setDoubleValue(value.toDouble()).build()
+
+  @JvmStatic
+  fun encodeValue(value: Number): Value =
+    when (value) {
+      is Long -> encodeValue(value)
+      is Int -> encodeValue(value)
+      is Double -> encodeValue(value)
+      is Float -> encodeValue(value)
+      else -> throw IllegalArgumentException("Unexpected number type: $value")
+    }
+
+  @JvmStatic
+  fun encodeValue(value: String): Value = Value.newBuilder().setStringValue(value).build()
+
+  @JvmStatic fun encodeValue(date: Date): Value = encodeValue(com.google.firebase.Timestamp((date)))
+
+  @JvmStatic
+  fun encodeValue(timestamp: com.google.firebase.Timestamp): Value {
+    // Firestore backend truncates precision down to microseconds. To ensure offline mode works
+    // the same with regards to truncation, perform the truncation immediately without waiting for
+    // the backend to do that.
+    val truncatedNanoseconds: Int = timestamp.nanoseconds / 1000 * 1000
+
+    return Value.newBuilder()
+      .setTimestampValue(
+        Timestamp.newBuilder().setSeconds(timestamp.seconds).setNanos(truncatedNanoseconds)
+      )
+      .build()
+  }
+
+  @JvmField
+  val TRUE: Value = Value.newBuilder().setBooleanValue(true).build()
+
+  @JvmField
+  val FALSE: Value = Value.newBuilder().setBooleanValue(false).build()
+
+  @JvmStatic
+  fun encodeValue(value: Boolean): Value = if (value) TRUE else FALSE
+
+  @JvmStatic
+  fun encodeValue(geoPoint: GeoPoint): Value =
+    Value.newBuilder()
+      .setGeoPointValue(
+        LatLng.newBuilder().setLatitude(geoPoint.latitude).setLongitude(geoPoint.longitude)
+      )
+      .build()
+
+  @JvmStatic
+  fun encodeValue(value: ByteArray): Value =
+    Value.newBuilder().setBytesValue(ByteString.copyFrom(value)).build()
+
+  @JvmStatic
+  fun encodeValue(value: Blob): Value =
+    Value.newBuilder().setBytesValue(value.toByteString()).build()
+
+  @JvmStatic
+  fun encodeValue(docRef: DocumentReference): Value =
+    Value.newBuilder().setReferenceValue(docRef.fullPath).build()
+
+  @JvmStatic fun encodeValue(vector: VectorValue): Value = encodeVectorValue(vector.toArray())
+
+  @JvmStatic
+  fun encodeVectorValue(vector: DoubleArray): Value {
+    val listBuilder = ArrayValue.newBuilder()
+    for (value in vector) {
+      listBuilder.addValues(encodeValue(value))
+    }
+    return Value.newBuilder()
+      .setMapValue(
+        MapValue.newBuilder()
+          .putFields(TYPE_KEY, VECTOR_VALUE_TYPE)
+          .putFields(VECTOR_MAP_VECTORS_KEY, Value.newBuilder().setArrayValue(listBuilder).build())
+      )
+      .build()
+  }
+
+  @JvmStatic
+  fun encodeValue(map: Map<String, Value>): Value =
+    Value.newBuilder().setMapValue(MapValue.newBuilder().putAllFields(map)).build()
+
+  @JvmStatic
+  fun encodeValue(values: Iterable<Value>): Value =
+    Value.newBuilder().setArrayValue(ArrayValue.newBuilder().addAllValues(values)).build()
+
+  @JvmStatic
+  fun encodeAnyValue(value: Any?): Value =
+    when (value) {
+      null -> NULL_VALUE
+      is String -> encodeValue(value)
+      is Number -> encodeValue(value)
+      is Date -> encodeValue(value)
+      is com.google.firebase.Timestamp -> encodeValue(value)
+      is Boolean -> encodeValue(value)
+      is GeoPoint -> encodeValue(value)
+      is Blob -> encodeValue(value)
+      is VectorValue -> encodeValue(value)
+      else -> throw IllegalArgumentException("Unexpected type: $value")
+    }
+}
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/pipeline/aggregates.kt b/firebase-firestore/src/main/java/com/google/firebase/firestore/pipeline/aggregates.kt
new file mode 100644
index 00000000000..0ce88ce385b
--- /dev/null
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/pipeline/aggregates.kt
@@ -0,0 +1,160 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.firebase.firestore.pipeline
+
+import com.google.firebase.firestore.UserDataReader
+import com.google.firestore.v1.Value
+
+class AggregateWithAlias
+internal constructor(internal val alias: String, internal val expr: AggregateFunction)
+
+/** A class that represents an aggregate function. */
+class AggregateFunction
+private constructor(
+  private val name: String,
+  private val params: Array<out Expr>,
+  private val options: InternalOptions = InternalOptions.EMPTY
+) {
+  private constructor(name: String) : this(name, emptyArray())
+  private constructor(name: String, expr: Expr) : this(name, arrayOf(expr))
+  private constructor(name: String, fieldName: String) : this(name, Expr.field(fieldName))
+
+  companion object {
+
+    @JvmStatic fun generic(name: String, vararg expr: Expr) = AggregateFunction(name, expr)
+
+    /**
+     * Creates an aggregation that counts the total number of stage inputs.
+     *
+     * @return A new [AggregateFunction] representing the countAll aggregation.
+     */
+    @JvmStatic fun countAll() = AggregateFunction("count")
+
+    /**
+     * Creates an aggregation that counts the number of stage inputs where the input field exists.
+     *
+     * @param fieldName The name of the field to count.
+     * @return A new [AggregateFunction] representing the 'count' aggregation.
+     */
+    @JvmStatic fun count(fieldName: String) = AggregateFunction("count", fieldName)
+
+    /**
+     * Creates an aggregation that counts the number of stage inputs with valid evaluations of the
+     * provided [expression].
+     *
+     * @param expression The expression to count.
+     * @return A new [AggregateFunction] representing the 'count' aggregation.
+     */
+    @JvmStatic fun count(expression: Expr) = AggregateFunction("count", expression)
+
+    /**
+     * Creates an aggregation that counts the number of stage inputs where the provided boolean
+     * expression evaluates to true.
+     *
+     * @param condition The boolean expression to evaluate on each input.
+     * @return A new [AggregateFunction] representing the count aggregation.
+     */
+    @JvmStatic fun countIf(condition: BooleanExpr) = AggregateFunction("countIf", condition)
+
+    /**
+     * Creates an aggregation that calculates the sum of a field's values across multiple stage
+     * inputs.
+     *
+     * @param fieldName The name of the field containing numeric values to sum up.
+     * @return A new [AggregateFunction] representing the average aggregation.
+     */
+    @JvmStatic fun sum(fieldName: String) = AggregateFunction("sum", fieldName)
+
+    /**
+     * Creates an aggregation that calculates the sum of values from an expression across multiple
+     * stage inputs.
+     *
+     * @param expression The expression to sum up.
+     * @return A new [AggregateFunction] representing the sum aggregation.
+     */
+    @JvmStatic fun sum(expression: Expr) = AggregateFunction("sum", expression)
+
+    /**
+     * Creates an aggregation that calculates the average (mean) of a field's values across multiple
+     * stage inputs.
+     *
+     * @param fieldName The name of the field containing numeric values to average.
+     * @return A new [AggregateFunction] representing the average aggregation.
+     */
+    @JvmStatic fun avg(fieldName: String) = AggregateFunction("avg", fieldName)
+
+    /**
+     * Creates an aggregation that calculates the average (mean) of values from an expression across
+     * multiple stage inputs.
+     *
+     * @param expression The expression representing the values to average.
+     * @return A new [AggregateFunction] representing the average aggregation.
+     */
+    @JvmStatic fun avg(expression: Expr) = AggregateFunction("avg", expression)
+
+    /**
+     * Creates an aggregation that finds the minimum value of a field across multiple stage inputs.
+     *
+     * @param fieldName The name of the field to find the minimum value of.
+     * @return A new [AggregateFunction] representing the minimum aggregation.
+     */
+    @JvmStatic fun minimum(fieldName: String) = AggregateFunction("min", fieldName)
+
+    /**
+     * Creates an aggregation that finds the minimum value of an expression across multiple stage
+     * inputs.
+     *
+     * @param expression The expression to find the minimum value of.
+     * @return A new [AggregateFunction] representing the minimum aggregation.
+     */
+    @JvmStatic fun minimum(expression: Expr) = AggregateFunction("min", expression)
+
+    /**
+     * Creates an aggregation that finds the maximum value of a field across multiple stage inputs.
+     *
+     * @param fieldName The name of the field to find the maximum value of.
+     * @return A new [AggregateFunction] representing the maximum aggregation.
+     */
+    @JvmStatic fun maximum(fieldName: String) = AggregateFunction("max", fieldName)
+
+    /**
+     * Creates an aggregation that finds the maximum value of an expression across multiple stage
+     * inputs.
+     *
+     * @param expression The expression to find the maximum value of.
+     * @return A new [AggregateFunction] representing the maximum aggregation.
+     */
+    @JvmStatic fun maximum(expression: Expr) = AggregateFunction("max", expression)
+  }
+
+  /**
+   * Assigns an alias to this aggregate.
+   *
+   * @param alias The alias to assign to this aggregate.
+   * @return A new [AggregateWithAlias] that wraps this aggregate and associates it with the
+   * provided alias.
+   */
+  fun alias(alias: String) = AggregateWithAlias(alias, this)
+
+  internal fun toProto(userDataReader: UserDataReader): Value {
+    val builder = com.google.firestore.v1.Function.newBuilder()
+    builder.setName(name)
+    for (param in params) {
+      builder.addArgs(param.toProto(userDataReader))
+    }
+    options.forEach(builder::putOptions)
+    return Value.newBuilder().setFunctionValue(builder).build()
+  }
+}
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/pipeline/expressions.kt b/firebase-firestore/src/main/java/com/google/firebase/firestore/pipeline/expressions.kt
new file mode 100644
index 00000000000..5eb5e6c3698
--- /dev/null
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/pipeline/expressions.kt
@@ -0,0 +1,4207 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.firebase.firestore.pipeline
+
+import com.google.firebase.Timestamp
+import com.google.firebase.firestore.Blob
+import com.google.firebase.firestore.DocumentReference
+import com.google.firebase.firestore.FieldPath
+import com.google.firebase.firestore.GeoPoint
+import com.google.firebase.firestore.Pipeline
+import com.google.firebase.firestore.UserDataReader
+import com.google.firebase.firestore.VectorValue
+import com.google.firebase.firestore.model.DocumentKey
+import com.google.firebase.firestore.model.FieldPath as ModelFieldPath
+import com.google.firebase.firestore.model.Values
+import com.google.firebase.firestore.model.Values.encodeValue
+import com.google.firebase.firestore.pipeline.Expr.Companion.field
+import com.google.firebase.firestore.util.CustomClassMapper
+import com.google.firestore.v1.MapValue
+import com.google.firestore.v1.Value
+import java.util.Date
+import kotlin.reflect.KFunction1
+
+/**
+ * Represents an expression that can be evaluated to a value within the execution of a [Pipeline].
+ *
+ * Expressions are the building blocks for creating complex queries and transformations in Firestore
+ * pipelines. They can represent:
+ *
+ * - **Field references:** Access values from document fields.
+ * - **Literals:** Represent constant values (strings, numbers, booleans).
+ * - **Function calls:** Apply functions to one or more expressions.
+ *
+ * The [Expr] class provides a fluent API for building expressions. You can chain together method
+ * calls to create complex expressions.
+ */
+abstract class Expr internal constructor() {
+
+  private class ValueConstant(val value: Value) : Expr() {
+    override fun toProto(userDataReader: UserDataReader): Value = value
+  }
+
+  companion object {
+    internal fun toExprOrConstant(value: Any?): Expr =
+      toExpr(value, ::toExprOrConstant)
+        ?: pojoToExprOrConstant(CustomClassMapper.convertToPlainJavaTypes(value))
+
+    private fun pojoToExprOrConstant(value: Any?): Expr =
+      toExpr(value, ::pojoToExprOrConstant)
+        ?: throw IllegalArgumentException("Unknown type: $value")
+
+    private fun toExpr(value: Any?, toExpr: KFunction1<Any?, Expr>): Expr? {
+      if (value == null) return NULL
+      return when (value) {
+        is Expr -> value
+        is String -> constant(value)
+        is Number -> constant(value)
+        is Date -> constant(value)
+        is Timestamp -> constant(value)
+        is Boolean -> constant(value)
+        is GeoPoint -> constant(value)
+        is Blob -> constant(value)
+        is DocumentReference -> constant(value)
+        is ByteArray -> constant(value)
+        is VectorValue -> constant(value)
+        is Value -> ValueConstant(value)
+        is Map<*, *> ->
+          map(
+            value
+              .flatMap {
+                val key = it.key
+                if (key is String) listOf(constant(key), toExpr(it.value))
+                else throw IllegalArgumentException("Maps with non-string keys are not supported")
+              }
+              .toTypedArray()
+          )
+        is List<*> -> ListOfExprs(value.map(toExpr).toTypedArray())
+        else -> null
+      }
+    }
+
+    internal fun toArrayOfExprOrConstant(others: Iterable<Any>): Array<out Expr> =
+      others.map(::toExprOrConstant).toTypedArray()
+
+    internal fun toArrayOfExprOrConstant(others: Array<out Any>): Array<out Expr> =
+      others.map(::toExprOrConstant).toTypedArray()
+
+    private val NULL: Expr = ValueConstant(Values.NULL_VALUE)
+
+    /**
+     * Create a constant for a [String] value.
+     *
+     * @param value The [String] value.
+     * @return A new [Expr] constant instance.
+     */
+    @JvmStatic
+    fun constant(value: String): Expr {
+      return ValueConstant(encodeValue(value))
+    }
+
+    /**
+     * Create a constant for a [Number] value.
+     *
+     * @param value The [Number] value.
+     * @return A new [Expr] constant instance.
+     */
+    @JvmStatic
+    fun constant(value: Number): Expr {
+      return ValueConstant(encodeValue(value))
+    }
+
+    /**
+     * Create a constant for a [Date] value.
+     *
+     * @param value The [Date] value.
+     * @return A new [Expr] constant instance.
+     */
+    @JvmStatic
+    fun constant(value: Date): Expr {
+      return ValueConstant(encodeValue(value))
+    }
+
+    /**
+     * Create a constant for a [Timestamp] value.
+     *
+     * @param value The [Timestamp] value.
+     * @return A new [Expr] constant instance.
+     */
+    @JvmStatic
+    fun constant(value: Timestamp): Expr {
+      return ValueConstant(encodeValue(value))
+    }
+
+    /**
+     * Create a constant for a [Boolean] value.
+     *
+     * @param value The [Boolean] value.
+     * @return A new [BooleanExpr] constant instance.
+     */
+    @JvmStatic
+    fun constant(value: Boolean): BooleanExpr {
+      val encodedValue = encodeValue(value)
+      return object : BooleanExpr("N/A", emptyArray()) {
+        override fun toProto(userDataReader: UserDataReader): Value {
+          return encodedValue
+        }
+
+        override fun hashCode(): Int {
+          return encodedValue.hashCode()
+        }
+
+        override fun toString(): String {
+          return "constant($value)"
+        }
+      }
+    }
+
+    /**
+     * Create a constant for a [GeoPoint] value.
+     *
+     * @param value The [GeoPoint] value.
+     * @return A new [Expr] constant instance.
+     */
+    @JvmStatic
+    fun constant(value: GeoPoint): Expr {
+      return ValueConstant(encodeValue(value))
+    }
+
+    /**
+     * Create a constant for a bytes value.
+     *
+     * @param value The bytes value.
+     * @return A new [Expr] constant instance.
+     */
+    @JvmStatic
+    fun constant(value: ByteArray): Expr {
+      return ValueConstant(encodeValue(value))
+    }
+
+    /**
+     * Create a constant for a [Blob] value.
+     *
+     * @param value The [Blob] value.
+     * @return A new [Expr] constant instance.
+     */
+    @JvmStatic
+    fun constant(value: Blob): Expr {
+      return ValueConstant(encodeValue(value))
+    }
+
+    /**
+     * Create a constant for a [DocumentReference] value.
+     *
+     * @param ref The [DocumentReference] value.
+     * @return A new [Expr] constant instance.
+     */
+    @JvmStatic
+    fun constant(ref: DocumentReference): Expr {
+      return object : Expr() {
+        override fun toProto(userDataReader: UserDataReader): Value {
+          userDataReader.validateDocumentReference(ref, ::IllegalArgumentException)
+          return encodeValue(ref)
+        }
+      }
+    }
+
+    /**
+     * Create a constant for a [VectorValue] value.
+     *
+     * @param value The [VectorValue] value.
+     * @return A new [Expr] constant instance.
+     */
+    @JvmStatic
+    fun constant(value: VectorValue): Expr {
+      return ValueConstant(encodeValue(value))
+    }
+
+    /**
+     * Constant for a null value.
+     *
+     * @return A [Expr] constant instance.
+     */
+    @JvmStatic
+    fun nullValue(): Expr {
+      return NULL
+    }
+
+    /**
+     * Create a vector constant for a [DoubleArray] value.
+     *
+     * @param vector The [VectorValue] value.
+     * @return A [Expr] constant instance.
+     */
+    @JvmStatic
+    fun vector(vector: DoubleArray): Expr {
+      return ValueConstant(Values.encodeVectorValue(vector))
+    }
+
+    /**
+     * Create a vector constant for a [VectorValue] value.
+     *
+     * @param vector The [VectorValue] value.
+     * @return A [Expr] constant instance.
+     */
+    @JvmStatic
+    fun vector(vector: VectorValue): Expr {
+      return ValueConstant(encodeValue(vector))
+    }
+
+    /**
+     * Creates a [Field] instance representing the field at the given path.
+     *
+     * The path can be a simple field name (e.g., "name") or a dot-separated path to a nested field
+     * (e.g., "address.city").
+     *
+     * @param name The path to the field.
+     * @return A new [Field] instance representing the specified path.
+     */
+    @JvmStatic
+    fun field(name: String): Field {
+      if (name == DocumentKey.KEY_FIELD_NAME) {
+        return Field(ModelFieldPath.KEY_PATH)
+      }
+      return Field(FieldPath.fromDotSeparatedPath(name).internalPath)
+    }
+
+    /**
+     * Creates a [Field] instance representing the field at the given path.
+     *
+     * The path can be a simple field name (e.g., "name") or a dot-separated path to a nested field
+     * (e.g., "address.city").
+     *
+     * @param fieldPath The [FieldPath] to the field.
+     * @return A new [Field] instance representing the specified path.
+     */
+    @JvmStatic
+    fun field(fieldPath: FieldPath): Field {
+      return Field(fieldPath.internalPath)
+    }
+
+    @JvmStatic fun generic(name: String, vararg expr: Expr): Expr = FunctionExpr(name, expr)
+
+    /**
+     * Creates an expression that performs a logical 'AND' operation.
+     *
+     * @param condition The first [BooleanExpr].
+     * @param conditions Addition [BooleanExpr]s.
+     * @return A new [BooleanExpr] representing the logical 'AND' operation.
+     */
+    @JvmStatic
+    fun and(condition: BooleanExpr, vararg conditions: BooleanExpr) =
+      BooleanExpr("and", condition, *conditions)
+
+    /**
+     * Creates an expression that performs a logical 'OR' operation.
+     *
+     * @param condition The first [BooleanExpr].
+     * @param conditions Addition [BooleanExpr]s.
+     * @return A new [BooleanExpr] representing the logical 'OR' operation.
+     */
+    @JvmStatic
+    fun or(condition: BooleanExpr, vararg conditions: BooleanExpr) =
+      BooleanExpr("or", condition, *conditions)
+
+    /**
+     * Creates an expression that performs a logical 'XOR' operation.
+     *
+     * @param condition The first [BooleanExpr].
+     * @param conditions Addition [BooleanExpr]s.
+     * @return A new [BooleanExpr] representing the logical 'XOR' operation.
+     */
+    @JvmStatic
+    fun xor(condition: BooleanExpr, vararg conditions: BooleanExpr) =
+      BooleanExpr("xor", condition, *conditions)
+
+    /**
+     * Creates an expression that negates a boolean expression.
+     *
+     * @param condition The boolean expression to negate.
+     * @return A new [BooleanExpr] representing the not operation.
+     */
+    @JvmStatic fun not(condition: BooleanExpr): BooleanExpr = BooleanExpr("not", condition)
+
+    /**
+     * Creates an expression that applies a bitwise AND operation between two expressions.
+     *
+     * @param bits An expression that returns bits when evaluated.
+     * @param bitsOther An expression that returns bits when evaluated.
+     * @return A new [Expr] representing the bitwise AND operation.
+     */
+    @JvmStatic
+    fun bitAnd(bits: Expr, bitsOther: Expr): Expr = FunctionExpr("bit_and", bits, bitsOther)
+
+    /**
+     * Creates an expression that applies a bitwise AND operation between an expression and a
+     * constant.
+     *
+     * @param bits An expression that returns bits when evaluated.
+     * @param bitsOther A constant byte array.
+     * @return A new [Expr] representing the bitwise AND operation.
+     */
+    @JvmStatic
+    fun bitAnd(bits: Expr, bitsOther: ByteArray): Expr =
+      FunctionExpr("bit_and", bits, constant(bitsOther))
+
+    /**
+     * Creates an expression that applies a bitwise AND operation between an field and an
+     * expression.
+     *
+     * @param bitsFieldName Name of field that contains bits data.
+     * @param bitsOther An expression that returns bits when evaluated.
+     * @return A new [Expr] representing the bitwise AND operation.
+     */
+    @JvmStatic
+    fun bitAnd(bitsFieldName: String, bitsOther: Expr): Expr =
+      FunctionExpr("bit_and", bitsFieldName, bitsOther)
+
+    /**
+     * Creates an expression that applies a bitwise AND operation between an field and constant.
+     *
+     * @param bitsFieldName Name of field that contains bits data.
+     * @param bitsOther A constant byte array.
+     * @return A new [Expr] representing the bitwise AND operation.
+     */
+    @JvmStatic
+    fun bitAnd(bitsFieldName: String, bitsOther: ByteArray): Expr =
+      FunctionExpr("bit_and", bitsFieldName, constant(bitsOther))
+
+    /**
+     * Creates an expression that applies a bitwise OR operation between two expressions.
+     *
+     * @param bits An expression that returns bits when evaluated.
+     * @param bitsOther An expression that returns bits when evaluated.
+     * @return A new [Expr] representing the bitwise OR operation.
+     */
+    @JvmStatic
+    fun bitOr(bits: Expr, bitsOther: Expr): Expr = FunctionExpr("bit_or", bits, bitsOther)
+
+    /**
+     * Creates an expression that applies a bitwise OR operation between an expression and a
+     * constant.
+     *
+     * @param bits An expression that returns bits when evaluated.
+     * @param bitsOther A constant byte array.
+     * @return A new [Expr] representing the bitwise OR operation.
+     */
+    @JvmStatic
+    fun bitOr(bits: Expr, bitsOther: ByteArray): Expr =
+      FunctionExpr("bit_or", bits, constant(bitsOther))
+
+    /**
+     * Creates an expression that applies a bitwise OR operation between an field and an expression.
+     *
+     * @param bitsFieldName Name of field that contains bits data.
+     * @param bitsOther An expression that returns bits when evaluated.
+     * @return A new [Expr] representing the bitwise OR operation.
+     */
+    @JvmStatic
+    fun bitOr(bitsFieldName: String, bitsOther: Expr): Expr =
+      FunctionExpr("bit_or", bitsFieldName, bitsOther)
+
+    /**
+     * Creates an expression that applies a bitwise OR operation between an field and constant.
+     *
+     * @param bitsFieldName Name of field that contains bits data.
+     * @param bitsOther A constant byte array.
+     * @return A new [Expr] representing the bitwise OR operation.
+     */
+    @JvmStatic
+    fun bitOr(bitsFieldName: String, bitsOther: ByteArray): Expr =
+      FunctionExpr("bit_or", bitsFieldName, constant(bitsOther))
+
+    /**
+     * Creates an expression that applies a bitwise XOR operation between two expressions.
+     *
+     * @param bits An expression that returns bits when evaluated.
+     * @param bitsOther An expression that returns bits when evaluated.
+     * @return A new [Expr] representing the bitwise XOR operation.
+     */
+    @JvmStatic
+    fun bitXor(bits: Expr, bitsOther: Expr): Expr = FunctionExpr("bit_xor", bits, bitsOther)
+
+    /**
+     * Creates an expression that applies a bitwise XOR operation between an expression and a
+     * constant.
+     *
+     * @param bits An expression that returns bits when evaluated.
+     * @param bitsOther A constant byte array.
+     * @return A new [Expr] representing the bitwise XOR operation.
+     */
+    @JvmStatic
+    fun bitXor(bits: Expr, bitsOther: ByteArray): Expr =
+      FunctionExpr("bit_xor", bits, constant(bitsOther))
+
+    /**
+     * Creates an expression that applies a bitwise XOR operation between an field and an
+     * expression.
+     *
+     * @param bitsFieldName Name of field that contains bits data.
+     * @param bitsOther An expression that returns bits when evaluated.
+     * @return A new [Expr] representing the bitwise XOR operation.
+     */
+    @JvmStatic
+    fun bitXor(bitsFieldName: String, bitsOther: Expr): Expr =
+      FunctionExpr("bit_xor", bitsFieldName, bitsOther)
+
+    /**
+     * Creates an expression that applies a bitwise XOR operation between an field and constant.
+     *
+     * @param bitsFieldName Name of field that contains bits data.
+     * @param bitsOther A constant byte array.
+     * @return A new [Expr] representing the bitwise XOR operation.
+     */
+    @JvmStatic
+    fun bitXor(bitsFieldName: String, bitsOther: ByteArray): Expr =
+      FunctionExpr("bit_xor", bitsFieldName, constant(bitsOther))
+
+    /**
+     * Creates an expression that applies a bitwise NOT operation to an expression.
+     *
+     * @param bits An expression that returns bits when evaluated.
+     * @return A new [Expr] representing the bitwise NOT operation.
+     */
+    @JvmStatic fun bitNot(bits: Expr): Expr = FunctionExpr("bit_not", bits)
+
+    /**
+     * Creates an expression that applies a bitwise NOT operation to a field.
+     *
+     * @param bitsFieldName Name of field that contains bits data.
+     * @return A new [Expr] representing the bitwise NOT operation.
+     */
+    @JvmStatic fun bitNot(bitsFieldName: String): Expr = FunctionExpr("bit_not", bitsFieldName)
+
+    /**
+     * Creates an expression that applies a bitwise left shift operation between two expressions.
+     *
+     * @param bits An expression that returns bits when evaluated.
+     * @param numberExpr The number of bits to shift.
+     * @return A new [Expr] representing the bitwise left shift operation.
+     */
+    @JvmStatic
+    fun bitLeftShift(bits: Expr, numberExpr: Expr): Expr =
+      FunctionExpr("bit_left_shift", bits, numberExpr)
+
+    /**
+     * Creates an expression that applies a bitwise left shift operation between an expression and a
+     * constant.
+     *
+     * @param bits An expression that returns bits when evaluated.
+     * @param number The number of bits to shift.
+     * @return A new [Expr] representing the bitwise left shift operation.
+     */
+    @JvmStatic
+    fun bitLeftShift(bits: Expr, number: Int): Expr = FunctionExpr("bit_left_shift", bits, number)
+
+    /**
+     * Creates an expression that applies a bitwise left shift operation between a field and an
+     * expression.
+     *
+     * @param bitsFieldName Name of field that contains bits data.
+     * @param numberExpr The number of bits to shift.
+     * @return A new [Expr] representing the bitwise left shift operation.
+     */
+    @JvmStatic
+    fun bitLeftShift(bitsFieldName: String, numberExpr: Expr): Expr =
+      FunctionExpr("bit_left_shift", bitsFieldName, numberExpr)
+
+    /**
+     * Creates an expression that applies a bitwise left shift operation between a field and a
+     * constant.
+     *
+     * @param bitsFieldName Name of field that contains bits data.
+     * @param number The number of bits to shift.
+     * @return A new [Expr] representing the bitwise left shift operation.
+     */
+    @JvmStatic
+    fun bitLeftShift(bitsFieldName: String, number: Int): Expr =
+      FunctionExpr("bit_left_shift", bitsFieldName, number)
+
+    /**
+     * Creates an expression that applies a bitwise right shift operation between two expressions.
+     *
+     * @param bits An expression that returns bits when evaluated.
+     * @param numberExpr The number of bits to shift.
+     * @return A new [Expr] representing the bitwise right shift operation.
+     */
+    @JvmStatic
+    fun bitRightShift(bits: Expr, numberExpr: Expr): Expr =
+      FunctionExpr("bit_right_shift", bits, numberExpr)
+
+    /**
+     * Creates an expression that applies a bitwise right shift operation between an expression and
+     * a constant.
+     *
+     * @param bits An expression that returns bits when evaluated.
+     * @param number The number of bits to shift.
+     * @return A new [Expr] representing the bitwise right shift operation.
+     */
+    @JvmStatic
+    fun bitRightShift(bits: Expr, number: Int): Expr = FunctionExpr("bit_right_shift", bits, number)
+
+    /**
+     * Creates an expression that applies a bitwise right shift operation between a field and an
+     * expression.
+     *
+     * @param bitsFieldName Name of field that contains bits data.
+     * @param numberExpr The number of bits to shift.
+     * @return A new [Expr] representing the bitwise right shift operation.
+     */
+    @JvmStatic
+    fun bitRightShift(bitsFieldName: String, numberExpr: Expr): Expr =
+      FunctionExpr("bit_right_shift", bitsFieldName, numberExpr)
+
+    /**
+     * Creates an expression that applies a bitwise right shift operation between a field and a
+     * constant.
+     *
+     * @param bitsFieldName Name of field that contains bits data.
+     * @param number The number of bits to shift.
+     * @return A new [Expr] representing the bitwise right shift operation.
+     */
+    @JvmStatic
+    fun bitRightShift(bitsFieldName: String, number: Int): Expr =
+      FunctionExpr("bit_right_shift", bitsFieldName, number)
+
+    /**
+     * Creates an expression that rounds [numericExpr] to nearest integer.
+     *
+     * Rounds away from zero in halfway cases.
+     *
+     * @param numericExpr An expression that returns number when evaluated.
+     * @return A new [Expr] representing an integer result from the round operation.
+     */
+    @JvmStatic fun round(numericExpr: Expr): Expr = FunctionExpr("round", numericExpr)
+
+    /**
+     * Creates an expression that rounds [numericField] to nearest integer.
+     *
+     * Rounds away from zero in halfway cases.
+     *
+     * @param numericField Name of field that returns number when evaluated.
+     * @return A new [Expr] representing an integer result from the round operation.
+     */
+    @JvmStatic fun round(numericField: String): Expr = FunctionExpr("round", numericField)
+
+    /**
+     * Creates an expression that rounds off [numericExpr] to [decimalPlace] decimal places if
+     * [decimalPlace] is positive, rounds off digits to the left of the decimal point if
+     * [decimalPlace] is negative. Rounds away from zero in halfway cases.
+     *
+     * @param numericExpr An expression that returns number when evaluated.
+     * @param decimalPlace The number of decimal places to round.
+     * @return A new [Expr] representing the round operation.
+     */
+    @JvmStatic
+    fun roundToPrecision(numericExpr: Expr, decimalPlace: Int): Expr =
+      FunctionExpr("round", numericExpr, constant(decimalPlace))
+
+    /**
+     * Creates an expression that rounds off [numericField] to [decimalPlace] decimal places if
+     * [decimalPlace] is positive, rounds off digits to the left of the decimal point if
+     * [decimalPlace] is negative. Rounds away from zero in halfway cases.
+     *
+     * @param numericField Name of field that returns number when evaluated.
+     * @param decimalPlace The number of decimal places to round.
+     * @return A new [Expr] representing the round operation.
+     */
+    @JvmStatic
+    fun roundToPrecision(numericField: String, decimalPlace: Int): Expr =
+      FunctionExpr("round", numericField, constant(decimalPlace))
+
+    /**
+     * Creates an expression that rounds off [numericExpr] to [decimalPlace] decimal places if
+     * [decimalPlace] is positive, rounds off digits to the left of the decimal point if
+     * [decimalPlace] is negative. Rounds away from zero in halfway cases.
+     *
+     * @param numericExpr An expression that returns number when evaluated.
+     * @param decimalPlace The number of decimal places to round.
+     * @return A new [Expr] representing the round operation.
+     */
+    @JvmStatic
+    fun roundToPrecision(numericExpr: Expr, decimalPlace: Expr): Expr =
+      FunctionExpr("round", numericExpr, decimalPlace)
+
+    /**
+     * Creates an expression that rounds off [numericField] to [decimalPlace] decimal places if
+     * [decimalPlace] is positive, rounds off digits to the left of the decimal point if
+     * [decimalPlace] is negative. Rounds away from zero in halfway cases.
+     *
+     * @param numericField Name of field that returns number when evaluated.
+     * @param decimalPlace The number of decimal places to round.
+     * @return A new [Expr] representing the round operation.
+     */
+    @JvmStatic
+    fun roundToPrecision(numericField: String, decimalPlace: Expr): Expr =
+      FunctionExpr("round", numericField, decimalPlace)
+
+    /**
+     * Creates an expression that returns the smalled integer that isn't less than [numericExpr].
+     *
+     * @param numericExpr An expression that returns number when evaluated.
+     * @return A new [Expr] representing an integer result from the ceil operation.
+     */
+    @JvmStatic fun ceil(numericExpr: Expr): Expr = FunctionExpr("ceil", numericExpr)
+
+    /**
+     * Creates an expression that returns the smalled integer that isn't less than [numericField].
+     *
+     * @param numericField Name of field that returns number when evaluated.
+     * @return A new [Expr] representing an integer result from the ceil operation.
+     */
+    @JvmStatic fun ceil(numericField: String): Expr = FunctionExpr("ceil", numericField)
+
+    /**
+     * Creates an expression that returns the largest integer that isn't less than [numericExpr].
+     *
+     * @param numericExpr An expression that returns number when evaluated.
+     * @return A new [Expr] representing an integer result from the floor operation.
+     */
+    @JvmStatic fun floor(numericExpr: Expr): Expr = FunctionExpr("floor", numericExpr)
+
+    /**
+     * Creates an expression that returns the largest integer that isn't less than [numericField].
+     *
+     * @param numericField Name of field that returns number when evaluated.
+     * @return A new [Expr] representing an integer result from the floor operation.
+     */
+    @JvmStatic fun floor(numericField: String): Expr = FunctionExpr("floor", numericField)
+
+    /**
+     * Creates an expression that returns the [numericExpr] raised to the power of the [exponent].
+     * Returns infinity on overflow and zero on underflow.
+     *
+     * @param numericExpr An expression that returns number when evaluated.
+     * @param exponent The numeric power to raise the [numericExpr].
+     * @return A new [Expr] representing a numeric result from raising [numericExpr] to the power of
+     * [exponent].
+     */
+    @JvmStatic
+    fun pow(numericExpr: Expr, exponent: Number): Expr =
+      FunctionExpr("pow", numericExpr, constant(exponent))
+
+    /**
+     * Creates an expression that returns the [numericField] raised to the power of the [exponent].
+     * Returns infinity on overflow and zero on underflow.
+     *
+     * @param numericField Name of field that returns number when evaluated.
+     * @param exponent The numeric power to raise the [numericField].
+     * @return A new [Expr] representing a numeric result from raising [numericField] to the power
+     * of [exponent].
+     */
+    @JvmStatic
+    fun pow(numericField: String, exponent: Number): Expr =
+      FunctionExpr("pow", numericField, constant(exponent))
+
+    /**
+     * Creates an expression that returns the [numericExpr] raised to the power of the [exponent].
+     * Returns infinity on overflow and zero on underflow.
+     *
+     * @param numericExpr An expression that returns number when evaluated.
+     * @param exponent The numeric power to raise the [numericExpr].
+     * @return A new [Expr] representing a numeric result from raising [numericExpr] to the power of
+     * [exponent].
+     */
+    @JvmStatic
+    fun pow(numericExpr: Expr, exponent: Expr): Expr = FunctionExpr("pow", numericExpr, exponent)
+
+    /**
+     * Creates an expression that returns the [numericField] raised to the power of the [exponent].
+     * Returns infinity on overflow and zero on underflow.
+     *
+     * @param numericField Name of field that returns number when evaluated.
+     * @param exponent The numeric power to raise the [numericField].
+     * @return A new [Expr] representing a numeric result from raising [numericField] to the power
+     * of [exponent].
+     */
+    @JvmStatic
+    fun pow(numericField: String, exponent: Expr): Expr =
+      FunctionExpr("pow", numericField, exponent)
+
+    /**
+     * Creates an expression that returns the square root of [numericExpr].
+     *
+     * @param numericExpr An expression that returns number when evaluated.
+     * @return A new [Expr] representing the numeric result of the square root operation.
+     */
+    @JvmStatic fun sqrt(numericExpr: Expr): Expr = FunctionExpr("sqrt", numericExpr)
+
+    /**
+     * Creates an expression that returns the square root of [numericField].
+     *
+     * @param numericField Name of field that returns number when evaluated.
+     * @return A new [Expr] representing the numeric result of the square root operation.
+     */
+    @JvmStatic fun sqrt(numericField: String): Expr = FunctionExpr("sqrt", numericField)
+
+    /**
+     * Creates an expression that adds numeric expressions.
+     *
+     * @param first Numeric expression to add.
+     * @param second Numeric expression to add.
+     * @return A new [Expr] representing the addition operation.
+     */
+    @JvmStatic
+    fun add(first: Expr, second: Expr): Expr =
+      FunctionExpr("add", first, second)
+
+    /**
+     * Creates an expression that adds numeric expressions with a constant.
+     *
+     * @param first Numeric expression to add.
+     * @param second Constant to add.
+     * @return A new [Expr] representing the addition operation.
+     */
+    @JvmStatic
+    fun add(first: Expr, second: Number): Expr =
+      FunctionExpr("add", first, second)
+
+    /**
+     * Creates an expression that adds a numeric field with a numeric expression.
+     *
+     * @param numericFieldName Numeric field to add.
+     * @param second Numeric expression to add to field value.
+     * @return A new [Expr] representing the addition operation.
+     */
+    @JvmStatic
+    fun add(numericFieldName: String, second: Expr): Expr =
+      FunctionExpr("add", numericFieldName, second)
+
+    /**
+     * Creates an expression that adds a numeric field with constant.
+     *
+     * @param numericFieldName Numeric field to add.
+     * @param second Constant to add.
+     * @return A new [Expr] representing the addition operation.
+     */
+    @JvmStatic
+    fun add(numericFieldName: String, second: Number): Expr =
+      FunctionExpr("add", numericFieldName, second)
+
+    /**
+     * Creates an expression that subtracts two expressions.
+     *
+     * @param minuend Numeric expression to subtract from.
+     * @param subtrahend Numeric expression to subtract.
+     * @return A new [Expr] representing the subtract operation.
+     */
+    @JvmStatic
+    fun subtract(minuend: Expr, subtrahend: Expr): Expr =
+      FunctionExpr("subtract", minuend, subtrahend)
+
+    /**
+     * Creates an expression that subtracts a constant value from a numeric expression.
+     *
+     * @param minuend Numeric expression to subtract from.
+     * @param subtrahend Constant to subtract.
+     * @return A new [Expr] representing the subtract operation.
+     */
+    @JvmStatic
+    fun subtract(minuend: Expr, subtrahend: Number): Expr =
+      FunctionExpr("subtract", minuend, subtrahend)
+
+    /**
+     * Creates an expression that subtracts a numeric expressions from numeric field.
+     *
+     * @param numericFieldName Numeric field to subtract from.
+     * @param subtrahend Numeric expression to subtract.
+     * @return A new [Expr] representing the subtract operation.
+     */
+    @JvmStatic
+    fun subtract(numericFieldName: String, subtrahend: Expr): Expr =
+      FunctionExpr("subtract", numericFieldName, subtrahend)
+
+    /**
+     * Creates an expression that subtracts a constant from numeric field.
+     *
+     * @param numericFieldName Numeric field to subtract from.
+     * @param subtrahend Constant to subtract.
+     * @return A new [Expr] representing the subtract operation.
+     */
+    @JvmStatic
+    fun subtract(numericFieldName: String, subtrahend: Number): Expr =
+      FunctionExpr("subtract", numericFieldName, subtrahend)
+
+    /**
+     * Creates an expression that multiplies numeric expressions.
+     *
+     * @param first Numeric expression to multiply.
+     * @param second Numeric expression to multiply.
+     * @return A new [Expr] representing the multiplication operation.
+     */
+    @JvmStatic
+    fun multiply(first: Expr, second: Expr): Expr =
+      FunctionExpr("multiply", first, second)
+
+    /**
+     * Creates an expression that multiplies numeric expressions with a constant.
+     *
+     * @param first Numeric expression to multiply.
+     * @param second Constant to multiply.
+     * @return A new [Expr] representing the multiplication operation.
+     */
+    @JvmStatic
+    fun multiply(first: Expr, second: Number): Expr =
+      FunctionExpr("multiply", first, second)
+
+    /**
+     * Creates an expression that multiplies a numeric field with a numeric expression.
+     *
+     * @param numericFieldName Numeric field to multiply.
+     * @param second Numeric expression to multiply.
+     * @return A new [Expr] representing the multiplication operation.
+     */
+    @JvmStatic
+    fun multiply(numericFieldName: String, second: Expr): Expr =
+      FunctionExpr("multiply", numericFieldName, second)
+
+    /**
+     * Creates an expression that multiplies a numeric field with a constant.
+     *
+     * @param numericFieldName Numeric field to multiply.
+     * @param second Constant to multiply.
+     * @return A new [Expr] representing the multiplication operation.
+     */
+    @JvmStatic
+    fun multiply(numericFieldName: String, second: Number): Expr =
+      FunctionExpr("multiply", numericFieldName, second)
+
+    /**
+     * Creates an expression that divides two numeric expressions.
+     *
+     * @param dividend The numeric expression to be divided.
+     * @param divisor The numeric expression to divide by.
+     * @return A new [Expr] representing the division operation.
+     */
+    @JvmStatic
+    fun divide(dividend: Expr, divisor: Expr): Expr = FunctionExpr("divide", dividend, divisor)
+
+    /**
+     * Creates an expression that divides a numeric expression by a constant.
+     *
+     * @param dividend The numeric expression to be divided.
+     * @param divisor The constant to divide by.
+     * @return A new [Expr] representing the division operation.
+     */
+    @JvmStatic
+    fun divide(dividend: Expr, divisor: Number): Expr = FunctionExpr("divide", dividend, divisor)
+
+    /**
+     * Creates an expression that divides numeric field by a numeric expression.
+     *
+     * @param dividendFieldName The numeric field name to be divided.
+     * @param divisor The numeric expression to divide by.
+     * @return A new [Expr] representing the divide operation.
+     */
+    @JvmStatic
+    fun divide(dividendFieldName: String, divisor: Expr): Expr =
+      FunctionExpr("divide", dividendFieldName, divisor)
+
+    /**
+     * Creates an expression that divides a numeric field by a constant.
+     *
+     * @param dividendFieldName The numeric field name to be divided.
+     * @param divisor The constant to divide by.
+     * @return A new [Expr] representing the divide operation.
+     */
+    @JvmStatic
+    fun divide(dividendFieldName: String, divisor: Number): Expr =
+      FunctionExpr("divide", dividendFieldName, divisor)
+
+    /**
+     * Creates an expression that calculates the modulo (remainder) of dividing two numeric
+     * expressions.
+     *
+     * @param dividend The numeric expression to be divided.
+     * @param divisor The numeric expression to divide by.
+     * @return A new [Expr] representing the modulo operation.
+     */
+    @JvmStatic fun mod(dividend: Expr, divisor: Expr): Expr = FunctionExpr("mod", dividend, divisor)
+
+    /**
+     * Creates an expression that calculates the modulo (remainder) of dividing a numeric expression
+     * by a constant.
+     *
+     * @param dividend The numeric expression to be divided.
+     * @param divisor The constant to divide by.
+     * @return A new [Expr] representing the modulo operation.
+     */
+    @JvmStatic
+    fun mod(dividend: Expr, divisor: Number): Expr = FunctionExpr("mod", dividend, divisor)
+
+    /**
+     * Creates an expression that calculates the modulo (remainder) of dividing a numeric field by a
+     * constant.
+     *
+     * @param dividendFieldName The numeric field name to be divided.
+     * @param divisor The numeric expression to divide by.
+     * @return A new [Expr] representing the modulo operation.
+     */
+    @JvmStatic
+    fun mod(dividendFieldName: String, divisor: Expr): Expr =
+      FunctionExpr("mod", dividendFieldName, divisor)
+
+    /**
+     * Creates an expression that calculates the modulo (remainder) of dividing a numeric field by a
+     * constant.
+     *
+     * @param dividendFieldName The numeric field name to be divided.
+     * @param divisor The constant to divide by.
+     * @return A new [Expr] representing the modulo operation.
+     */
+    @JvmStatic
+    fun mod(dividendFieldName: String, divisor: Number): Expr =
+      FunctionExpr("mod", dividendFieldName, divisor)
+
+    /**
+     * Creates an expression that checks if an [expression], when evaluated, is equal to any of the
+     * provided [values].
+     *
+     * @param expression The expression whose results to compare.
+     * @param values The values to check against.
+     * @return A new [BooleanExpr] representing the 'IN' comparison.
+     */
+    @JvmStatic
+    fun eqAny(expression: Expr, values: List<Any>): BooleanExpr =
+      eqAny(expression, ListOfExprs(toArrayOfExprOrConstant(values)))
+
+    /**
+     * Creates an expression that checks if an [expression], when evaluated, is equal to any of the
+     * elements of [arrayExpression].
+     *
+     * @param expression The expression whose results to compare.
+     * @param arrayExpression An expression that evaluates to an array, whose elements to check for
+     * equality to the input.
+     * @return A new [BooleanExpr] representing the 'IN' comparison.
+     */
+    @JvmStatic
+    fun eqAny(expression: Expr, arrayExpression: Expr): BooleanExpr =
+      BooleanExpr("eq_any", expression, arrayExpression)
+
+    /**
+     * Creates an expression that checks if a field's value is equal to any of the provided [values]
+     * .
+     *
+     * @param fieldName The field to compare.
+     * @param values The values to check against.
+     * @return A new [BooleanExpr] representing the 'IN' comparison.
+     */
+    @JvmStatic
+    fun eqAny(fieldName: String, values: List<Any>): BooleanExpr =
+      eqAny(fieldName, ListOfExprs(toArrayOfExprOrConstant(values)))
+
+    /**
+     * Creates an expression that checks if a field's value is equal to any of the elements of
+     * [arrayExpression].
+     *
+     * @param fieldName The field to compare.
+     * @param arrayExpression An expression that evaluates to an array, whose elements to check for
+     * equality to the input.
+     * @return A new [BooleanExpr] representing the 'IN' comparison.
+     */
+    @JvmStatic
+    fun eqAny(fieldName: String, arrayExpression: Expr): BooleanExpr =
+      BooleanExpr("eq_any", fieldName, arrayExpression)
+
+    /**
+     * Creates an expression that checks if an [expression], when evaluated, is not equal to all the
+     * provided [values].
+     *
+     * @param expression The expression whose results to compare.
+     * @param values The values to check against.
+     * @return A new [BooleanExpr] representing the 'NOT IN' comparison.
+     */
+    @JvmStatic
+    fun notEqAny(expression: Expr, values: List<Any>): BooleanExpr =
+      notEqAny(expression, ListOfExprs(toArrayOfExprOrConstant(values)))
+
+    /**
+     * Creates an expression that checks if an [expression], when evaluated, is not equal to all the
+     * elements of [arrayExpression].
+     *
+     * @param expression The expression whose results to compare.
+     * @param arrayExpression An expression that evaluates to an array, whose elements to check for
+     * equality to the input.
+     * @return A new [BooleanExpr] representing the 'NOT IN' comparison.
+     */
+    @JvmStatic
+    fun notEqAny(expression: Expr, arrayExpression: Expr): BooleanExpr =
+      BooleanExpr("not_eq_any", expression, arrayExpression)
+
+    /**
+     * Creates an expression that checks if a field's value is not equal to all of the provided
+     * [values].
+     *
+     * @param fieldName The field to compare.
+     * @param values The values to check against.
+     * @return A new [BooleanExpr] representing the 'NOT IN' comparison.
+     */
+    @JvmStatic
+    fun notEqAny(fieldName: String, values: List<Any>): BooleanExpr =
+      notEqAny(fieldName, ListOfExprs(toArrayOfExprOrConstant(values)))
+
+    /**
+     * Creates an expression that checks if a field's value is not equal to all of the elements of
+     * [arrayExpression].
+     *
+     * @param fieldName The field to compare.
+     * @param arrayExpression An expression that evaluates to an array, whose elements to check for
+     * equality to the input.
+     * @return A new [BooleanExpr] representing the 'NOT IN' comparison.
+     */
+    @JvmStatic
+    fun notEqAny(fieldName: String, arrayExpression: Expr): BooleanExpr =
+      BooleanExpr("not_eq_any", fieldName, arrayExpression)
+
+    /**
+     * Creates an expression that returns true if a value is absent. Otherwise, returns false even
+     * if the value is null.
+     *
+     * @param value The expression to check.
+     * @return A new [BooleanExpr] representing the isAbsent operation.
+     */
+    @JvmStatic fun isAbsent(value: Expr): BooleanExpr = BooleanExpr("is_absent", value)
+
+    /**
+     * Creates an expression that returns true if a field is absent. Otherwise, returns false even
+     * if the field value is null.
+     *
+     * @param fieldName The field to check.
+     * @return A new [BooleanExpr] representing the isAbsent operation.
+     */
+    @JvmStatic fun isAbsent(fieldName: String): BooleanExpr = BooleanExpr("is_absent", fieldName)
+
+    /**
+     * Creates an expression that checks if an expression evaluates to 'NaN' (Not a Number).
+     *
+     * @param expr The expression to check.
+     * @return A new [BooleanExpr] representing the isNan operation.
+     */
+    @JvmStatic fun isNan(expr: Expr): BooleanExpr = BooleanExpr("is_nan", expr)
+
+    /**
+     * Creates an expression that checks if [expr] evaluates to 'NaN' (Not a Number).
+     *
+     * @param fieldName The field to check.
+     * @return A new [BooleanExpr] representing the isNan operation.
+     */
+    @JvmStatic fun isNan(fieldName: String): BooleanExpr = BooleanExpr("is_nan", fieldName)
+
+    /**
+     * Creates an expression that checks if the results of [expr] is NOT 'NaN' (Not a Number).
+     *
+     * @param expr The expression to check.
+     * @return A new [BooleanExpr] representing the isNotNan operation.
+     */
+    @JvmStatic fun isNotNan(expr: Expr): BooleanExpr = BooleanExpr("is_not_nan", expr)
+
+    /**
+     * Creates an expression that checks if the results of this expression is NOT 'NaN' (Not a
+     * Number).
+     *
+     * @param fieldName The field to check.
+     * @return A new [BooleanExpr] representing the isNotNan operation.
+     */
+    @JvmStatic fun isNotNan(fieldName: String): BooleanExpr = BooleanExpr("is_not_nan", fieldName)
+
+    /**
+     * Creates an expression that checks if tbe result of [expr] is null.
+     *
+     * @param expr The expression to check.
+     * @return A new [BooleanExpr] representing the isNull operation.
+     */
+    @JvmStatic fun isNull(expr: Expr): BooleanExpr = BooleanExpr("is_null", expr)
+
+    /**
+     * Creates an expression that checks if tbe value of a field is null.
+     *
+     * @param fieldName The field to check.
+     * @return A new [BooleanExpr] representing the isNull operation.
+     */
+    @JvmStatic fun isNull(fieldName: String): BooleanExpr = BooleanExpr("is_null", fieldName)
+
+    /**
+     * Creates an expression that checks if tbe result of [expr] is not null.
+     *
+     * @param expr The expression to check.
+     * @return A new [BooleanExpr] representing the isNotNull operation.
+     */
+    @JvmStatic fun isNotNull(expr: Expr): BooleanExpr = BooleanExpr("is_not_null", expr)
+
+    /**
+     * Creates an expression that checks if tbe value of a field is not null.
+     *
+     * @param fieldName The field to check.
+     * @return A new [BooleanExpr] representing the isNotNull operation.
+     */
+    @JvmStatic fun isNotNull(fieldName: String): BooleanExpr = BooleanExpr("is_not_null", fieldName)
+
+    /**
+     * Creates an expression that replaces the first occurrence of a substring within the
+     * [stringExpression].
+     *
+     * @param stringExpression The expression representing the string to perform the replacement on.
+     * @param find The expression representing the substring to search for in [stringExpression].
+     * @param replace The expression representing the replacement for the first occurrence of [find]
+     * .
+     * @return A new [Expr] representing the string with the first occurrence replaced.
+     */
+    @JvmStatic
+    fun replaceFirst(stringExpression: Expr, find: Expr, replace: Expr): Expr =
+      FunctionExpr("replace_first", stringExpression, find, replace)
+
+    /**
+     * Creates an expression that replaces the first occurrence of a substring within the
+     * [stringExpression].
+     *
+     * @param stringExpression The expression representing the string to perform the replacement on.
+     * @param find The substring to search for in [stringExpression].
+     * @param replace The replacement for the first occurrence of [find] with.
+     * @return A new [Expr] representing the string with the first occurrence replaced.
+     */
+    @JvmStatic
+    fun replaceFirst(stringExpression: Expr, find: String, replace: String): Expr =
+      FunctionExpr("replace_first", stringExpression, find, replace)
+
+    /**
+     * Creates an expression that replaces the first occurrence of a substring within the specified
+     * string field.
+     *
+     * @param fieldName The name of the field representing the string to perform the replacement on.
+     * @param find The expression representing the substring to search for in specified string
+     * field.
+     * @param replace The expression representing the replacement for the first occurrence of [find]
+     * with.
+     * @return A new [Expr] representing the string with the first occurrence replaced.
+     */
+    @JvmStatic
+    fun replaceFirst(fieldName: String, find: Expr, replace: Expr): Expr =
+      FunctionExpr("replace_first", fieldName, find, replace)
+
+    /**
+     * Creates an expression that replaces the first occurrence of a substring within the specified
+     * string field.
+     *
+     * @param fieldName The name of the field representing the string to perform the replacement on.
+     * @param find The substring to search for in specified string field.
+     * @param replace The replacement for the first occurrence of [find] with.
+     * @return A new [Expr] representing the string with the first occurrence replaced.
+     */
+    @JvmStatic
+    fun replaceFirst(fieldName: String, find: String, replace: String): Expr =
+      FunctionExpr("replace_first", fieldName, find, replace)
+
+    /**
+     * Creates an expression that replaces all occurrences of a substring within the
+     * [stringExpression].
+     *
+     * @param stringExpression The expression representing the string to perform the replacement on.
+     * @param find The expression representing the substring to search for in [stringExpression].
+     * @param replace The expression representing the replacement for all occurrences of [find].
+     * @return A new [Expr] representing the string with all occurrences replaced.
+     */
+    @JvmStatic
+    fun replaceAll(stringExpression: Expr, find: Expr, replace: Expr): Expr =
+      FunctionExpr("replace_all", stringExpression, find, replace)
+
+    /**
+     * Creates an expression that replaces all occurrences of a substring within the
+     * [stringExpression].
+     *
+     * @param stringExpression The expression representing the string to perform the replacement on.
+     * @param find The substring to search for in [stringExpression].
+     * @param replace The replacement for all occurrences of [find] with.
+     * @return A new [Expr] representing the string with all occurrences replaced.
+     */
+    @JvmStatic
+    fun replaceAll(stringExpression: Expr, find: String, replace: String): Expr =
+      FunctionExpr("replace_all", stringExpression, find, replace)
+
+    /**
+     * Creates an expression that replaces all occurrences of a substring within the specified
+     * string field.
+     *
+     * @param fieldName The name of the field representing the string to perform the replacement on.
+     * @param find The expression representing the substring to search for in specified string
+     * field.
+     * @param replace The expression representing the replacement for all occurrences of [find]
+     * with.
+     * @return A new [Expr] representing the string with all occurrences replaced.
+     */
+    @JvmStatic
+    fun replaceAll(fieldName: String, find: Expr, replace: Expr): Expr =
+      FunctionExpr("replace_all", fieldName, find, replace)
+
+    /**
+     * Creates an expression that replaces all occurrences of a substring within the specified
+     * string field.
+     *
+     * @param fieldName The name of the field representing the string to perform the replacement on.
+     * @param find The substring to search for in specified string field.
+     * @param replace The replacement for all occurrences of [find] with.
+     * @return A new [Expr] representing the string with all occurrences replaced.
+     */
+    @JvmStatic
+    fun replaceAll(fieldName: String, find: String, replace: String): Expr =
+      FunctionExpr("replace_all", fieldName, find, replace)
+
+    /**
+     * Creates an expression that calculates the character length of a string expression in UTF8.
+     *
+     * @param expr The expression representing the string.
+     * @return A new [Expr] representing the charLength operation.
+     */
+    @JvmStatic fun charLength(expr: Expr): Expr = FunctionExpr("char_length", expr)
+
+    /**
+     * Creates an expression that calculates the character length of a string field in UTF8.
+     *
+     * @param fieldName The name of the field containing the string.
+     * @return A new [Expr] representing the charLength operation.
+     */
+    @JvmStatic fun charLength(fieldName: String): Expr = FunctionExpr("char_length", fieldName)
+
+    /**
+     * Creates an expression that calculates the length of a string in UTF-8 bytes, or just the
+     * length of a Blob.
+     *
+     * @param value The expression representing the string.
+     * @return A new [Expr] representing the length of the string in bytes.
+     */
+    @JvmStatic fun byteLength(value: Expr): Expr = FunctionExpr("byte_length", value)
+
+    /**
+     * Creates an expression that calculates the length of a string represented by a field in UTF-8
+     * bytes, or just the length of a Blob.
+     *
+     * @param fieldName The name of the field containing the string.
+     * @return A new [Expr] representing the length of the string in bytes.
+     */
+    @JvmStatic fun byteLength(fieldName: String): Expr = FunctionExpr("byte_length", fieldName)
+
+    /**
+     * Creates an expression that performs a case-sensitive wildcard string comparison.
+     *
+     * @param stringExpression The expression representing the string to perform the comparison on.
+     * @param pattern The pattern to search for. You can use "%" as a wildcard character.
+     * @return A new [BooleanExpr] representing the like operation.
+     */
+    @JvmStatic
+    fun like(stringExpression: Expr, pattern: Expr): BooleanExpr =
+      BooleanExpr("like", stringExpression, pattern)
+
+    /**
+     * Creates an expression that performs a case-sensitive wildcard string comparison.
+     *
+     * @param stringExpression The expression representing the string to perform the comparison on.
+     * @param pattern The pattern to search for. You can use "%" as a wildcard character.
+     * @return A new [BooleanExpr] representing the like operation.
+     */
+    @JvmStatic
+    fun like(stringExpression: Expr, pattern: String): BooleanExpr =
+      BooleanExpr("like", stringExpression, pattern)
+
+    /**
+     * Creates an expression that performs a case-sensitive wildcard string comparison against a
+     * field.
+     *
+     * @param fieldName The name of the field containing the string.
+     * @param pattern The pattern to search for. You can use "%" as a wildcard character.
+     * @return A new [BooleanExpr] representing the like comparison.
+     */
+    @JvmStatic
+    fun like(fieldName: String, pattern: Expr): BooleanExpr =
+      BooleanExpr("like", fieldName, pattern)
+
+    /**
+     * Creates an expression that performs a case-sensitive wildcard string comparison against a
+     * field.
+     *
+     * @param fieldName The name of the field containing the string.
+     * @param pattern The pattern to search for. You can use "%" as a wildcard character.
+     * @return A new [BooleanExpr] representing the like comparison.
+     */
+    @JvmStatic
+    fun like(fieldName: String, pattern: String): BooleanExpr =
+      BooleanExpr("like", fieldName, pattern)
+
+    /**
+     * Creates an expression that return a pseudo-random number of type double in the range of [0,
+     * 1), inclusive of 0 and exclusive of 1.
+     *
+     * @return A new [Expr] representing the random number operation.
+     */
+    @JvmStatic fun rand(): Expr = FunctionExpr("rand")
+
+    /**
+     * Creates an expression that checks if a string expression contains a specified regular
+     * expression as a substring.
+     *
+     * @param stringExpression The expression representing the string to perform the comparison on.
+     * @param pattern The regular expression to use for the search.
+     * @return A new [BooleanExpr] representing the contains regular expression comparison.
+     */
+    @JvmStatic
+    fun regexContains(stringExpression: Expr, pattern: Expr): BooleanExpr =
+      BooleanExpr("regex_contains", stringExpression, pattern)
+
+    /**
+     * Creates an expression that checks if a string expression contains a specified regular
+     * expression as a substring.
+     *
+     * @param stringExpression The expression representing the string to perform the comparison on.
+     * @param pattern The regular expression to use for the search.
+     * @return A new [BooleanExpr] representing the contains regular expression comparison.
+     */
+    @JvmStatic
+    fun regexContains(stringExpression: Expr, pattern: String): BooleanExpr =
+      BooleanExpr("regex_contains", stringExpression, pattern)
+
+    /**
+     * Creates an expression that checks if a string field contains a specified regular expression
+     * as a substring.
+     *
+     * @param fieldName The name of the field containing the string.
+     * @param pattern The regular expression to use for the search.
+     * @return A new [BooleanExpr] representing the contains regular expression comparison.
+     */
+    @JvmStatic
+    fun regexContains(fieldName: String, pattern: Expr) =
+      BooleanExpr("regex_contains", fieldName, pattern)
+
+    /**
+     * Creates an expression that checks if a string field contains a specified regular expression
+     * as a substring.
+     *
+     * @param fieldName The name of the field containing the string.
+     * @param pattern The regular expression to use for the search.
+     * @return A new [BooleanExpr] representing the contains regular expression comparison.
+     */
+    @JvmStatic
+    fun regexContains(fieldName: String, pattern: String) =
+      BooleanExpr("regex_contains", fieldName, pattern)
+
+    /**
+     * Creates an expression that checks if a string field matches a specified regular expression.
+     *
+     * @param stringExpression The expression representing the string to match against.
+     * @param pattern The regular expression to use for the match.
+     * @return A new [BooleanExpr] representing the regular expression match comparison.
+     */
+    @JvmStatic
+    fun regexMatch(stringExpression: Expr, pattern: Expr): BooleanExpr =
+      BooleanExpr("regex_match", stringExpression, pattern)
+
+    /**
+     * Creates an expression that checks if a string field matches a specified regular expression.
+     *
+     * @param stringExpression The expression representing the string to match against.
+     * @param pattern The regular expression to use for the match.
+     * @return A new [BooleanExpr] representing the regular expression match comparison.
+     */
+    @JvmStatic
+    fun regexMatch(stringExpression: Expr, pattern: String): BooleanExpr =
+      BooleanExpr("regex_match", stringExpression, pattern)
+
+    /**
+     * Creates an expression that checks if a string field matches a specified regular expression.
+     *
+     * @param fieldName The name of the field containing the string.
+     * @param pattern The regular expression to use for the match.
+     * @return A new [BooleanExpr] representing the regular expression match comparison.
+     */
+    @JvmStatic
+    fun regexMatch(fieldName: String, pattern: Expr) =
+      BooleanExpr("regex_match", fieldName, pattern)
+
+    /**
+     * Creates an expression that checks if a string field matches a specified regular expression.
+     *
+     * @param fieldName The name of the field containing the string.
+     * @param pattern The regular expression to use for the match.
+     * @return A new [BooleanExpr] representing the regular expression match comparison.
+     */
+    @JvmStatic
+    fun regexMatch(fieldName: String, pattern: String) =
+      BooleanExpr("regex_match", fieldName, pattern)
+
+    /**
+     * Creates an expression that returns the largest value between multiple input expressions or
+     * literal values. Based on Firestore's value type ordering.
+     *
+     * @param expr The first operand expression.
+     * @param others Optional additional expressions or literals.
+     * @return A new [Expr] representing the logical maximum operation.
+     */
+    @JvmStatic
+    fun logicalMaximum(expr: Expr, vararg others: Any): Expr =
+      FunctionExpr("logical_max", expr, *others)
+
+    /**
+     * Creates an expression that returns the largest value between multiple input expressions or
+     * literal values. Based on Firestore's value type ordering.
+     *
+     * @param fieldName The first operand field name.
+     * @param others Optional additional expressions or literals.
+     * @return A new [Expr] representing the logical maximum operation.
+     */
+    @JvmStatic
+    fun logicalMaximum(fieldName: String, vararg others: Any): Expr =
+      FunctionExpr("logical_max", fieldName, *others)
+
+    /**
+     * Creates an expression that returns the smallest value between multiple input expressions or
+     * literal values. Based on Firestore's value type ordering.
+     *
+     * @param expr The first operand expression.
+     * @param others Optional additional expressions or literals.
+     * @return A new [Expr] representing the logical minimum operation.
+     */
+    @JvmStatic
+    fun logicalMinimum(expr: Expr, vararg others: Any): Expr =
+      FunctionExpr("logical_min", expr, *others)
+
+    /**
+     * Creates an expression that returns the smallest value between multiple input expressions or
+     * literal values. Based on Firestore's value type ordering.
+     *
+     * @param fieldName The first operand field name.
+     * @param others Optional additional expressions or literals.
+     * @return A new [Expr] representing the logical minimum operation.
+     */
+    @JvmStatic
+    fun logicalMinimum(fieldName: String, vararg others: Any): Expr =
+      FunctionExpr("logical_min", fieldName, *others)
+
+    /**
+     * Creates an expression that reverses a string.
+     *
+     * @param stringExpression An expression evaluating to a string value, which will be reversed.
+     * @return A new [Expr] representing the reversed string.
+     */
+    @JvmStatic fun reverse(stringExpression: Expr): Expr = FunctionExpr("reverse", stringExpression)
+
+    /**
+     * Creates an expression that reverses a string value from the specified field.
+     *
+     * @param fieldName The name of the field that contains the string to reverse.
+     * @return A new [Expr] representing the reversed string.
+     */
+    @JvmStatic fun reverse(fieldName: String): Expr = FunctionExpr("reverse", fieldName)
+
+    /**
+     * Creates an expression that checks if a string expression contains a specified substring.
+     *
+     * @param stringExpression The expression representing the string to perform the comparison on.
+     * @param substring The expression representing the substring to search for.
+     * @return A new [BooleanExpr] representing the contains comparison.
+     */
+    @JvmStatic
+    fun strContains(stringExpression: Expr, substring: Expr): BooleanExpr =
+      BooleanExpr("str_contains", stringExpression, substring)
+
+    /**
+     * Creates an expression that checks if a string expression contains a specified substring.
+     *
+     * @param stringExpression The expression representing the string to perform the comparison on.
+     * @param substring The substring to search for.
+     * @return A new [BooleanExpr] representing the contains comparison.
+     */
+    @JvmStatic
+    fun strContains(stringExpression: Expr, substring: String): BooleanExpr =
+      BooleanExpr("str_contains", stringExpression, substring)
+
+    /**
+     * Creates an expression that checks if a string field contains a specified substring.
+     *
+     * @param fieldName The name of the field to perform the comparison on.
+     * @param substring The expression representing the substring to search for.
+     * @return A new [BooleanExpr] representing the contains comparison.
+     */
+    @JvmStatic
+    fun strContains(fieldName: String, substring: Expr): BooleanExpr =
+      BooleanExpr("str_contains", fieldName, substring)
+
+    /**
+     * Creates an expression that checks if a string field contains a specified substring.
+     *
+     * @param fieldName The name of the field to perform the comparison on.
+     * @param substring The substring to search for.
+     * @return A new [BooleanExpr] representing the contains comparison.
+     */
+    @JvmStatic
+    fun strContains(fieldName: String, substring: String): BooleanExpr =
+      BooleanExpr("str_contains", fieldName, substring)
+
+    /**
+     * Creates an expression that checks if a string expression starts with a given [prefix].
+     *
+     * @param stringExpr The expression to check.
+     * @param prefix The prefix string expression to check for.
+     * @return A new [BooleanExpr] representing the 'starts with' comparison.
+     */
+    @JvmStatic
+    fun startsWith(stringExpr: Expr, prefix: Expr): BooleanExpr =
+      BooleanExpr("starts_with", stringExpr, prefix)
+
+    /**
+     * Creates an expression that checks if a string expression starts with a given [prefix].
+     *
+     * @param stringExpr The expression to check.
+     * @param prefix The prefix string to check for.
+     * @return A new [BooleanExpr] representing the 'starts with' comparison.
+     */
+    @JvmStatic
+    fun startsWith(stringExpr: Expr, prefix: String): BooleanExpr =
+      BooleanExpr("starts_with", stringExpr, prefix)
+
+    /**
+     * Creates an expression that checks if a string expression starts with a given [prefix].
+     *
+     * @param fieldName The name of field that contains a string to check.
+     * @param prefix The prefix string expression to check for.
+     * @return A new [BooleanExpr] representing the 'starts with' comparison.
+     */
+    @JvmStatic
+    fun startsWith(fieldName: String, prefix: Expr): BooleanExpr =
+      BooleanExpr("starts_with", fieldName, prefix)
+
+    /**
+     * Creates an expression that checks if a string expression starts with a given [prefix].
+     *
+     * @param fieldName The name of field that contains a string to check.
+     * @param prefix The prefix string to check for.
+     * @return A new [BooleanExpr] representing the 'starts with' comparison.
+     */
+    @JvmStatic
+    fun startsWith(fieldName: String, prefix: String): BooleanExpr =
+      BooleanExpr("starts_with", fieldName, prefix)
+
+    /**
+     * Creates an expression that checks if a string expression ends with a given [suffix].
+     *
+     * @param stringExpr The expression to check.
+     * @param suffix The suffix string expression to check for.
+     * @return A new [BooleanExpr] representing the 'ends with' comparison.
+     */
+    @JvmStatic
+    fun endsWith(stringExpr: Expr, suffix: Expr): BooleanExpr =
+      BooleanExpr("ends_with", stringExpr, suffix)
+
+    /**
+     * Creates an expression that checks if a string expression ends with a given [suffix].
+     *
+     * @param stringExpr The expression to check.
+     * @param suffix The suffix string to check for.
+     * @return A new [BooleanExpr] representing the 'ends with' comparison.
+     */
+    @JvmStatic
+    fun endsWith(stringExpr: Expr, suffix: String): BooleanExpr =
+      BooleanExpr("ends_with", stringExpr, suffix)
+
+    /**
+     * Creates an expression that checks if a string expression ends with a given [suffix].
+     *
+     * @param fieldName The name of field that contains a string to check.
+     * @param suffix The suffix string expression to check for.
+     * @return A new [BooleanExpr] representing the 'ends with' comparison.
+     */
+    @JvmStatic
+    fun endsWith(fieldName: String, suffix: Expr): BooleanExpr =
+      BooleanExpr("ends_with", fieldName, suffix)
+
+    /**
+     * Creates an expression that checks if a string expression ends with a given [suffix].
+     *
+     * @param fieldName The name of field that contains a string to check.
+     * @param suffix The suffix string to check for.
+     * @return A new [BooleanExpr] representing the 'ends with' comparison.
+     */
+    @JvmStatic
+    fun endsWith(fieldName: String, suffix: String): BooleanExpr =
+      BooleanExpr("ends_with", fieldName, suffix)
+
+    /**
+     * Creates an expression that converts a string expression to lowercase.
+     *
+     * @param stringExpression The expression representing the string to convert to lowercase.
+     * @return A new [Expr] representing the lowercase string.
+     */
+    @JvmStatic
+    fun toLower(stringExpression: Expr): Expr = FunctionExpr("to_lower", stringExpression)
+
+    /**
+     * Creates an expression that converts a string field to lowercase.
+     *
+     * @param fieldName The name of the field containing the string to convert to lowercase.
+     * @return A new [Expr] representing the lowercase string.
+     */
+    @JvmStatic fun toLower(fieldName: String): Expr = FunctionExpr("to_lower", fieldName)
+
+    /**
+     * Creates an expression that converts a string expression to uppercase.
+     *
+     * @param stringExpression The expression representing the string to convert to uppercase.
+     * @return A new [Expr] representing the lowercase string.
+     */
+    @JvmStatic
+    fun toUpper(stringExpression: Expr): Expr = FunctionExpr("to_upper", stringExpression)
+
+    /**
+     * Creates an expression that converts a string field to uppercase.
+     *
+     * @param fieldName The name of the field containing the string to convert to uppercase.
+     * @return A new [Expr] representing the lowercase string.
+     */
+    @JvmStatic fun toUpper(fieldName: String): Expr = FunctionExpr("to_upper", fieldName)
+
+    /**
+     * Creates an expression that removes leading and trailing whitespace from a string expression.
+     *
+     * @param stringExpression The expression representing the string to trim.
+     * @return A new [Expr] representing the trimmed string.
+     */
+    @JvmStatic fun trim(stringExpression: Expr): Expr = FunctionExpr("trim", stringExpression)
+
+    /**
+     * Creates an expression that removes leading and trailing whitespace from a string field.
+     *
+     * @param fieldName The name of the field containing the string to trim.
+     * @return A new [Expr] representing the trimmed string.
+     */
+    @JvmStatic fun trim(fieldName: String): Expr = FunctionExpr("trim", fieldName)
+
+    /**
+     * Creates an expression that concatenates string expressions together.
+     *
+     * @param firstString The expression representing the initial string value.
+     * @param otherStrings Optional additional string expressions to concatenate.
+     * @return A new [Expr] representing the concatenated string.
+     */
+    @JvmStatic
+    fun strConcat(firstString: Expr, vararg otherStrings: Expr): Expr =
+      FunctionExpr("str_concat", firstString, *otherStrings)
+
+    /**
+     * Creates an expression that concatenates string expressions together.
+     *
+     * @param firstString The expression representing the initial string value.
+     * @param otherStrings Optional additional string expressions or string constants to
+     * concatenate.
+     * @return A new [Expr] representing the concatenated string.
+     */
+    @JvmStatic
+    fun strConcat(firstString: Expr, vararg otherStrings: Any): Expr =
+      FunctionExpr("str_concat", firstString, *otherStrings)
+
+    /**
+     * Creates an expression that concatenates string expressions together.
+     *
+     * @param fieldName The field name containing the initial string value.
+     * @param otherStrings Optional additional string expressions to concatenate.
+     * @return A new [Expr] representing the concatenated string.
+     */
+    @JvmStatic
+    fun strConcat(fieldName: String, vararg otherStrings: Expr): Expr =
+      FunctionExpr("str_concat", fieldName, *otherStrings)
+
+    /**
+     * Creates an expression that concatenates string expressions together.
+     *
+     * @param fieldName The field name containing the initial string value.
+     * @param otherStrings Optional additional string expressions or string constants to
+     * concatenate.
+     * @return A new [Expr] representing the concatenated string.
+     */
+    @JvmStatic
+    fun strConcat(fieldName: String, vararg otherStrings: Any): Expr =
+      FunctionExpr("str_concat", fieldName, *otherStrings)
+
+    internal fun map(elements: Array<out Expr>): Expr = FunctionExpr("map", elements)
+
+    /**
+     * Creates an expression that creates a Firestore map value from an input object.
+     *
+     * @param elements The input map to evaluate in the expression.
+     * @return A new [Expr] representing the map function.
+     */
+    @JvmStatic
+    fun map(elements: Map<String, Any>): Expr =
+      map(elements.flatMap { listOf(constant(it.key), toExprOrConstant(it.value)) }.toTypedArray())
+
+    /**
+     * Accesses a value from a map (object) field using the provided [key].
+     *
+     * @param mapExpression The expression representing the map.
+     * @param key The key to access in the map.
+     * @return A new [Expr] representing the value associated with the given key in the map.
+     */
+    @JvmStatic
+    fun mapGet(mapExpression: Expr, key: String): Expr = FunctionExpr("map_get", mapExpression, key)
+
+    /**
+     * Accesses a value from a map (object) field using the provided [key].
+     *
+     * @param fieldName The field name of the map field.
+     * @param key The key to access in the map.
+     * @return A new [Expr] representing the value associated with the given key in the map.
+     */
+    @JvmStatic
+    fun mapGet(fieldName: String, key: String): Expr = FunctionExpr("map_get", fieldName, key)
+
+    /**
+     * Creates an expression that merges multiple maps into a single map. If multiple maps have the
+     * same key, the later value is used.
+     *
+     * @param firstMap First map expression that will be merged.
+     * @param secondMap Second map expression that will be merged.
+     * @param otherMaps Additional maps to merge.
+     * @return A new [Expr] representing the mapMerge operation.
+     */
+    @JvmStatic
+    fun mapMerge(firstMap: Expr, secondMap: Expr, vararg otherMaps: Expr): Expr =
+      FunctionExpr("map_merge", firstMap, secondMap, *otherMaps)
+
+    /**
+     * Creates an expression that merges multiple maps into a single map. If multiple maps have the
+     * same key, the later value is used.
+     *
+     * @param firstMapFieldName First map field name that will be merged.
+     * @param secondMap Second map expression that will be merged.
+     * @param otherMaps Additional maps to merge.
+     * @return A new [Expr] representing the mapMerge operation.
+     */
+    @JvmStatic
+    fun mapMerge(firstMapFieldName: String, secondMap: Expr, vararg otherMaps: Expr): Expr =
+      FunctionExpr("map_merge", firstMapFieldName, secondMap, *otherMaps)
+
+    /**
+     * Creates an expression that removes a key from the map produced by evaluating an expression.
+     *
+     * @param mapExpr An expression that evaluates to a map.
+     * @param key The name of the key to remove from the input map.
+     * @return A new [Expr] that evaluates to a modified map.
+     */
+    @JvmStatic
+    fun mapRemove(mapExpr: Expr, key: Expr): Expr = FunctionExpr("map_remove", mapExpr, key)
+
+    /**
+     * Creates an expression that removes a key from the map produced by evaluating an expression.
+     *
+     * @param mapField The name of a field containing a map value.
+     * @param key The name of the key to remove from the input map.
+     * @return A new [Expr] that evaluates to a modified map.
+     */
+    @JvmStatic
+    fun mapRemove(mapField: String, key: Expr): Expr = FunctionExpr("map_remove", mapField, key)
+
+    /**
+     * Creates an expression that removes a key from the map produced by evaluating an expression.
+     *
+     * @param mapExpr An expression that evaluates to a map.
+     * @param key The name of the key to remove from the input map.
+     * @return A new [Expr] that evaluates to a modified map.
+     */
+    @JvmStatic
+    fun mapRemove(mapExpr: Expr, key: String): Expr = FunctionExpr("map_remove", mapExpr, key)
+
+    /**
+     * Creates an expression that removes a key from the map produced by evaluating an expression.
+     *
+     * @param mapField The name of a field containing a map value.
+     * @param key The name of the key to remove from the input map.
+     * @return A new [Expr] that evaluates to a modified map.
+     */
+    @JvmStatic
+    fun mapRemove(mapField: String, key: String): Expr = FunctionExpr("map_remove", mapField, key)
+
+    /**
+     * Calculates the Cosine distance between two vector expressions.
+     *
+     * @param vector1 The first vector (represented as an Expr) to compare against.
+     * @param vector2 The other vector (represented as an Expr) to compare against.
+     * @return A new [Expr] representing the cosine distance between the two vectors.
+     */
+    @JvmStatic
+    fun cosineDistance(vector1: Expr, vector2: Expr): Expr =
+      FunctionExpr("cosine_distance", vector1, vector2)
+
+    /**
+     * Calculates the Cosine distance between vector expression and a vector literal.
+     *
+     * @param vector1 The first vector (represented as an Expr) to compare against.
+     * @param vector2 The other vector (as an array of doubles) to compare against.
+     * @return A new [Expr] representing the cosine distance between the two vectors.
+     */
+    @JvmStatic
+    fun cosineDistance(vector1: Expr, vector2: DoubleArray): Expr =
+      FunctionExpr("cosine_distance", vector1, vector(vector2))
+
+    /**
+     * Calculates the Cosine distance between vector expression and a vector literal.
+     *
+     * @param vector1 The first vector (represented as an [Expr]) to compare against.
+     * @param vector2 The other vector (represented as an [VectorValue]) to compare against.
+     * @return A new [Expr] representing the cosine distance between the two vectors.
+     */
+    @JvmStatic
+    fun cosineDistance(vector1: Expr, vector2: VectorValue): Expr =
+      FunctionExpr("cosine_distance", vector1, vector2)
+
+    /**
+     * Calculates the Cosine distance between a vector field and a vector expression.
+     *
+     * @param vectorFieldName The name of the field containing the first vector.
+     * @param vector The other vector (represented as an Expr) to compare against.
+     * @return A new [Expr] representing the cosine distance between the two vectors.
+     */
+    @JvmStatic
+    fun cosineDistance(vectorFieldName: String, vector: Expr): Expr =
+      FunctionExpr("cosine_distance", vectorFieldName, vector)
+
+    /**
+     * Calculates the Cosine distance between a vector field and a vector literal.
+     *
+     * @param vectorFieldName The name of the field containing the first vector.
+     * @param vector The other vector (as an array of doubles) to compare against.
+     * @return A new [Expr] representing the cosine distance between the two vectors.
+     */
+    @JvmStatic
+    fun cosineDistance(vectorFieldName: String, vector: DoubleArray): Expr =
+      FunctionExpr("cosine_distance", vectorFieldName, vector(vector))
+
+    /**
+     * Calculates the Cosine distance between a vector field and a vector literal.
+     *
+     * @param vectorFieldName The name of the field containing the first vector.
+     * @param vector The other vector (represented as an [VectorValue]) to compare against.
+     * @return A new [Expr] representing the cosine distance between the two vectors.
+     */
+    @JvmStatic
+    fun cosineDistance(vectorFieldName: String, vector: VectorValue): Expr =
+      FunctionExpr("cosine_distance", vectorFieldName, vector)
+
+    /**
+     * Calculates the dot product distance between two vector expressions.
+     *
+     * @param vector1 The first vector (represented as an Expr) to compare against.
+     * @param vector2 The other vector (represented as an Expr) to compare against.
+     * @return A new [Expr] representing the dot product distance between the two vectors.
+     */
+    @JvmStatic
+    fun dotProduct(vector1: Expr, vector2: Expr): Expr =
+      FunctionExpr("dot_product", vector1, vector2)
+
+    /**
+     * Calculates the dot product distance between vector expression and a vector literal.
+     *
+     * @param vector1 The first vector (represented as an Expr) to compare against.
+     * @param vector2 The other vector (as an array of doubles) to compare against.
+     * @return A new [Expr] representing the dot product distance between the two vectors.
+     */
+    @JvmStatic
+    fun dotProduct(vector1: Expr, vector2: DoubleArray): Expr =
+      FunctionExpr("dot_product", vector1, vector(vector2))
+
+    /**
+     * Calculates the dot product distance between vector expression and a vector literal.
+     *
+     * @param vector1 The first vector (represented as an [Expr]) to compare against.
+     * @param vector2 The other vector (represented as an [VectorValue]) to compare against.
+     * @return A new [Expr] representing the dot product distance between the two vectors.
+     */
+    @JvmStatic
+    fun dotProduct(vector1: Expr, vector2: VectorValue): Expr =
+      FunctionExpr("dot_product", vector1, vector2)
+
+    /**
+     * Calculates the dot product distance between a vector field and a vector expression.
+     *
+     * @param vectorFieldName The name of the field containing the first vector.
+     * @param vector The other vector (represented as an Expr) to compare against.
+     * @return A new [Expr] representing the dot product distance between the two vectors.
+     */
+    @JvmStatic
+    fun dotProduct(vectorFieldName: String, vector: Expr): Expr =
+      FunctionExpr("dot_product", vectorFieldName, vector)
+
+    /**
+     * Calculates the dot product distance between vector field and a vector literal.
+     *
+     * @param vectorFieldName The name of the field containing the first vector.
+     * @param vector The other vector (as an array of doubles) to compare against.
+     * @return A new [Expr] representing the dot product distance between the two vectors.
+     */
+    @JvmStatic
+    fun dotProduct(vectorFieldName: String, vector: DoubleArray): Expr =
+      FunctionExpr("dot_product", vectorFieldName, vector(vector))
+
+    /**
+     * Calculates the dot product distance between a vector field and a vector literal.
+     *
+     * @param vectorFieldName The name of the field containing the first vector.
+     * @param vector The other vector (represented as an [VectorValue]) to compare against.
+     * @return A new [Expr] representing the dot product distance between the two vectors.
+     */
+    @JvmStatic
+    fun dotProduct(vectorFieldName: String, vector: VectorValue): Expr =
+      FunctionExpr("dot_product", vectorFieldName, vector)
+
+    /**
+     * Calculates the Euclidean distance between two vector expressions.
+     *
+     * @param vector1 The first vector (represented as an Expr) to compare against.
+     * @param vector2 The other vector (represented as an Expr) to compare against.
+     * @return A new [Expr] representing the Euclidean distance between the two vectors.
+     */
+    @JvmStatic
+    fun euclideanDistance(vector1: Expr, vector2: Expr): Expr =
+      FunctionExpr("euclidean_distance", vector1, vector2)
+
+    /**
+     * Calculates the Euclidean distance between vector expression and a vector literal.
+     *
+     * @param vector1 The first vector (represented as an Expr) to compare against.
+     * @param vector2 The other vector (as an array of doubles) to compare against.
+     * @return A new [Expr] representing the Euclidean distance between the two vectors.
+     */
+    @JvmStatic
+    fun euclideanDistance(vector1: Expr, vector2: DoubleArray): Expr =
+      FunctionExpr("euclidean_distance", vector1, vector(vector2))
+
+    /**
+     * Calculates the Euclidean distance between vector expression and a vector literal.
+     *
+     * @param vector1 The first vector (represented as an [Expr]) to compare against.
+     * @param vector2 The other vector (represented as an [VectorValue]) to compare against.
+     * @return A new [Expr] representing the Euclidean distance between the two vectors.
+     */
+    @JvmStatic
+    fun euclideanDistance(vector1: Expr, vector2: VectorValue): Expr =
+      FunctionExpr("euclidean_distance", vector1, vector2)
+
+    /**
+     * Calculates the Euclidean distance between a vector field and a vector expression.
+     *
+     * @param vectorFieldName The name of the field containing the first vector.
+     * @param vector The other vector (represented as an Expr) to compare against.
+     * @return A new [Expr] representing the Euclidean distance between the two vectors.
+     */
+    @JvmStatic
+    fun euclideanDistance(vectorFieldName: String, vector: Expr): Expr =
+      FunctionExpr("euclidean_distance", vectorFieldName, vector)
+
+    /**
+     * Calculates the Euclidean distance between a vector field and a vector literal.
+     *
+     * @param vectorFieldName The name of the field containing the first vector.
+     * @param vector The other vector (as an array of doubles) to compare against.
+     * @return A new [Expr] representing the Euclidean distance between the two vectors.
+     */
+    @JvmStatic
+    fun euclideanDistance(vectorFieldName: String, vector: DoubleArray): Expr =
+      FunctionExpr("euclidean_distance", vectorFieldName, vector(vector))
+
+    /**
+     * Calculates the Euclidean distance between a vector field and a vector literal.
+     *
+     * @param vectorFieldName The name of the field containing the first vector.
+     * @param vector The other vector (represented as an [VectorValue]) to compare against.
+     * @return A new [Expr] representing the Euclidean distance between the two vectors.
+     */
+    @JvmStatic
+    fun euclideanDistance(vectorFieldName: String, vector: VectorValue): Expr =
+      FunctionExpr("euclidean_distance", vectorFieldName, vector)
+
+    /**
+     * Creates an expression that calculates the length (dimension) of a Firestore Vector.
+     *
+     * @param vectorExpression The expression representing the Firestore Vector.
+     * @return A new [Expr] representing the length (dimension) of the vector.
+     */
+    @JvmStatic
+    fun vectorLength(vectorExpression: Expr): Expr = FunctionExpr("vector_length", vectorExpression)
+
+    /**
+     * Creates an expression that calculates the length (dimension) of a Firestore Vector.
+     *
+     * @param fieldName The name of the field containing the Firestore Vector.
+     * @return A new [Expr] representing the length (dimension) of the vector.
+     */
+    @JvmStatic fun vectorLength(fieldName: String): Expr = FunctionExpr("vector_length", fieldName)
+
+    /**
+     * Creates an expression that interprets an expression as the number of microseconds since the
+     * Unix epoch (1970-01-01 00:00:00 UTC) and returns a timestamp.
+     *
+     * @param expr The expression representing the number of microseconds since epoch.
+     * @return A new [Expr] representing the timestamp.
+     */
+    @JvmStatic
+    fun unixMicrosToTimestamp(expr: Expr): Expr = FunctionExpr("unix_micros_to_timestamp", expr)
+
+    /**
+     * Creates an expression that interprets a field's value as the number of microseconds since the
+     * Unix epoch (1970-01-01 00:00:00 UTC) and returns a timestamp.
+     *
+     * @param fieldName The name of the field containing the number of microseconds since epoch.
+     * @return A new [Expr] representing the timestamp.
+     */
+    @JvmStatic
+    fun unixMicrosToTimestamp(fieldName: String): Expr =
+      FunctionExpr("unix_micros_to_timestamp", fieldName)
+
+    /**
+     * Creates an expression that converts a timestamp expression to the number of microseconds
+     * since the Unix epoch (1970-01-01 00:00:00 UTC).
+     *
+     * @param expr The expression representing the timestamp.
+     * @return A new [Expr] representing the number of microseconds since epoch.
+     */
+    @JvmStatic
+    fun timestampToUnixMicros(expr: Expr): Expr = FunctionExpr("timestamp_to_unix_micros", expr)
+
+    /**
+     * Creates an expression that converts a timestamp field to the number of microseconds since the
+     * Unix epoch (1970-01-01 00:00:00 UTC).
+     *
+     * @param fieldName The name of the field that contains the timestamp.
+     * @return A new [Expr] representing the number of microseconds since epoch.
+     */
+    @JvmStatic
+    fun timestampToUnixMicros(fieldName: String): Expr =
+      FunctionExpr("timestamp_to_unix_micros", fieldName)
+
+    /**
+     * Creates an expression that interprets an expression as the number of milliseconds since the
+     * Unix epoch (1970-01-01 00:00:00 UTC) and returns a timestamp.
+     *
+     * @param expr The expression representing the number of milliseconds since epoch.
+     * @return A new [Expr] representing the timestamp.
+     */
+    @JvmStatic
+    fun unixMillisToTimestamp(expr: Expr): Expr = FunctionExpr("unix_millis_to_timestamp", expr)
+
+    /**
+     * Creates an expression that interprets a field's value as the number of milliseconds since the
+     * Unix epoch (1970-01-01 00:00:00 UTC) and returns a timestamp.
+     *
+     * @param fieldName The name of the field containing the number of milliseconds since epoch.
+     * @return A new [Expr] representing the timestamp.
+     */
+    @JvmStatic
+    fun unixMillisToTimestamp(fieldName: String): Expr =
+      FunctionExpr("unix_millis_to_timestamp", fieldName)
+
+    /**
+     * Creates an expression that converts a timestamp expression to the number of milliseconds
+     * since the Unix epoch (1970-01-01 00:00:00 UTC).
+     *
+     * @param expr The expression representing the timestamp.
+     * @return A new [Expr] representing the number of milliseconds since epoch.
+     */
+    @JvmStatic
+    fun timestampToUnixMillis(expr: Expr): Expr = FunctionExpr("timestamp_to_unix_millis", expr)
+
+    /**
+     * Creates an expression that converts a timestamp field to the number of milliseconds since the
+     * Unix epoch (1970-01-01 00:00:00 UTC).
+     *
+     * @param fieldName The name of the field that contains the timestamp.
+     * @return A new [Expr] representing the number of milliseconds since epoch.
+     */
+    @JvmStatic
+    fun timestampToUnixMillis(fieldName: String): Expr =
+      FunctionExpr("timestamp_to_unix_millis", fieldName)
+
+    /**
+     * Creates an expression that interprets an expression as the number of seconds since the Unix
+     * epoch (1970-01-01 00:00:00 UTC) and returns a timestamp.
+     *
+     * @param expr The expression representing the number of seconds since epoch.
+     * @return A new [Expr] representing the timestamp.
+     */
+    @JvmStatic
+    fun unixSecondsToTimestamp(expr: Expr): Expr = FunctionExpr("unix_seconds_to_timestamp", expr)
+
+    /**
+     * Creates an expression that interprets a field's value as the number of seconds since the Unix
+     * epoch (1970-01-01 00:00:00 UTC) and returns a timestamp.
+     *
+     * @param fieldName The name of the field containing the number of seconds since epoch.
+     * @return A new [Expr] representing the timestamp.
+     */
+    @JvmStatic
+    fun unixSecondsToTimestamp(fieldName: String): Expr =
+      FunctionExpr("unix_seconds_to_timestamp", fieldName)
+
+    /**
+     * Creates an expression that converts a timestamp expression to the number of seconds since the
+     * Unix epoch (1970-01-01 00:00:00 UTC).
+     *
+     * @param expr The expression representing the timestamp.
+     * @return A new [Expr] representing the number of seconds since epoch.
+     */
+    @JvmStatic
+    fun timestampToUnixSeconds(expr: Expr): Expr = FunctionExpr("timestamp_to_unix_seconds", expr)
+
+    /**
+     * Creates an expression that converts a timestamp field to the number of seconds since the Unix
+     * epoch (1970-01-01 00:00:00 UTC).
+     *
+     * @param fieldName The name of the field that contains the timestamp.
+     * @return A new [Expr] representing the number of seconds since epoch.
+     */
+    @JvmStatic
+    fun timestampToUnixSeconds(fieldName: String): Expr =
+      FunctionExpr("timestamp_to_unix_seconds", fieldName)
+
+    /**
+     * Creates an expression that adds a specified amount of time to a timestamp.
+     *
+     * @param timestamp The expression representing the timestamp.
+     * @param unit The expression representing the unit of time to add. Valid units include
+     * "microsecond", "millisecond", "second", "minute", "hour" and "day".
+     * @param amount The expression representing the amount of time to add.
+     * @return A new [Expr] representing the resulting timestamp.
+     */
+    @JvmStatic
+    fun timestampAdd(timestamp: Expr, unit: Expr, amount: Expr): Expr =
+      FunctionExpr("timestamp_add", timestamp, unit, amount)
+
+    /**
+     * Creates an expression that adds a specified amount of time to a timestamp.
+     *
+     * @param timestamp The expression representing the timestamp.
+     * @param unit The unit of time to add. Valid units include "microsecond", "millisecond",
+     * "second", "minute", "hour" and "day".
+     * @param amount The amount of time to add.
+     * @return A new [Expr] representing the resulting timestamp.
+     */
+    @JvmStatic
+    fun timestampAdd(timestamp: Expr, unit: String, amount: Double): Expr =
+      FunctionExpr("timestamp_add", timestamp, unit, amount)
+
+    /**
+     * Creates an expression that adds a specified amount of time to a timestamp.
+     *
+     * @param fieldName The name of the field that contains the timestamp.
+     * @param unit The expression representing the unit of time to add. Valid units include
+     * "microsecond", "millisecond", "second", "minute", "hour" and "day".
+     * @param amount The expression representing the amount of time to add.
+     * @return A new [Expr] representing the resulting timestamp.
+     */
+    @JvmStatic
+    fun timestampAdd(fieldName: String, unit: Expr, amount: Expr): Expr =
+      FunctionExpr("timestamp_add", fieldName, unit, amount)
+
+    /**
+     * Creates an expression that adds a specified amount of time to a timestamp.
+     *
+     * @param fieldName The name of the field that contains the timestamp.
+     * @param unit The unit of time to add. Valid units include "microsecond", "millisecond",
+     * "second", "minute", "hour" and "day".
+     * @param amount The amount of time to add.
+     * @return A new [Expr] representing the resulting timestamp.
+     */
+    @JvmStatic
+    fun timestampAdd(fieldName: String, unit: String, amount: Double): Expr =
+      FunctionExpr("timestamp_add", fieldName, unit, amount)
+
+    /**
+     * Creates an expression that subtracts a specified amount of time to a timestamp.
+     *
+     * @param timestamp The expression representing the timestamp.
+     * @param unit The expression representing the unit of time to subtract. Valid units include
+     * "microsecond", "millisecond", "second", "minute", "hour" and "day".
+     * @param amount The expression representing the amount of time to subtract.
+     * @return A new [Expr] representing the resulting timestamp.
+     */
+    @JvmStatic
+    fun timestampSub(timestamp: Expr, unit: Expr, amount: Expr): Expr =
+      FunctionExpr("timestamp_sub", timestamp, unit, amount)
+
+    /**
+     * Creates an expression that subtracts a specified amount of time to a timestamp.
+     *
+     * @param timestamp The expression representing the timestamp.
+     * @param unit The unit of time to subtract. Valid units include "microsecond", "millisecond",
+     * "second", "minute", "hour" and "day".
+     * @param amount The amount of time to subtract.
+     * @return A new [Expr] representing the resulting timestamp.
+     */
+    @JvmStatic
+    fun timestampSub(timestamp: Expr, unit: String, amount: Double): Expr =
+      FunctionExpr("timestamp_sub", timestamp, unit, amount)
+
+    /**
+     * Creates an expression that subtracts a specified amount of time to a timestamp.
+     *
+     * @param fieldName The name of the field that contains the timestamp.
+     * @param unit The unit of time to subtract. Valid units include "microsecond", "millisecond",
+     * "second", "minute", "hour" and "day".
+     * @param amount The amount of time to subtract.
+     * @return A new [Expr] representing the resulting timestamp.
+     */
+    @JvmStatic
+    fun timestampSub(fieldName: String, unit: Expr, amount: Expr): Expr =
+      FunctionExpr("timestamp_sub", fieldName, unit, amount)
+
+    /**
+     * Creates an expression that subtracts a specified amount of time to a timestamp.
+     *
+     * @param fieldName The name of the field that contains the timestamp.
+     * @param unit The unit of time to subtract. Valid units include "microsecond", "millisecond",
+     * "second", "minute", "hour" and "day".
+     * @param amount The amount of time to subtract.
+     * @return A new [Expr] representing the resulting timestamp.
+     */
+    @JvmStatic
+    fun timestampSub(fieldName: String, unit: String, amount: Double): Expr =
+      FunctionExpr("timestamp_sub", fieldName, unit, amount)
+
+    /**
+     * Creates an expression that checks if two expressions are equal.
+     *
+     * @param left The first expression to compare.
+     * @param right The second expression to compare to.
+     * @return A new [BooleanExpr] representing the equality comparison.
+     */
+    @JvmStatic fun eq(left: Expr, right: Expr): BooleanExpr = BooleanExpr("eq", left, right)
+
+    /**
+     * Creates an expression that checks if an expression is equal to a value.
+     *
+     * @param left The first expression to compare.
+     * @param right The value to compare to.
+     * @return A new [BooleanExpr] representing the equality comparison.
+     */
+    @JvmStatic fun eq(left: Expr, right: Any): BooleanExpr = BooleanExpr("eq", left, right)
+
+    /**
+     * Creates an expression that checks if a field's value is equal to an expression.
+     *
+     * @param fieldName The field name to compare.
+     * @param expression The expression to compare to.
+     * @return A new [BooleanExpr] representing the equality comparison.
+     */
+    @JvmStatic
+    fun eq(fieldName: String, expression: Expr): BooleanExpr =
+      BooleanExpr("eq", fieldName, expression)
+
+    /**
+     * Creates an expression that checks if a field's value is equal to another value.
+     *
+     * @param fieldName The field name to compare.
+     * @param value The value to compare to.
+     * @return A new [BooleanExpr] representing the equality comparison.
+     */
+    @JvmStatic
+    fun eq(fieldName: String, value: Any): BooleanExpr = BooleanExpr("eq", fieldName, value)
+
+    /**
+     * Creates an expression that checks if two expressions are not equal.
+     *
+     * @param left The first expression to compare.
+     * @param right The second expression to compare to.
+     * @return A new [BooleanExpr] representing the inequality comparison.
+     */
+    @JvmStatic fun neq(left: Expr, right: Expr): BooleanExpr = BooleanExpr("neq", left, right)
+
+    /**
+     * Creates an expression that checks if an expression is not equal to a value.
+     *
+     * @param left The first expression to compare.
+     * @param right The value to compare to.
+     * @return A new [BooleanExpr] representing the inequality comparison.
+     */
+    @JvmStatic fun neq(left: Expr, right: Any): BooleanExpr = BooleanExpr("neq", left, right)
+
+    /**
+     * Creates an expression that checks if a field's value is not equal to an expression.
+     *
+     * @param fieldName The field name to compare.
+     * @param expression The expression to compare to.
+     * @return A new [BooleanExpr] representing the inequality comparison.
+     */
+    @JvmStatic
+    fun neq(fieldName: String, expression: Expr): BooleanExpr =
+      BooleanExpr("neq", fieldName, expression)
+
+    /**
+     * Creates an expression that checks if a field's value is not equal to another value.
+     *
+     * @param fieldName The field name to compare.
+     * @param value The value to compare to.
+     * @return A new [BooleanExpr] representing the inequality comparison.
+     */
+    @JvmStatic
+    fun neq(fieldName: String, value: Any): BooleanExpr = BooleanExpr("neq", fieldName, value)
+
+    /**
+     * Creates an expression that checks if the first expression is greater than the second
+     * expression.
+     *
+     * @param left The first expression to compare.
+     * @param right The second expression to compare to.
+     * @return A new [BooleanExpr] representing the greater than comparison.
+     */
+    @JvmStatic fun gt(left: Expr, right: Expr): BooleanExpr = BooleanExpr("gt", left, right)
+
+    /**
+     * Creates an expression that checks if an expression is greater than a value.
+     *
+     * @param left The first expression to compare.
+     * @param right The value to compare to.
+     * @return A new [BooleanExpr] representing the greater than comparison.
+     */
+    @JvmStatic fun gt(left: Expr, right: Any): BooleanExpr = BooleanExpr("gt", left, right)
+
+    /**
+     * Creates an expression that checks if a field's value is greater than an expression.
+     *
+     * @param fieldName The field name to compare.
+     * @param expression The expression to compare to.
+     * @return A new [BooleanExpr] representing the greater than comparison.
+     */
+    @JvmStatic
+    fun gt(fieldName: String, expression: Expr): BooleanExpr =
+      BooleanExpr("gt", fieldName, expression)
+
+    /**
+     * Creates an expression that checks if a field's value is greater than another value.
+     *
+     * @param fieldName The field name to compare.
+     * @param value The value to compare to.
+     * @return A new [BooleanExpr] representing the greater than comparison.
+     */
+    @JvmStatic
+    fun gt(fieldName: String, value: Any): BooleanExpr = BooleanExpr("gt", fieldName, value)
+
+    /**
+     * Creates an expression that checks if the first expression is greater than or equal to the
+     * second expression.
+     *
+     * @param left The first expression to compare.
+     * @param right The second expression to compare to.
+     * @return A new [BooleanExpr] representing the greater than or equal to comparison.
+     */
+    @JvmStatic fun gte(left: Expr, right: Expr): BooleanExpr = BooleanExpr("gte", left, right)
+
+    /**
+     * Creates an expression that checks if an expression is greater than or equal to a value.
+     *
+     * @param left The first expression to compare.
+     * @param right The value to compare to.
+     * @return A new [BooleanExpr] representing the greater than or equal to comparison.
+     */
+    @JvmStatic fun gte(left: Expr, right: Any): BooleanExpr = BooleanExpr("gte", left, right)
+
+    /**
+     * Creates an expression that checks if a field's value is greater than or equal to an
+     * expression.
+     *
+     * @param fieldName The field name to compare.
+     * @param expression The expression to compare to.
+     * @return A new [BooleanExpr] representing the greater than or equal to comparison.
+     */
+    @JvmStatic
+    fun gte(fieldName: String, expression: Expr): BooleanExpr =
+      BooleanExpr("gte", fieldName, expression)
+
+    /**
+     * Creates an expression that checks if a field's value is greater than or equal to another
+     * value.
+     *
+     * @param fieldName The field name to compare.
+     * @param value The value to compare to.
+     * @return A new [BooleanExpr] representing the greater than or equal to comparison.
+     */
+    @JvmStatic
+    fun gte(fieldName: String, value: Any): BooleanExpr = BooleanExpr("gte", fieldName, value)
+
+    /**
+     * Creates an expression that checks if the first expression is less than the second expression.
+     *
+     * @param left The first expression to compare.
+     * @param right The second expression to compare to.
+     * @return A new [BooleanExpr] representing the less than comparison.
+     */
+    @JvmStatic fun lt(left: Expr, right: Expr): BooleanExpr = BooleanExpr("lt", left, right)
+
+    /**
+     * Creates an expression that checks if an expression is less than a value.
+     *
+     * @param left The first expression to compare.
+     * @param right The value to compare to.
+     * @return A new [BooleanExpr] representing the less than comparison.
+     */
+    @JvmStatic fun lt(left: Expr, right: Any): BooleanExpr = BooleanExpr("lt", left, right)
+
+    /**
+     * Creates an expression that checks if a field's value is less than an expression.
+     *
+     * @param fieldName The field name to compare.
+     * @param expression The expression to compare to.
+     * @return A new [BooleanExpr] representing the less than comparison.
+     */
+    @JvmStatic
+    fun lt(fieldName: String, expression: Expr): BooleanExpr =
+      BooleanExpr("lt", fieldName, expression)
+
+    /**
+     * Creates an expression that checks if a field's value is less than another value.
+     *
+     * @param fieldName The field name to compare.
+     * @param value The value to compare to.
+     * @return A new [BooleanExpr] representing the less than comparison.
+     */
+    @JvmStatic
+    fun lt(fieldName: String, right: Any): BooleanExpr = BooleanExpr("lt", fieldName, right)
+
+    /**
+     * Creates an expression that checks if the first expression is less than or equal to the second
+     * expression.
+     *
+     * @param left The first expression to compare.
+     * @param right The second expression to compare to.
+     * @return A new [BooleanExpr] representing the less than or equal to comparison.
+     */
+    @JvmStatic fun lte(left: Expr, right: Expr): BooleanExpr = BooleanExpr("lte", left, right)
+
+    /**
+     * Creates an expression that checks if an expression is less than or equal to a value.
+     *
+     * @param left The first expression to compare.
+     * @param right The value to compare to.
+     * @return A new [BooleanExpr] representing the less than or equal to comparison.
+     */
+    @JvmStatic fun lte(left: Expr, right: Any): BooleanExpr = BooleanExpr("lte", left, right)
+
+    /**
+     * Creates an expression that checks if a field's value is less than or equal to an expression.
+     *
+     * @param fieldName The field name to compare.
+     * @param expression The expression to compare to.
+     * @return A new [BooleanExpr] representing the less than or equal to comparison.
+     */
+    @JvmStatic
+    fun lte(fieldName: String, expression: Expr): BooleanExpr =
+      BooleanExpr("lte", fieldName, expression)
+
+    /**
+     * Creates an expression that checks if a field's value is less than or equal to another value.
+     *
+     * @param fieldName The field name to compare.
+     * @param value The value to compare to.
+     * @return A new [BooleanExpr] representing the less than or equal to comparison.
+     */
+    @JvmStatic
+    fun lte(fieldName: String, value: Any): BooleanExpr = BooleanExpr("lte", fieldName, value)
+
+    /**
+     * Creates an expression that concatenates an array with other arrays.
+     *
+     * @param firstArray The first array expression to concatenate to.
+     * @param secondArray An expression that evaluates to array to concatenate.
+     * @param otherArrays Optional additional array expressions or array literals to concatenate.
+     * @return A new [Expr] representing the arrayConcat operation.
+     */
+    @JvmStatic
+    fun arrayConcat(firstArray: Expr, secondArray: Expr, vararg otherArrays: Any): Expr =
+      FunctionExpr("array_concat", firstArray, secondArray, *otherArrays)
+
+    /**
+     * Creates an expression that concatenates an array with other arrays.
+     *
+     * @param firstArray The first array expression to concatenate to.
+     * @param secondArray An array expression or array literal to concatenate.
+     * @param otherArrays Optional additional array expressions or array literals to concatenate.
+     * @return A new [Expr] representing the arrayConcat operation.
+     */
+    @JvmStatic
+    fun arrayConcat(firstArray: Expr, secondArray: Any, vararg otherArrays: Any): Expr =
+      FunctionExpr("array_concat", firstArray, secondArray, *otherArrays)
+
+    /**
+     * Creates an expression that concatenates a field's array value with other arrays.
+     *
+     * @param firstArrayField The name of field that contains first array to concatenate to.
+     * @param secondArray An expression that evaluates to array to concatenate.
+     * @param otherArrays Optional additional array expressions or array literals to concatenate.
+     * @return A new [Expr] representing the arrayConcat operation.
+     */
+    @JvmStatic
+    fun arrayConcat(firstArrayField: String, secondArray: Expr, vararg otherArrays: Any): Expr =
+      FunctionExpr("array_concat", firstArrayField, secondArray, *otherArrays)
+
+    /**
+     * Creates an expression that concatenates a field's array value with other arrays.
+     *
+     * @param firstArrayField The name of field that contains first array to concatenate to.
+     * @param secondArray An array expression or array literal to concatenate.
+     * @param otherArrays Optional additional array expressions or array literals to concatenate.
+     * @return A new [Expr] representing the arrayConcat operation.
+     */
+    @JvmStatic
+    fun arrayConcat(firstArrayField: String, secondArray: Any, vararg otherArrays: Any): Expr =
+      FunctionExpr("array_concat", firstArrayField, secondArray, *otherArrays)
+
+    /**
+     * Reverses the order of elements in the [array].
+     *
+     * @param array The array expression to reverse.
+     * @return A new [Expr] representing the arrayReverse operation.
+     */
+    @JvmStatic fun arrayReverse(array: Expr): Expr = FunctionExpr("array_reverse", array)
+
+    /**
+     * Reverses the order of elements in the array field.
+     *
+     * @param arrayFieldName The name of field that contains the array to reverse.
+     * @return A new [Expr] representing the arrayReverse operation.
+     */
+    @JvmStatic
+    fun arrayReverse(arrayFieldName: String): Expr = FunctionExpr("array_reverse", arrayFieldName)
+
+    /**
+     * Creates an expression that checks if the array contains a specific [element].
+     *
+     * @param array The array expression to check.
+     * @param element The element to search for in the array.
+     * @return A new [BooleanExpr] representing the arrayContains operation.
+     */
+    @JvmStatic
+    fun arrayContains(array: Expr, element: Expr): BooleanExpr =
+      BooleanExpr("array_contains", array, element)
+
+    /**
+     * Creates an expression that checks if the array field contains a specific [element].
+     *
+     * @param arrayFieldName The name of field that contains array to check.
+     * @param element The element to search for in the array.
+     * @return A new [BooleanExpr] representing the arrayContains operation.
+     */
+    @JvmStatic
+    fun arrayContains(arrayFieldName: String, element: Expr) =
+      BooleanExpr("array_contains", arrayFieldName, element)
+
+    /**
+     * Creates an expression that checks if the [array] contains a specific [element].
+     *
+     * @param array The array expression to check.
+     * @param element The element to search for in the array.
+     * @return A new [BooleanExpr] representing the arrayContains operation.
+     */
+    @JvmStatic
+    fun arrayContains(array: Expr, element: Any): BooleanExpr =
+      BooleanExpr("array_contains", array, element)
+
+    /**
+     * Creates an expression that checks if the array field contains a specific [element].
+     *
+     * @param arrayFieldName The name of field that contains array to check.
+     * @param element The element to search for in the array.
+     * @return A new [BooleanExpr] representing the arrayContains operation.
+     */
+    @JvmStatic
+    fun arrayContains(arrayFieldName: String, element: Any) =
+      BooleanExpr("array_contains", arrayFieldName, element)
+
+    /**
+     * Creates an expression that checks if [array] contains all the specified [values].
+     *
+     * @param array The array expression to check.
+     * @param values The elements to check for in the array.
+     * @return A new [BooleanExpr] representing the arrayContainsAll operation.
+     */
+    @JvmStatic
+    fun arrayContainsAll(array: Expr, values: List<Any>) =
+      arrayContainsAll(array, ListOfExprs(toArrayOfExprOrConstant(values)))
+
+    /**
+     * Creates an expression that checks if [array] contains all elements of [arrayExpression].
+     *
+     * @param array The array expression to check.
+     * @param arrayExpression The elements to check for in the array.
+     * @return A new [BooleanExpr] representing the arrayContainsAll operation.
+     */
+    @JvmStatic
+    fun arrayContainsAll(array: Expr, arrayExpression: Expr) =
+      BooleanExpr("array_contains_all", array, arrayExpression)
+
+    /**
+     * Creates an expression that checks if array field contains all the specified [values].
+     *
+     * @param arrayFieldName The name of field that contains array to check.
+     * @param values The elements to check for in the array.
+     * @return A new [BooleanExpr] representing the arrayContainsAll operation.
+     */
+    @JvmStatic
+    fun arrayContainsAll(arrayFieldName: String, values: List<Any>) =
+      BooleanExpr(
+        "array_contains_all",
+        arrayFieldName,
+        ListOfExprs(toArrayOfExprOrConstant(values))
+      )
+
+    /**
+     * Creates an expression that checks if array field contains all elements of [arrayExpression].
+     *
+     * @param arrayFieldName The name of field that contains array to check.
+     * @param arrayExpression The elements to check for in the array.
+     * @return A new [BooleanExpr] representing the arrayContainsAll operation.
+     */
+    @JvmStatic
+    fun arrayContainsAll(arrayFieldName: String, arrayExpression: Expr) =
+      BooleanExpr("array_contains_all", arrayFieldName, arrayExpression)
+
+    /**
+     * Creates an expression that checks if [array] contains any of the specified [values].
+     *
+     * @param array The array expression to check.
+     * @param values The elements to check for in the array.
+     * @return A new [BooleanExpr] representing the arrayContainsAny operation.
+     */
+    @JvmStatic
+    fun arrayContainsAny(array: Expr, values: List<Any>) =
+      BooleanExpr("array_contains_any", array, ListOfExprs(toArrayOfExprOrConstant(values)))
+
+    /**
+     * Creates an expression that checks if [array] contains any elements of [arrayExpression].
+     *
+     * @param array The array expression to check.
+     * @param arrayExpression The elements to check for in the array.
+     * @return A new [BooleanExpr] representing the arrayContainsAny operation.
+     */
+    @JvmStatic
+    fun arrayContainsAny(array: Expr, arrayExpression: Expr) =
+      BooleanExpr("array_contains_any", array, arrayExpression)
+
+    /**
+     * Creates an expression that checks if array field contains any of the specified [values].
+     *
+     * @param arrayFieldName The name of field that contains array to check.
+     * @param values The elements to check for in the array.
+     * @return A new [BooleanExpr] representing the arrayContainsAny operation.
+     */
+    @JvmStatic
+    fun arrayContainsAny(arrayFieldName: String, values: List<Any>) =
+      BooleanExpr(
+        "array_contains_any",
+        arrayFieldName,
+        ListOfExprs(toArrayOfExprOrConstant(values))
+      )
+
+    /**
+     * Creates an expression that checks if array field contains any elements of [arrayExpression].
+     *
+     * @param arrayFieldName The name of field that contains array to check.
+     * @param arrayExpression The elements to check for in the array.
+     * @return A new [BooleanExpr] representing the arrayContainsAny operation.
+     */
+    @JvmStatic
+    fun arrayContainsAny(arrayFieldName: String, arrayExpression: Expr) =
+      BooleanExpr("array_contains_any", arrayFieldName, arrayExpression)
+
+    /**
+     * Creates an expression that calculates the length of an [array] expression.
+     *
+     * @param array The array expression to calculate the length of.
+     * @return A new [Expr] representing the length of the array.
+     */
+    @JvmStatic fun arrayLength(array: Expr): Expr = FunctionExpr("array_length", array)
+
+    /**
+     * Creates an expression that calculates the length of an array field.
+     *
+     * @param arrayFieldName The name of the field containing an array to calculate the length of.
+     * @return A new [Expr] representing the length of the array.
+     */
+    @JvmStatic
+    fun arrayLength(arrayFieldName: String): Expr = FunctionExpr("array_length", arrayFieldName)
+
+    /**
+     * Creates an expression that indexes into an array from the beginning or end and return the
+     * element. If the offset exceeds the array length, an error is returned. A negative offset,
+     * starts from the end.
+     *
+     * @param array An [Expr] evaluating to an array.
+     * @param offset An Expr evaluating to the index of the element to return.
+     * @return A new [Expr] representing the arrayOffset operation.
+     */
+    @JvmStatic
+    fun arrayOffset(array: Expr, offset: Expr): Expr = FunctionExpr("array_offset", array, offset)
+
+    /**
+     * Creates an expression that indexes into an array from the beginning or end and return the
+     * element. If the offset exceeds the array length, an error is returned. A negative offset,
+     * starts from the end.
+     *
+     * @param array An [Expr] evaluating to an array.
+     * @param offset The index of the element to return.
+     * @return A new [Expr] representing the arrayOffset operation.
+     */
+    @JvmStatic
+    fun arrayOffset(array: Expr, offset: Int): Expr =
+      FunctionExpr("array_offset", array, constant(offset))
+
+    /**
+     * Creates an expression that indexes into an array from the beginning or end and return the
+     * element. If the offset exceeds the array length, an error is returned. A negative offset,
+     * starts from the end.
+     *
+     * @param arrayFieldName The name of an array field.
+     * @param offset An Expr evaluating to the index of the element to return.
+     * @return A new [Expr] representing the arrayOffset operation.
+     */
+    @JvmStatic
+    fun arrayOffset(arrayFieldName: String, offset: Expr): Expr =
+      FunctionExpr("array_offset", arrayFieldName, offset)
+
+    /**
+     * Creates an expression that indexes into an array from the beginning or end and return the
+     * element. If the offset exceeds the array length, an error is returned. A negative offset,
+     * starts from the end.
+     *
+     * @param arrayFieldName The name of an array field.
+     * @param offset The index of the element to return.
+     * @return A new [Expr] representing the arrayOffset operation.
+     */
+    @JvmStatic
+    fun arrayOffset(arrayFieldName: String, offset: Int): Expr =
+      FunctionExpr("array_offset", arrayFieldName, constant(offset))
+
+    /**
+     * Creates a conditional expression that evaluates to a [thenExpr] expression if a condition is
+     * true or an [elseExpr] expression if the condition is false.
+     *
+     * @param condition The condition to evaluate.
+     * @param thenExpr The expression to evaluate if the condition is true.
+     * @param elseExpr The expression to evaluate if the condition is false.
+     * @return A new [Expr] representing the conditional operation.
+     */
+    @JvmStatic
+    fun cond(condition: BooleanExpr, thenExpr: Expr, elseExpr: Expr): Expr =
+      FunctionExpr("cond", condition, thenExpr, elseExpr)
+
+    /**
+     * Creates a conditional expression that evaluates to a [thenValue] if a condition is true or an
+     * [elseValue] if the condition is false.
+     *
+     * @param condition The condition to evaluate.
+     * @param thenValue Value if the condition is true.
+     * @param elseValue Value if the condition is false.
+     * @return A new [Expr] representing the conditional operation.
+     */
+    @JvmStatic
+    fun cond(condition: BooleanExpr, thenValue: Any, elseValue: Any): Expr =
+      FunctionExpr("cond", condition, thenValue, elseValue)
+
+    /**
+     * Creates an expression that checks if a field exists.
+     *
+     * @param value An expression evaluates to the name of the field to check.
+     * @return A new [Expr] representing the exists check.
+     */
+    @JvmStatic fun exists(value: Expr): BooleanExpr = BooleanExpr("exists", value)
+
+    /**
+     * Creates an expression that checks if a field exists.
+     *
+     * @param fieldName The field name to check.
+     * @return A new [Expr] representing the exists check.
+     */
+    @JvmStatic fun exists(fieldName: String): BooleanExpr = BooleanExpr("exists", fieldName)
+
+    /**
+     * Creates an expression that returns the [catchExpr] argument if there is an error, else return
+     * the result of the [tryExpr] argument evaluation.
+     *
+     * @param tryExpr The try expression.
+     * @param catchExpr The catch expression that will be evaluated and returned if the [tryExpr]
+     * produces an error.
+     * @return A new [Expr] representing the ifError operation.
+     */
+    @JvmStatic
+    fun ifError(tryExpr: Expr, catchExpr: Expr): Expr = FunctionExpr("if_error", tryExpr, catchExpr)
+
+    /**
+     * Creates an expression that returns the [catchExpr] argument if there is an error, else return
+     * the result of the [tryExpr] argument evaluation.
+     *
+     * This overload will return [BooleanExpr] when both parameters are also [BooleanExpr].
+     *
+     * @param tryExpr The try boolean expression.
+     * @param catchExpr The catch boolean expression that will be evaluated and returned if the [tryExpr]
+     * produces an error.
+     * @return A new [BooleanExpr] representing the ifError operation.
+     */
+    @JvmStatic
+    fun ifError(tryExpr: BooleanExpr, catchExpr: BooleanExpr): BooleanExpr = BooleanExpr("if_error", tryExpr, catchExpr)
+
+    /**
+     * Creates an expression that returns the [catchValue] argument if there is an error, else
+     * return the result of the [tryExpr] argument evaluation.
+     *
+     * @param tryExpr The try expression.
+     * @param catchValue The value that will be returned if the [tryExpr] produces an error.
+     * @return A new [Expr] representing the ifError operation.
+     */
+    @JvmStatic
+    fun ifError(tryExpr: Expr, catchValue: Any): Expr =
+      FunctionExpr("if_error", tryExpr, catchValue)
+
+    /**
+     * Creates an expression that returns the document ID from a path.
+     *
+     * @param documentPath An expression the evaluates to document path.
+     * @return A new [Expr] representing the documentId operation.
+     */
+    @JvmStatic fun documentId(documentPath: Expr): Expr = FunctionExpr("document_id", documentPath)
+
+    /**
+     * Creates an expression that returns the document ID from a path.
+     *
+     * @param documentPath The string representation of the document path.
+     * @return A new [Expr] representing the documentId operation.
+     */
+    @JvmStatic fun documentId(documentPath: String): Expr = documentId(constant(documentPath))
+
+    /**
+     * Creates an expression that returns the document ID from a [DocumentReference].
+     *
+     * @param docRef The [DocumentReference].
+     * @return A new [Expr] representing the documentId operation.
+     */
+    @JvmStatic fun documentId(docRef: DocumentReference): Expr = documentId(constant(docRef))
+  }
+
+  /**
+   * Creates an expression that applies a bitwise AND operation with other expression.
+   *
+   * @param bitsOther An expression that returns bits when evaluated.
+   * @return A new [Expr] representing the bitwise AND operation.
+   */
+  fun bitAnd(bitsOther: Expr): Expr = Companion.bitAnd(this, bitsOther)
+
+  /**
+   * Creates an expression that applies a bitwise AND operation with a constant.
+   *
+   * @param bitsOther A constant byte array.
+   * @return A new [Expr] representing the bitwise AND operation.
+   */
+  fun bitAnd(bitsOther: ByteArray): Expr = Companion.bitAnd(this, bitsOther)
+
+  /**
+   * Creates an expression that applies a bitwise OR operation with other expression.
+   *
+   * @param bitsOther An expression that returns bits when evaluated.
+   * @return A new [Expr] representing the bitwise OR operation.
+   */
+  fun bitOr(bitsOther: Expr): Expr = Companion.bitOr(this, bitsOther)
+
+  /**
+   * Creates an expression that applies a bitwise OR operation with a constant.
+   *
+   * @param bitsOther A constant byte array.
+   * @return A new [Expr] representing the bitwise OR operation.
+   */
+  fun bitOr(bitsOther: ByteArray): Expr = Companion.bitOr(this, bitsOther)
+
+  /**
+   * Creates an expression that applies a bitwise XOR operation with an expression.
+   *
+   * @param bitsOther An expression that returns bits when evaluated.
+   * @return A new [Expr] representing the bitwise XOR operation.
+   */
+  fun bitXor(bitsOther: Expr): Expr = Companion.bitXor(this, bitsOther)
+
+  /**
+   * Creates an expression that applies a bitwise XOR operation with a constant.
+   *
+   * @param bitsOther A constant byte array.
+   * @return A new [Expr] representing the bitwise XOR operation.
+   */
+  fun bitXor(bitsOther: ByteArray): Expr = Companion.bitXor(this, bitsOther)
+
+  /**
+   * Creates an expression that applies a bitwise NOT operation to this expression.
+   *
+   * @return A new [Expr] representing the bitwise NOT operation.
+   */
+  fun bitNot(): Expr = Companion.bitNot(this)
+
+  /**
+   * Creates an expression that applies a bitwise left shift operation with an expression.
+   *
+   * @param numberExpr The number of bits to shift.
+   * @return A new [Expr] representing the bitwise left shift operation.
+   */
+  fun bitLeftShift(numberExpr: Expr): Expr = Companion.bitLeftShift(this, numberExpr)
+
+  /**
+   * Creates an expression that applies a bitwise left shift operation with a constant.
+   *
+   * @param number The number of bits to shift.
+   * @return A new [Expr] representing the bitwise left shift operation.
+   */
+  fun bitLeftShift(number: Int): Expr = Companion.bitLeftShift(this, number)
+
+  /**
+   * Creates an expression that applies a bitwise right shift operation with an expression.
+   *
+   * @param numberExpr The number of bits to shift.
+   * @return A new [Expr] representing the bitwise right shift operation.
+   */
+  fun bitRightShift(numberExpr: Expr): Expr = Companion.bitRightShift(this, numberExpr)
+
+  /**
+   * Creates an expression that applies a bitwise right shift operation with a constant.
+   *
+   * @param number The number of bits to shift.
+   * @return A new [Expr] representing the bitwise right shift operation.
+   */
+  fun bitRightShift(number: Int): Expr = Companion.bitRightShift(this, number)
+
+  /**
+   * Assigns an alias to this expression.
+   *
+   * Aliases are useful for renaming fields in the output of a stage or for giving meaningful names
+   * to calculated values.
+   *
+   * @param alias The alias to assign to this expression.
+   * @return A new [Selectable] (typically an [ExprWithAlias]) that wraps this expression and
+   * associates it with the provided alias.
+   */
+  open fun alias(alias: String) = ExprWithAlias(alias, this)
+
+  /**
+   * Creates an expression that returns the document ID from this path expression.
+   *
+   * @return A new [Expr] representing the documentId operation.
+   */
+  fun documentId(): Expr = Companion.documentId(this)
+
+  /**
+   * Creates an expression that adds this numeric expression to another numeric expression.
+   *
+   * @param second Numeric expression to add.
+   * @return A new [Expr] representing the addition operation.
+   */
+  fun add(second: Expr): Expr = Companion.add(this, second)
+
+  /**
+   * Creates an expression that adds this numeric expression to a constants.
+   *
+   * @param second Constant to add.
+   * @return A new [Expr] representing the addition operation.
+   */
+  fun add(second: Number): Expr = Companion.add(this, second)
+
+  /**
+   * Creates an expression that subtracts a constant from this numeric expression.
+   *
+   * @param subtrahend Numeric expression to subtract.
+   * @return A new [Expr] representing the subtract operation.
+   */
+  fun subtract(subtrahend: Expr): Expr = Companion.subtract(this, subtrahend)
+
+  /**
+   * Creates an expression that subtracts a numeric expressions from this numeric expression.
+   *
+   * @param subtrahend Constant to subtract.
+   * @return A new [Expr] representing the subtract operation.
+   */
+  fun subtract(subtrahend: Number): Expr = Companion.subtract(this, subtrahend)
+
+  /**
+   * Creates an expression that multiplies this numeric expression with another numeric expression.
+   *
+   * @param second Numeric expression to multiply.
+   * @return A new [Expr] representing the multiplication operation.
+   */
+  fun multiply(second: Expr): Expr = Companion.multiply(this, second)
+
+  /**
+   * Creates an expression that multiplies this numeric expression with a constant.
+   *
+   * @param second Constant to multiply.
+   * @return A new [Expr] representing the multiplication operation.
+   */
+  fun multiply(second: Number): Expr = Companion.multiply(this, second)
+
+  /**
+   * Creates an expression that divides this numeric expression by another numeric expression.
+   *
+   * @param divisor Numeric expression to divide this numeric expression by.
+   * @return A new [Expr] representing the division operation.
+   */
+  fun divide(divisor: Expr): Expr = Companion.divide(this, divisor)
+
+  /**
+   * Creates an expression that divides this numeric expression by a constant.
+   *
+   * @param divisor Constant to divide this expression by.
+   * @return A new [Expr] representing the division operation.
+   */
+  fun divide(divisor: Number): Expr = Companion.divide(this, divisor)
+
+  /**
+   * Creates an expression that calculates the modulo (remainder) of dividing this numeric
+   * expressions by another numeric expression.
+   *
+   * @param divisor The numeric expression to divide this expression by.
+   * @return A new [Expr] representing the modulo operation.
+   */
+  fun mod(divisor: Expr): Expr = Companion.mod(this, divisor)
+
+  /**
+   * Creates an expression that calculates the modulo (remainder) of dividing this numeric
+   * expressions by a constant.
+   *
+   * @param divisor The constant to divide this expression by.
+   * @return A new [Expr] representing the modulo operation.
+   */
+  fun mod(divisor: Number): Expr = Companion.mod(this, divisor)
+
+  /**
+   * Creates an expression that rounds this numeric expression to nearest integer.
+   *
+   * Rounds away from zero in halfway cases.
+   *
+   * @return A new [Expr] representing an integer result from the round operation.
+   */
+  fun round(): Expr = Companion.round(this)
+
+  /**
+   * Creates an expression that rounds off this numeric expression to [decimalPlace] decimal places
+   * if [decimalPlace] is positive, rounds off digits to the left of the decimal point if
+   * [decimalPlace] is negative. Rounds away from zero in halfway cases.
+   *
+   * @param decimalPlace The number of decimal places to round.
+   * @return A new [Expr] representing the round operation.
+   */
+  fun roundToPrecision(decimalPlace: Int): Expr = Companion.roundToPrecision(this, decimalPlace)
+
+  /**
+   * Creates an expression that rounds off this numeric expression to [decimalPlace] decimal places
+   * if [decimalPlace] is positive, rounds off digits to the left of the decimal point if
+   * [decimalPlace] is negative. Rounds away from zero in halfway cases.
+   *
+   * @param decimalPlace The number of decimal places to round.
+   * @return A new [Expr] representing the round operation.
+   */
+  fun roundToPrecision(decimalPlace: Expr): Expr = Companion.roundToPrecision(this, decimalPlace)
+
+  /**
+   * Creates an expression that returns the smalled integer that isn't less than this numeric
+   * expression.
+   *
+   * @return A new [Expr] representing an integer result from the ceil operation.
+   */
+  fun ceil(): Expr = Companion.ceil(this)
+
+  /**
+   * Creates an expression that returns the largest integer that isn't less than this numeric
+   * expression.
+   *
+   * @return A new [Expr] representing an integer result from the floor operation.
+   */
+  fun floor(): Expr = Companion.floor(this)
+
+  /**
+   * Creates an expression that returns this numeric expression raised to the power of the
+   * [exponent]. Returns infinity on overflow and zero on underflow.
+   *
+   * @param exponent The numeric power to raise this numeric expression.
+   * @return A new [Expr] representing a numeric result from raising this numeric expression to the
+   * power of [exponent].
+   */
+  fun pow(exponent: Number): Expr = Companion.pow(this, exponent)
+
+  /**
+   * Creates an expression that returns this numeric expression raised to the power of the
+   * [exponent]. Returns infinity on overflow and zero on underflow.
+   *
+   * @param exponent The numeric power to raise this numeric expression.
+   * @return A new [Expr] representing a numeric result from raising this numeric expression to the
+   * power of [exponent].
+   */
+  fun pow(exponent: Expr): Expr = Companion.pow(this, exponent)
+
+  /**
+   * Creates an expression that returns the square root of this numeric expression.
+   *
+   * @return A new [Expr] representing the numeric result of the square root operation.
+   */
+  fun sqrt(): Expr = Companion.sqrt(this)
+
+  /**
+   * Creates an expression that checks if this expression, when evaluated, is equal to any of the
+   * provided [values].
+   *
+   * @param values The values to check against.
+   * @return A new [BooleanExpr] representing the 'IN' comparison.
+   */
+  fun eqAny(values: List<Any>): BooleanExpr = Companion.eqAny(this, values)
+
+  /**
+   * Creates an expression that checks if this expression, when evaluated, is equal to any of the
+   * elements of [arrayExpression].
+   *
+   * @param arrayExpression An expression that evaluates to an array, whose elements to check for
+   * equality to the input.
+   * @return A new [BooleanExpr] representing the 'IN' comparison.
+   */
+  fun eqAny(arrayExpression: Expr): BooleanExpr = Companion.eqAny(this, arrayExpression)
+
+  /**
+   * Creates an expression that checks if this expression, when evaluated, is not equal to all the
+   * provided [values].
+   *
+   * @param values The values to check against.
+   * @return A new [BooleanExpr] representing the 'NOT IN' comparison.
+   */
+  fun notEqAny(values: List<Any>): BooleanExpr = Companion.notEqAny(this, values)
+
+  /**
+   * Creates an expression that checks if this expression, when evaluated, is not equal to all the
+   * elements of [arrayExpression].
+   *
+   * @param arrayExpression An expression that evaluates to an array, whose elements to check for
+   * equality to the input.
+   * @return A new [BooleanExpr] representing the 'NOT IN' comparison.
+   */
+  fun notEqAny(arrayExpression: Expr): BooleanExpr = Companion.notEqAny(this, arrayExpression)
+
+  /**
+   * Creates an expression that returns true if yhe result of this expression is absent. Otherwise,
+   * returns false even if the value is null.
+   *
+   * @return A new [BooleanExpr] representing the isAbsent operation.
+   */
+  fun isAbsent(): BooleanExpr = Companion.isAbsent(this)
+
+  /**
+   * Creates an expression that checks if this expression evaluates to 'NaN' (Not a Number).
+   *
+   * @return A new [BooleanExpr] representing the isNan operation.
+   */
+  fun isNan(): BooleanExpr = Companion.isNan(this)
+
+  /**
+   * Creates an expression that checks if the results of this expression is NOT 'NaN' (Not a
+   * Number).
+   *
+   * @return A new [BooleanExpr] representing the isNotNan operation.
+   */
+  fun isNotNan(): BooleanExpr = Companion.isNotNan(this)
+
+  /**
+   * Creates an expression that checks if tbe result of this expression is null.
+   *
+   * @return A new [BooleanExpr] representing the isNull operation.
+   */
+  fun isNull(): BooleanExpr = Companion.isNull(this)
+
+  /**
+   * Creates an expression that checks if tbe result of this expression is not null.
+   *
+   * @return A new [BooleanExpr] representing the isNotNull operation.
+   */
+  fun isNotNull(): BooleanExpr = Companion.isNotNull(this)
+
+  /**
+   * Creates an expression that replaces the first occurrence of a substring within this string
+   * expression.
+   *
+   * @param find The expression representing the substring to search for in this expressions.
+   * @param replace The expression representing the replacement for the first occurrence of [find].
+   * @return A new [Expr] representing the string with the first occurrence replaced.
+   */
+  fun replaceFirst(find: Expr, replace: Expr) = Companion.replaceFirst(this, find, replace)
+
+  /**
+   * Creates an expression that replaces the first occurrence of a substring within this string
+   * expression.
+   *
+   * @param find The substring to search for in this string expression.
+   * @param replace The replacement for the first occurrence of [find] with.
+   * @return A new [Expr] representing the string with the first occurrence replaced.
+   */
+  fun replaceFirst(find: String, replace: String) = Companion.replaceFirst(this, find, replace)
+
+  /**
+   * Creates an expression that replaces all occurrences of a substring within this string
+   * expression.
+   *
+   * @param find The expression representing the substring to search for in this string expression.
+   * @param replace The expression representing the replacement for all occurrences of [find].
+   * @return A new [Expr] representing the string with all occurrences replaced.
+   */
+  fun replaceAll(find: Expr, replace: Expr) = Companion.replaceAll(this, find, replace)
+
+  /**
+   * Creates an expression that replaces all occurrences of a substring within this string
+   * expression.
+   *
+   * @param find The substring to search for in this string expression.
+   * @param replace The replacement for all occurrences of [find] with.
+   * @return A new [Expr] representing the string with all occurrences replaced.
+   */
+  fun replaceAll(find: String, replace: String) = Companion.replaceAll(this, find, replace)
+
+  /**
+   * Creates an expression that calculates the character length of this string expression in UTF8.
+   *
+   * @return A new [Expr] representing the charLength operation.
+   */
+  fun charLength(): Expr = Companion.charLength(this)
+
+  /**
+   * Creates an expression that calculates the length of a string in UTF-8 bytes, or just the length
+   * of a Blob.
+   *
+   * @return A new [Expr] representing the length of the string in bytes.
+   */
+  fun byteLength(): Expr = Companion.byteLength(this)
+
+  /**
+   * Creates an expression that performs a case-sensitive wildcard string comparison.
+   *
+   * @param pattern The pattern to search for. You can use "%" as a wildcard character.
+   * @return A new [BooleanExpr] representing the like operation.
+   */
+  fun like(pattern: Expr): BooleanExpr = Companion.like(this, pattern)
+
+  /**
+   * Creates an expression that performs a case-sensitive wildcard string comparison.
+   *
+   * @param pattern The pattern to search for. You can use "%" as a wildcard character.
+   * @return A new [BooleanExpr] representing the like operation.
+   */
+  fun like(pattern: String): BooleanExpr = Companion.like(this, pattern)
+
+  /**
+   * Creates an expression that checks if this string expression contains a specified regular
+   * expression as a substring.
+   *
+   * @param pattern The regular expression to use for the search.
+   * @return A new [BooleanExpr] representing the contains regular expression comparison.
+   */
+  fun regexContains(pattern: Expr): BooleanExpr = Companion.regexContains(this, pattern)
+
+  /**
+   * Creates an expression that checks if this string expression contains a specified regular
+   * expression as a substring.
+   *
+   * @param pattern The regular expression to use for the search.
+   * @return A new [BooleanExpr] representing the contains regular expression comparison.
+   */
+  fun regexContains(pattern: String): BooleanExpr = Companion.regexContains(this, pattern)
+
+  /**
+   * Creates an expression that checks if this string expression matches a specified regular
+   * expression.
+   *
+   * @param pattern The regular expression to use for the match.
+   * @return A new [BooleanExpr] representing the regular expression match comparison.
+   */
+  fun regexMatch(pattern: Expr): BooleanExpr = Companion.regexMatch(this, pattern)
+
+  /**
+   * Creates an expression that checks if this string expression matches a specified regular
+   * expression.
+   *
+   * @param pattern The regular expression to use for the match.
+   * @return A new [BooleanExpr] representing the regular expression match comparison.
+   */
+  fun regexMatch(pattern: String): BooleanExpr = Companion.regexMatch(this, pattern)
+
+  /**
+   * Creates an expression that returns the largest value between multiple input expressions or
+   * literal values. Based on Firestore's value type ordering.
+   *
+   * @param others Expressions or literals.
+   * @return A new [Expr] representing the logical maximum operation.
+   */
+  fun logicalMaximum(vararg others: Expr): Expr = Companion.logicalMaximum(this, *others)
+
+  /**
+   * Creates an expression that returns the largest value between multiple input expressions or
+   * literal values. Based on Firestore's value type ordering.
+   *
+   * @param others Expressions or literals.
+   * @return A new [Expr] representing the logical maximum operation.
+   */
+  fun logicalMaximum(vararg others: Any): Expr = Companion.logicalMaximum(this, *others)
+
+  /**
+   * Creates an expression that returns the smallest value between multiple input expressions or
+   * literal values. Based on Firestore's value type ordering.
+   *
+   * @param others Expressions or literals.
+   * @return A new [Expr] representing the logical minimum operation.
+   */
+  fun logicalMinimum(vararg others: Expr): Expr = Companion.logicalMinimum(this, *others)
+
+  /**
+   * Creates an expression that returns the smallest value between multiple input expressions or
+   * literal values. Based on Firestore's value type ordering.
+   *
+   * @param others Expressions or literals.
+   * @return A new [Expr] representing the logical minimum operation.
+   */
+  fun logicalMinimum(vararg others: Any): Expr = Companion.logicalMinimum(this, *others)
+
+  /**
+   * Creates an expression that reverses this string expression.
+   *
+   * @return A new [Expr] representing the reversed string.
+   */
+  fun reverse(): Expr = Companion.reverse(this)
+
+  /**
+   * Creates an expression that checks if this string expression contains a specified substring.
+   *
+   * @param substring The expression representing the substring to search for.
+   * @return A new [BooleanExpr] representing the contains comparison.
+   */
+  fun strContains(substring: Expr): BooleanExpr = Companion.strContains(this, substring)
+
+  /**
+   * Creates an expression that checks if this string expression contains a specified substring.
+   *
+   * @param substring The substring to search for.
+   * @return A new [BooleanExpr] representing the contains comparison.
+   */
+  fun strContains(substring: String): BooleanExpr = Companion.strContains(this, substring)
+
+  /**
+   * Creates an expression that checks if this string expression starts with a given [prefix].
+   *
+   * @param prefix The prefix string expression to check for.
+   * @return A new [Expr] representing the the 'starts with' comparison.
+   */
+  fun startsWith(prefix: Expr): BooleanExpr = Companion.startsWith(this, prefix)
+
+  /**
+   * Creates an expression that checks if this string expression starts with a given [prefix].
+   *
+   * @param prefix The prefix string expression to check for.
+   * @return A new [Expr] representing the 'starts with' comparison.
+   */
+  fun startsWith(prefix: String): BooleanExpr = Companion.startsWith(this, prefix)
+
+  /**
+   * Creates an expression that checks if this string expression ends with a given [suffix].
+   *
+   * @param suffix The suffix string expression to check for.
+   * @return A new [Expr] representing the 'ends with' comparison.
+   */
+  fun endsWith(suffix: Expr): BooleanExpr = Companion.endsWith(this, suffix)
+
+  /**
+   * Creates an expression that checks if this string expression ends with a given [suffix].
+   *
+   * @param suffix The suffix string to check for.
+   * @return A new [Expr] representing the the 'ends with' comparison.
+   */
+  fun endsWith(suffix: String) = Companion.endsWith(this, suffix)
+
+  /**
+   * Creates an expression that converts this string expression to lowercase.
+   *
+   * @return A new [Expr] representing the lowercase string.
+   */
+  fun toLower() = Companion.toLower(this)
+
+  /**
+   * Creates an expression that converts this string expression to uppercase.
+   *
+   * @return A new [Expr] representing the lowercase string.
+   */
+  fun toUpper() = Companion.toUpper(this)
+
+  /**
+   * Creates an expression that removes leading and trailing whitespace from this string expression.
+   *
+   * @return A new [Expr] representing the trimmed string.
+   */
+  fun trim() = Companion.trim(this)
+
+  /**
+   * Creates an expression that concatenates string expressions together.
+   *
+   * @param stringExpressions The string expressions to concatenate.
+   * @return A new [Expr] representing the concatenated string.
+   */
+  fun strConcat(vararg stringExpressions: Expr): Expr =
+    Companion.strConcat(this, *stringExpressions)
+
+  /**
+   * Creates an expression that concatenates this string expression with string constants.
+   *
+   * @param strings The string constants to concatenate.
+   * @return A new [Expr] representing the concatenated string.
+   */
+  fun strConcat(vararg strings: String): Expr = Companion.strConcat(this, *strings)
+
+  /**
+   * Creates an expression that concatenates string expressions and string constants together.
+   *
+   * @param strings The string expressions or string constants to concatenate.
+   * @return A new [Expr] representing the concatenated string.
+   */
+  fun strConcat(vararg strings: Any): Expr = Companion.strConcat(this, *strings)
+
+  /**
+   * Accesses a map (object) value using the provided [key].
+   *
+   * @param key The key to access in the map.
+   * @return A new [Expr] representing the value associated with the given key in the map.
+   */
+  fun mapGet(key: String) = Companion.mapGet(this, key)
+
+  /**
+   * Creates an expression that merges multiple maps into a single map. If multiple maps have the
+   * same key, the later value is used.
+   *
+   * @param mapExpr Map expression that will be merged.
+   * @param otherMaps Additional maps to merge.
+   * @return A new [Expr] representing the mapMerge operation.
+   */
+  fun mapMerge(mapExpr: Expr, vararg otherMaps: Expr) =
+    Companion.mapMerge(this, mapExpr, *otherMaps)
+
+  /**
+   * Creates an expression that removes a key from this map expression.
+   *
+   * @param key The name of the key to remove from this map expression.
+   * @return A new [Expr] that evaluates to a modified map.
+   */
+  fun mapRemove(key: Expr) = Companion.mapRemove(this, key)
+
+  /**
+   * Creates an expression that removes a key from this map expression.
+   *
+   * @param key The name of the key to remove from this map expression.
+   * @return A new [Expr] that evaluates to a modified map.
+   */
+  fun mapRemove(key: String) = Companion.mapRemove(this, key)
+
+  /**
+   * Calculates the Cosine distance between this and another vector expressions.
+   *
+   * @param vector The other vector (represented as an Expr) to compare against.
+   * @return A new [Expr] representing the cosine distance between the two vectors.
+   */
+  fun cosineDistance(vector: Expr): Expr = Companion.cosineDistance(this, vector)
+
+  /**
+   * Calculates the Cosine distance between this vector expression and a vector literal.
+   *
+   * @param vector The other vector (as an array of doubles) to compare against.
+   * @return A new [Expr] representing the cosine distance between the two vectors.
+   */
+  fun cosineDistance(vector: DoubleArray): Expr = Companion.cosineDistance(this, vector)
+
+  /**
+   * Calculates the Cosine distance between this vector expression and a vector literal.
+   *
+   * @param vector The other vector (represented as an [VectorValue]) to compare against.
+   * @return A new [Expr] representing the cosine distance between the two vectors.
+   */
+  fun cosineDistance(vector: VectorValue): Expr = Companion.cosineDistance(this, vector)
+
+  /**
+   * Calculates the dot product distance between this and another vector expression.
+   *
+   * @param vector The other vector (represented as an Expr) to compare against.
+   * @return A new [Expr] representing the dot product distance between the two vectors.
+   */
+  fun dotProduct(vector: Expr): Expr = Companion.dotProduct(this, vector)
+
+  /**
+   * Calculates the dot product distance between this vector expression and a vector literal.
+   *
+   * @param vector The other vector (as an array of doubles) to compare against.
+   * @return A new [Expr] representing the dot product distance between the two vectors.
+   */
+  fun dotProduct(vector: DoubleArray): Expr = Companion.dotProduct(this, vector)
+
+  /**
+   * Calculates the dot product distance between this vector expression and a vector literal.
+   *
+   * @param vector The other vector (represented as an [VectorValue]) to compare against.
+   * @return A new [Expr] representing the dot product distance between the two vectors.
+   */
+  fun dotProduct(vector: VectorValue): Expr = Companion.dotProduct(this, vector)
+
+  /**
+   * Calculates the Euclidean distance between this and another vector expression.
+   *
+   * @param vector The other vector (represented as an Expr) to compare against.
+   * @return A new [Expr] representing the Euclidean distance between the two vectors.
+   */
+  fun euclideanDistance(vector: Expr): Expr = Companion.euclideanDistance(this, vector)
+
+  /**
+   * Calculates the Euclidean distance between this vector expression and a vector literal.
+   *
+   * @param vector The other vector (as an array of doubles) to compare against.
+   * @return A new [Expr] representing the Euclidean distance between the two vectors.
+   */
+  fun euclideanDistance(vector: DoubleArray): Expr = Companion.euclideanDistance(this, vector)
+
+  /**
+   * Calculates the Euclidean distance between this vector expression and a vector literal.
+   *
+   * @param vector The other vector (represented as an [VectorValue]) to compare against.
+   * @return A new [Expr] representing the Euclidean distance between the two vectors.
+   */
+  fun euclideanDistance(vector: VectorValue): Expr = Companion.euclideanDistance(this, vector)
+
+  /**
+   * Creates an expression that calculates the length (dimension) of a Firestore Vector.
+   *
+   * @return A new [Expr] representing the length (dimension) of the vector.
+   */
+  fun vectorLength() = Companion.vectorLength(this)
+
+  /**
+   * Creates an expression that interprets this expression as the number of microseconds since the
+   * Unix epoch (1970-01-01 00:00:00 UTC) and returns a timestamp.
+   *
+   * @return A new [Expr] representing the timestamp.
+   */
+  fun unixMicrosToTimestamp() = Companion.unixMicrosToTimestamp(this)
+
+  /**
+   * Creates an expression that converts this timestamp expression to the number of microseconds
+   * since the Unix epoch (1970-01-01 00:00:00 UTC).
+   *
+   * @return A new [Expr] representing the number of microseconds since epoch.
+   */
+  fun timestampToUnixMicros() = Companion.timestampToUnixMicros(this)
+
+  /**
+   * Creates an expression that interprets this expression as the number of milliseconds since the
+   * Unix epoch (1970-01-01 00:00:00 UTC) and returns a timestamp.
+   *
+   * @return A new [Expr] representing the timestamp.
+   */
+  fun unixMillisToTimestamp() = Companion.unixMillisToTimestamp(this)
+
+  /**
+   * Creates an expression that converts this timestamp expression to the number of milliseconds
+   * since the Unix epoch (1970-01-01 00:00:00 UTC).
+   *
+   * @return A new [Expr] representing the number of milliseconds since epoch.
+   */
+  fun timestampToUnixMillis() = Companion.timestampToUnixMillis(this)
+
+  /**
+   * Creates an expression that interprets this expression as the number of seconds since the Unix
+   * epoch (1970-01-01 00:00:00 UTC) and returns a timestamp.
+   *
+   * @return A new [Expr] representing the timestamp.
+   */
+  fun unixSecondsToTimestamp() = Companion.unixSecondsToTimestamp(this)
+
+  /**
+   * Creates an expression that converts this timestamp expression to the number of seconds since
+   * the Unix epoch (1970-01-01 00:00:00 UTC).
+   *
+   * @return A new [Expr] representing the number of seconds since epoch.
+   */
+  fun timestampToUnixSeconds() = Companion.timestampToUnixSeconds(this)
+
+  /**
+   * Creates an expression that adds a specified amount of time to this timestamp expression.
+   *
+   * @param unit The expression representing the unit of time to add. Valid units include
+   * "microsecond", "millisecond", "second", "minute", "hour" and "day".
+   * @param amount The expression representing the amount of time to add.
+   * @return A new [Expr] representing the resulting timestamp.
+   */
+  fun timestampAdd(unit: Expr, amount: Expr): Expr = Companion.timestampAdd(this, unit, amount)
+
+  /**
+   * Creates an expression that adds a specified amount of time to this timestamp expression.
+   *
+   * @param unit The unit of time to add. Valid units include "microsecond", "millisecond",
+   * "second", "minute", "hour" and "day".
+   * @param amount The amount of time to add.
+   * @return A new [Expr] representing the resulting timestamp.
+   */
+  fun timestampAdd(unit: String, amount: Double): Expr = Companion.timestampAdd(this, unit, amount)
+
+  /**
+   * Creates an expression that subtracts a specified amount of time to this timestamp expression.
+   *
+   * @param unit The expression representing the unit of time to subtract. Valid units include
+   * "microsecond", "millisecond", "second", "minute", "hour" and "day".
+   * @param amount The expression representing the amount of time to subtract.
+   * @return A new [Expr] representing the resulting timestamp.
+   */
+  fun timestampSub(unit: Expr, amount: Expr): Expr = Companion.timestampSub(this, unit, amount)
+
+  /**
+   * Creates an expression that subtracts a specified amount of time to this timestamp expression.
+   *
+   * @param unit The unit of time to subtract. Valid units include "microsecond", "millisecond",
+   * "second", "minute", "hour" and "day".
+   * @param amount The amount of time to subtract.
+   * @return A new [Expr] representing the resulting timestamp.
+   */
+  fun timestampSub(unit: String, amount: Double): Expr = Companion.timestampSub(this, unit, amount)
+
+  /**
+   * Creates an expression that concatenates a field's array value with other arrays.
+   *
+   * @param secondArray An expression that evaluates to array to concatenate.
+   * @param otherArrays Optional additional array expressions or array literals to concatenate.
+   * @return A new [Expr] representing the arrayConcat operation.
+   */
+  fun arrayConcat(secondArray: Expr, vararg otherArrays: Any) =
+    Companion.arrayConcat(this, secondArray, *otherArrays)
+
+  /**
+   * Creates an expression that concatenates a field's array value with other arrays.
+   *
+   * @param secondArray An array expression or array literal to concatenate.
+   * @param otherArrays Optional additional array expressions or array literals to concatenate.
+   * @return A new [Expr] representing the arrayConcat operation.
+   */
+  fun arrayConcat(secondArray: Any, vararg otherArrays: Any) =
+    Companion.arrayConcat(this, secondArray, *otherArrays)
+
+  /**
+   * Reverses the order of elements in the array.
+   *
+   * @return A new [Expr] representing the arrayReverse operation.
+   */
+  fun arrayReverse() = Companion.arrayReverse(this)
+
+  /**
+   * Creates an expression that checks if array contains a specific [element].
+   *
+   * @param element The element to search for in the array.
+   * @return A new [BooleanExpr] representing the arrayContains operation.
+   */
+  fun arrayContains(element: Expr): BooleanExpr = Companion.arrayContains(this, element)
+
+  /**
+   * Creates an expression that checks if array contains a specific [element].
+   *
+   * @param element The element to search for in the array.
+   * @return A new [BooleanExpr] representing the arrayContains operation.
+   */
+  fun arrayContains(element: Any): BooleanExpr = Companion.arrayContains(this, element)
+
+  /**
+   * Creates an expression that checks if array contains all the specified [values].
+   *
+   * @param values The elements to check for in the array.
+   * @return A new [BooleanExpr] representing the arrayContainsAll operation.
+   */
+  fun arrayContainsAll(values: List<Any>): BooleanExpr = Companion.arrayContainsAll(this, values)
+
+  /**
+   * Creates an expression that checks if array contains all elements of [arrayExpression].
+   *
+   * @param arrayExpression The elements to check for in the array.
+   * @return A new [BooleanExpr] representing the arrayContainsAll operation.
+   */
+  fun arrayContainsAll(arrayExpression: Expr): BooleanExpr =
+    Companion.arrayContainsAll(this, arrayExpression)
+
+  /**
+   * Creates an expression that checks if array contains any of the specified [values].
+   *
+   * @param values The elements to check for in the array.
+   * @return A new [BooleanExpr] representing the arrayContainsAny operation.
+   */
+  fun arrayContainsAny(values: List<Any>): BooleanExpr = Companion.arrayContainsAny(this, values)
+
+  /**
+   * Creates an expression that checks if array contains any elements of [arrayExpression].
+   *
+   * @param arrayExpression The elements to check for in the array.
+   * @return A new [BooleanExpr] representing the arrayContainsAny operation.
+   */
+  fun arrayContainsAny(arrayExpression: Expr): BooleanExpr =
+    Companion.arrayContainsAny(this, arrayExpression)
+
+  /**
+   * Creates an expression that calculates the length of an array expression.
+   *
+   * @return A new [Expr] representing the length of the array.
+   */
+  fun arrayLength() = Companion.arrayLength(this)
+
+  /**
+   * Creates an expression that indexes into an array from the beginning or end and return the
+   * element. If the offset exceeds the array length, an error is returned. A negative offset,
+   * starts from the end.
+   *
+   * @param offset An Expr evaluating to the index of the element to return.
+   * @return A new [Expr] representing the arrayOffset operation.
+   */
+  fun arrayOffset(offset: Expr) = Companion.arrayOffset(this, offset)
+
+  /**
+   * Creates an expression that indexes into an array from the beginning or end and return the
+   * element. If the offset exceeds the array length, an error is returned. A negative offset,
+   * starts from the end.
+   *
+   * @param offset An Expr evaluating to the index of the element to return.
+   * @return A new [Expr] representing the arrayOffset operation.
+   */
+  fun arrayOffset(offset: Int) = Companion.arrayOffset(this, offset)
+
+  /**
+   * Creates an aggregation that counts the number of stage inputs with valid evaluations of the
+   * this expression.
+   *
+   * @return A new [AggregateFunction] representing the count aggregation.
+   */
+  fun count(): AggregateFunction = AggregateFunction.count(this)
+
+  /**
+   * Creates an aggregation that calculates the sum of this numeric expression across multiple stage
+   * inputs.
+   *
+   * @return A new [AggregateFunction] representing the sum aggregation.
+   */
+  fun sum(): AggregateFunction = AggregateFunction.sum(this)
+
+  /**
+   * Creates an aggregation that calculates the average (mean) of this numeric expression across
+   * multiple stage inputs.
+   *
+   * @return A new [AggregateFunction] representing the average aggregation.
+   */
+  fun avg(): AggregateFunction = AggregateFunction.avg(this)
+
+  /**
+   * Creates an aggregation that finds the minimum value of this expression across multiple stage
+   * inputs.
+   *
+   * @return A new [AggregateFunction] representing the minimum aggregation.
+   */
+  fun minimum(): AggregateFunction = AggregateFunction.minimum(this)
+
+  /**
+   * Creates an aggregation that finds the maximum value of this expression across multiple stage
+   * inputs.
+   *
+   * @return A new [AggregateFunction] representing the maximum aggregation.
+   */
+  fun maximum(): AggregateFunction = AggregateFunction.maximum(this)
+
+  /**
+   * Create an [Ordering] that sorts documents in ascending order based on value of this expression
+   *
+   * @return A new [Ordering] object with ascending sort by this expression.
+   */
+  fun ascending(): Ordering = Ordering.ascending(this)
+
+  /**
+   * Create an [Ordering] that sorts documents in descending order based on value of this expression
+   *
+   * @return A new [Ordering] object with descending sort by this expression.
+   */
+  fun descending(): Ordering = Ordering.descending(this)
+
+  /**
+   * Creates an expression that checks if this and [other] expression are equal.
+   *
+   * @param other The expression to compare to.
+   * @return A new [BooleanExpr] representing the equality comparison.
+   */
+  fun eq(other: Expr): BooleanExpr = Companion.eq(this, other)
+
+  /**
+   * Creates an expression that checks if this expression is equal to a [value].
+   *
+   * @param value The value to compare to.
+   * @return A new [BooleanExpr] representing the equality comparison.
+   */
+  fun eq(value: Any): BooleanExpr = Companion.eq(this, value)
+
+  /**
+   * Creates an expression that checks if this expressions is not equal to the [other] expression.
+   *
+   * @param other The expression to compare to.
+   * @return A new [BooleanExpr] representing the inequality comparison.
+   */
+  fun neq(other: Expr): BooleanExpr = Companion.neq(this, other)
+
+  /**
+   * Creates an expression that checks if this expression is not equal to a [value].
+   *
+   * @param value The value to compare to.
+   * @return A new [BooleanExpr] representing the inequality comparison.
+   */
+  fun neq(value: Any): BooleanExpr = Companion.neq(this, value)
+
+  /**
+   * Creates an expression that checks if this expression is greater than the [other] expression.
+   *
+   * @param other The expression to compare to.
+   * @return A new [BooleanExpr] representing the greater than comparison.
+   */
+  fun gt(other: Expr): BooleanExpr = Companion.gt(this, other)
+
+  /**
+   * Creates an expression that checks if this expression is greater than a [value].
+   *
+   * @param value The value to compare to.
+   * @return A new [BooleanExpr] representing the greater than comparison.
+   */
+  fun gt(value: Any): BooleanExpr = Companion.gt(this, value)
+
+  /**
+   * Creates an expression that checks if this expression is greater than or equal to the [other]
+   * expression.
+   *
+   * @param other The expression to compare to.
+   * @return A new [BooleanExpr] representing the greater than or equal to comparison.
+   */
+  fun gte(other: Expr): BooleanExpr = Companion.gte(this, other)
+
+  /**
+   * Creates an expression that checks if this expression is greater than or equal to a [value].
+   *
+   * @param value The value to compare to.
+   * @return A new [BooleanExpr] representing the greater than or equal to comparison.
+   */
+  fun gte(value: Any): BooleanExpr = Companion.gte(this, value)
+
+  /**
+   * Creates an expression that checks if this expression is less than the [other] expression.
+   *
+   * @param other The expression to compare to.
+   * @return A new [BooleanExpr] representing the less than comparison.
+   */
+  fun lt(other: Expr): BooleanExpr = Companion.lt(this, other)
+
+  /**
+   * Creates an expression that checks if this expression is less than a value.
+   *
+   * @param value The value to compare to.
+   * @return A new [BooleanExpr] representing the less than comparison.
+   */
+  fun lt(value: Any): BooleanExpr = Companion.lt(this, value)
+
+  /**
+   * Creates an expression that checks if this expression is less than or equal to the [other]
+   * expression.
+   *
+   * @param other The expression to compare to.
+   * @return A new [BooleanExpr] representing the less than or equal to comparison.
+   */
+  fun lte(other: Expr): BooleanExpr = Companion.lte(this, other)
+
+  /**
+   * Creates an expression that checks if this expression is less than or equal to a [value].
+   *
+   * @param value The value to compare to.
+   * @return A new [BooleanExpr] representing the less than or equal to comparison.
+   */
+  fun lte(value: Any): BooleanExpr = Companion.lte(this, value)
+
+  /**
+   * Creates an expression that checks if this expression evaluates to a name of the field that
+   * exists.
+   *
+   * @return A new [Expr] representing the exists check.
+   */
+  fun exists(): BooleanExpr = Companion.exists(this)
+
+  /**
+   * Creates an expression that returns the [catchExpr] argument if there is an error, else return
+   * the result of this expression.
+   *
+   * @param catchExpr The catch expression that will be evaluated and returned if the this
+   * expression produces an error.
+   * @return A new [Expr] representing the ifError operation.
+   */
+  fun ifError(catchExpr: Expr): Expr = Companion.ifError(this, catchExpr)
+
+  /**
+   * Creates an expression that returns the [catchValue] argument if there is an error, else return
+   * the result of this expression.
+   *
+   * @param catchValue The value that will be returned if this expression produces an error.
+   * @return A new [Expr] representing the ifError operation.
+   */
+  fun ifError(catchValue: Any): Expr = Companion.ifError(this, catchValue)
+
+  internal abstract fun toProto(userDataReader: UserDataReader): Value
+}
+
+/** Expressions that have an alias are [Selectable] */
+abstract class Selectable : Expr() {
+  internal abstract fun getAlias(): String
+  internal abstract fun getExpr(): Expr
+
+  internal companion object {
+    fun toSelectable(o: Any): Selectable {
+      return when (o) {
+        is Selectable -> o
+        is String -> field(o)
+        is FieldPath -> field(o)
+        else -> throw IllegalArgumentException("Unknown Selectable type: $o")
+      }
+    }
+  }
+}
+
+/** Represents an expression that will be given the alias in the output document. */
+class ExprWithAlias internal constructor(private val alias: String, private val expr: Expr) :
+  Selectable() {
+  override fun getAlias() = alias
+  override fun getExpr() = expr
+  override fun toProto(userDataReader: UserDataReader): Value = expr.toProto(userDataReader)
+}
+
+/**
+ * Represents a reference to a field in a Firestore document.
+ *
+ * [Field] references are used to access document field values in expressions and to specify fields
+ * for sorting, filtering, and projecting data in Firestore pipelines.
+ *
+ * You can create a [Field] instance using the static [Expr.field] method:
+ */
+class Field internal constructor(private val fieldPath: ModelFieldPath) : Selectable() {
+  companion object {
+
+    /**
+     * An expression that returns the document ID.
+     *
+     * @return An [Field] representing the document ID.
+     */
+    @JvmField val DOCUMENT_ID: Field = field(FieldPath.documentId())
+  }
+
+  override fun getAlias(): String = fieldPath.canonicalString()
+
+  override fun getExpr(): Expr = this
+
+  override fun toProto(userDataReader: UserDataReader) = toProto()
+
+  internal fun toProto(): Value =
+    Value.newBuilder().setFieldReferenceValue(fieldPath.canonicalString()).build()
+}
+
+internal class ListOfExprs(private val expressions: Array<out Expr>) : Expr() {
+  override fun toProto(userDataReader: UserDataReader): Value =
+    encodeValue(expressions.map { it.toProto(userDataReader) })
+}
+
+/**
+ * This class defines the base class for Firestore [Pipeline] functions, which can be evaluated
+ * within pipeline execution.
+ *
+ * Typically, you would not use this class or its children directly. Use either the functions like
+ * [and], [eq], or the methods on [Expr] ([Expr.eq]), [Expr.lt], etc) to construct new
+ * [FunctionExpr] instances.
+ */
+open class FunctionExpr
+internal constructor(
+  private val name: String,
+  private val params: Array<out Expr>,
+  private val options: InternalOptions = InternalOptions.EMPTY
+) : Expr() {
+  internal constructor(name: String) : this(name, emptyArray())
+  internal constructor(name: String, param: Expr) : this(name, arrayOf(param))
+  internal constructor(
+    name: String,
+    param: Expr,
+    vararg params: Any
+  ) : this(name, arrayOf(param, *toArrayOfExprOrConstant(params)))
+  internal constructor(
+    name: String,
+    param1: Expr,
+    param2: Expr
+  ) : this(name, arrayOf(param1, param2))
+  internal constructor(
+    name: String,
+    param1: Expr,
+    param2: Expr,
+    vararg params: Any
+  ) : this(name, arrayOf(param1, param2, *toArrayOfExprOrConstant(params)))
+  internal constructor(name: String, fieldName: String) : this(name, arrayOf(field(fieldName)))
+  internal constructor(
+    name: String,
+    fieldName: String,
+    vararg params: Any
+  ) : this(name, arrayOf(field(fieldName), *toArrayOfExprOrConstant(params)))
+
+  override fun toProto(userDataReader: UserDataReader): Value {
+    val builder = com.google.firestore.v1.Function.newBuilder()
+    builder.setName(name)
+    for (param in params) {
+      builder.addArgs(param.toProto(userDataReader))
+    }
+    options.forEach(builder::putOptions)
+    return Value.newBuilder().setFunctionValue(builder).build()
+  }
+}
+
+/** A class that represents a filter condition. */
+open class BooleanExpr internal constructor(name: String, params: Array<out Expr>) :
+  FunctionExpr(name, params, InternalOptions.EMPTY) {
+  internal constructor(name: String, param: Expr) : this(name, arrayOf(param))
+  internal constructor(
+    name: String,
+    param1: Expr,
+    param2: Any
+  ) : this(name, arrayOf(param1, toExprOrConstant(param2)))
+  internal constructor(
+    name: String,
+    param: Expr,
+    vararg params: Any
+  ) : this(name, arrayOf(param, *toArrayOfExprOrConstant(params)))
+  internal constructor(
+    name: String,
+    param1: Expr,
+    param2: Expr
+  ) : this(name, arrayOf(param1, param2))
+  internal constructor(name: String, fieldName: String) : this(name, arrayOf(field(fieldName)))
+  internal constructor(
+    name: String,
+    fieldName: String,
+    vararg params: Any
+  ) : this(name, arrayOf(field(fieldName), *toArrayOfExprOrConstant(params)))
+
+  companion object {
+
+    /**
+     */
+    @JvmStatic fun generic(name: String, vararg expr: Expr): BooleanExpr = BooleanExpr(name, expr)
+  }
+
+  /**
+   * Creates an aggregation that counts the number of stage inputs where the this boolean expression
+   * evaluates to true.
+   *
+   * @return A new [AggregateFunction] representing the count aggregation.
+   */
+  fun countIf(): AggregateFunction = AggregateFunction.countIf(this)
+
+  /**
+   * Creates a conditional expression that evaluates to a [thenExpr] expression if this condition is
+   * true or an [elseExpr] expression if the condition is false.
+   *
+   * @param thenExpr The expression to evaluate if the condition is true.
+   * @param elseExpr The expression to evaluate if the condition is false.
+   * @return A new [Expr] representing the conditional operation.
+   */
+  fun cond(thenExpr: Expr, elseExpr: Expr): Expr = Expr.Companion.cond(this, thenExpr, elseExpr)
+
+  /**
+   * Creates a conditional expression that evaluates to a [thenValue] if this condition is true or
+   * an [elseValue] if the condition is false.
+   *
+   * @param thenValue Value if the condition is true.
+   * @param elseValue Value if the condition is false.
+   * @return A new [Expr] representing the conditional operation.
+   */
+  fun cond(thenValue: Any, elseValue: Any): Expr = Expr.Companion.cond(this, thenValue, elseValue)
+
+  /**
+   * Creates an expression that negates this boolean expression.
+   *
+   * @return A new [BooleanExpr] representing the not operation.
+   */
+  fun not(): BooleanExpr = Expr.Companion.not(this)
+}
+
+/**
+ * Represents an ordering criterion for sorting documents in a Firestore pipeline.
+ *
+ * You create [Ordering] instances using the [ascending] and [descending] helper methods.
+ */
+class Ordering private constructor(val expr: Expr, private val dir: Direction) {
+  companion object {
+
+    /**
+     * Create an [Ordering] that sorts documents in ascending order based on value of [expr].
+     *
+     * @param expr The order is based on the evaluation of the [Expr].
+     * @return A new [Ordering] object with ascending sort by [expr].
+     */
+    @JvmStatic fun ascending(expr: Expr): Ordering = Ordering(expr, Direction.ASCENDING)
+
+    /**
+     * Creates an [Ordering] that sorts documents in ascending order based on field.
+     *
+     * @param fieldName The name of field to sort documents.
+     * @return A new [Ordering] object with ascending sort by field.
+     */
+    @JvmStatic
+    fun ascending(fieldName: String): Ordering = Ordering(field(fieldName), Direction.ASCENDING)
+
+    /**
+     * Create an [Ordering] that sorts documents in descending order based on value of [expr].
+     *
+     * @param expr The order is based on the evaluation of the [Expr].
+     * @return A new [Ordering] object with descending sort by [expr].
+     */
+    @JvmStatic fun descending(expr: Expr): Ordering = Ordering(expr, Direction.DESCENDING)
+
+    /**
+     * Creates an [Ordering] that sorts documents in descending order based on field.
+     *
+     * @param fieldName The name of field to sort documents.
+     * @return A new [Ordering] object with descending sort by field.
+     */
+    @JvmStatic
+    fun descending(fieldName: String): Ordering = Ordering(field(fieldName), Direction.DESCENDING)
+  }
+
+  private class Direction private constructor(val proto: Value) {
+    private constructor(protoString: String) : this(encodeValue(protoString))
+    companion object {
+      val ASCENDING = Direction("ascending")
+      val DESCENDING = Direction("descending")
+    }
+  }
+
+  internal fun toProto(userDataReader: UserDataReader): Value =
+    Value.newBuilder()
+      .setMapValue(
+        MapValue.newBuilder()
+          .putFields("direction", dir.proto)
+          .putFields("expression", expr.toProto(userDataReader))
+      )
+      .build()
+
+  /**
+   * Create an order that is in reverse.
+   *
+   * If the previous [Ordering] was ascending, then the new [Ordering] will be descending. Likewise,
+   * if the previous [Ordering] was descending, then the new [Ordering] will be ascending.
+   *
+   * @return New [Ordering] object that is has order reversed.
+   */
+  fun reverse(): Ordering =
+    Ordering(expr, if (dir == Direction.ASCENDING) Direction.DESCENDING else Direction.ASCENDING)
+}
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/pipeline/options.kt b/firebase-firestore/src/main/java/com/google/firebase/firestore/pipeline/options.kt
new file mode 100644
index 00000000000..27d5375f3ab
--- /dev/null
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/pipeline/options.kt
@@ -0,0 +1,219 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.firebase.firestore.pipeline
+
+import com.google.common.collect.ImmutableMap
+import com.google.firebase.firestore.model.Values
+import com.google.firestore.v1.ArrayValue
+import com.google.firestore.v1.MapValue
+import com.google.firestore.v1.Value
+
+/**
+ * Wither style Key/Value options object.
+ *
+ * Basic `wither` functionality built upon `ImmutableMap<String></String>, Value>`. Exposes methods
+ * to construct, augment, and encode Kay/Value pairs. The wrapped collection
+ * `ImmutableMap<String></String>, Value>` is an implementation detail, not to be exposed, since
+ * more efficient implementations are possible.
+ */
+class InternalOptions internal constructor(private val options: ImmutableMap<String, Value>) {
+  internal fun with(key: String, value: Value): InternalOptions {
+    val builder = ImmutableMap.builderWithExpectedSize<String, Value>(options.size + 1)
+    builder.putAll(options)
+    builder.put(key, value)
+    return InternalOptions(builder.buildKeepingLast())
+  }
+
+  internal fun with(key: String, values: Iterable<Value>): InternalOptions {
+    val arrayValue = ArrayValue.newBuilder().addAllValues(values).build()
+    return with(key, Value.newBuilder().setArrayValue(arrayValue).build())
+  }
+
+  internal fun with(key: String, value: InternalOptions): InternalOptions {
+    return with(key, value.toValue())
+  }
+
+  internal fun forEach(f: (String, Value) -> Unit) {
+    for (entry in options.entries) {
+      f(entry.key, entry.value)
+    }
+  }
+
+  private fun toValue(): Value {
+    val mapValue = MapValue.newBuilder().putAllFields(options).build()
+    return Value.newBuilder().setMapValue(mapValue).build()
+  }
+
+  companion object {
+    @JvmField val EMPTY: InternalOptions = InternalOptions(ImmutableMap.of())
+
+    fun of(key: String, value: Value): InternalOptions {
+      return InternalOptions(ImmutableMap.of(key, value))
+    }
+  }
+}
+
+abstract class AbstractOptions<T : AbstractOptions<T>>
+internal constructor(internal val options: InternalOptions) {
+
+  internal abstract fun self(options: InternalOptions): T
+
+  protected fun with(key: String, value: InternalOptions): T = self(options.with(key, value))
+
+  protected fun with(key: String, value: Value): T = self(options.with(key, value))
+
+  /**
+   * Specify generic [String] option
+   *
+   * @param key The option key
+   * @param value The [String] value of option
+   * @return A new options object.
+   */
+  fun with(key: String, value: String): T = with(key, Values.encodeValue(value))
+
+  /**
+   * Specify generic [Boolean] option
+   *
+   * @param key The option key
+   * @param value The [Boolean] value of option
+   * @return A new options object.
+   */
+  fun with(key: String, value: Boolean): T = with(key, Values.encodeValue(value))
+
+  /**
+   * Specify generic [Long] option
+   *
+   * @param key The option key
+   * @param value The [Long] value of option
+   * @return A new options object.
+   */
+  fun with(key: String, value: Long): T = with(key, Values.encodeValue(value))
+
+  /**
+   * Specify generic [Double] option
+   *
+   * @param key The option key
+   * @param value The [Double] value of option
+   * @return A new options object.
+   */
+  fun with(key: String, value: Double): T = with(key, Values.encodeValue(value))
+
+  /**
+   * Specify generic [Field] option
+   *
+   * @param key The option key
+   * @param value The [Field] value of option
+   * @return A new options object.
+   */
+  fun with(key: String, value: Field): T = with(key, value.toProto())
+
+  /**
+   * Specify [GenericOptions] object
+   *
+   * @param key The option key
+   * @param value The [GenericOptions] object
+   * @return A new options object.
+   */
+  fun with(key: String, value: GenericOptions): T = with(key, value.options)
+}
+
+class GenericOptions private constructor(options: InternalOptions) :
+  AbstractOptions<GenericOptions>(options) {
+  override fun self(options: InternalOptions) = GenericOptions(options)
+
+  companion object {
+    @JvmField val DEFAULT: GenericOptions = GenericOptions(InternalOptions.EMPTY)
+  }
+}
+
+class PipelineOptions private constructor(options: InternalOptions) :
+  AbstractOptions<PipelineOptions>(options) {
+
+  override fun self(options: InternalOptions) = PipelineOptions(options)
+
+  companion object {
+    @JvmField val DEFAULT: PipelineOptions = PipelineOptions(InternalOptions.EMPTY)
+  }
+
+  class IndexMode private constructor(internal val value: String) {
+    companion object {
+      @JvmField val RECOMMENDED = IndexMode("recommended")
+    }
+  }
+
+  fun withIndexMode(indexMode: IndexMode): PipelineOptions = with("index_mode", indexMode.value)
+
+  fun withExplainOptions(options: ExplainOptions): PipelineOptions =
+    with("explain_options", options.options)
+}
+
+class ExplainOptions private constructor(options: InternalOptions) :
+  AbstractOptions<ExplainOptions>(options) {
+  override fun self(options: InternalOptions) = ExplainOptions(options)
+
+  companion object {
+    @JvmField val DEFAULT = ExplainOptions(InternalOptions.EMPTY)
+  }
+
+  fun withMode(value: ExplainMode) = with("mode", value.value)
+
+  fun withOutputFormat(value: OutputFormat) = with("output_format", value.value)
+
+  fun withVerbosity(value: Verbosity) = with("verbosity", value.value)
+
+  fun withIndexRecommendation(value: Boolean) = with("index_recommendation", value)
+
+  fun withProfiles(value: Profiles) = with("profiles", value.value)
+
+  fun withRedact(value: Boolean) = with("redact", value)
+
+  class ExplainMode private constructor(internal val value: String) {
+    companion object {
+      @JvmField val EXECUTE = ExplainMode("execute")
+
+      @JvmField val EXPLAIN = ExplainMode("explain")
+
+      @JvmField val ANALYZE = ExplainMode("analyze")
+    }
+  }
+
+  class OutputFormat private constructor(internal val value: String) {
+    companion object {
+      @JvmField val TEXT = OutputFormat("text")
+
+      @JvmField val JSON = OutputFormat("json")
+
+      @JvmField val STRUCT = OutputFormat("struct")
+    }
+  }
+
+  class Verbosity private constructor(internal val value: String) {
+    companion object {
+      @JvmField val SUMMARY_ONLY = Verbosity("summary_only")
+
+      @JvmField val EXECUTION_TREE = Verbosity("execution_tree")
+    }
+  }
+
+  class Profiles private constructor(internal val value: String) {
+    companion object {
+      @JvmField val LATENCY = Profiles("latency")
+
+      @JvmField val RECORDS_COUNT = Profiles("records_count")
+
+      @JvmField val BYTES_THROUGHPUT = Profiles("bytes_throughput")
+    }
+  }
+}
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/pipeline/stage.kt b/firebase-firestore/src/main/java/com/google/firebase/firestore/pipeline/stage.kt
new file mode 100644
index 00000000000..6b7e4546557
--- /dev/null
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/pipeline/stage.kt
@@ -0,0 +1,671 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.firebase.firestore.pipeline
+
+import com.google.firebase.firestore.CollectionReference
+import com.google.firebase.firestore.FirebaseFirestore
+import com.google.firebase.firestore.UserDataReader
+import com.google.firebase.firestore.VectorValue
+import com.google.firebase.firestore.model.ResourcePath
+import com.google.firebase.firestore.model.Values
+import com.google.firebase.firestore.model.Values.encodeValue
+import com.google.firebase.firestore.pipeline.Expr.Companion.constant
+import com.google.firebase.firestore.pipeline.Expr.Companion.field
+import com.google.firebase.firestore.util.Preconditions
+import com.google.firestore.v1.Pipeline
+import com.google.firestore.v1.Value
+
+abstract class BaseStage<T : BaseStage<T>>
+internal constructor(protected val name: String, internal val options: InternalOptions) {
+  internal fun toProtoStage(userDataReader: UserDataReader): Pipeline.Stage {
+    val builder = Pipeline.Stage.newBuilder()
+    builder.setName(name)
+    args(userDataReader).forEach(builder::addArgs)
+    options.forEach(builder::putOptions)
+    return builder.build()
+  }
+  internal abstract fun args(userDataReader: UserDataReader): Sequence<Value>
+
+  internal abstract fun self(options: InternalOptions): T
+
+  protected fun with(key: String, value: Value): T = self(options.with(key, value))
+
+  /**
+   * Specify named [String] parameter
+   *
+   * @param key The name of parameter
+   * @param value The [String] value of parameter
+   * @return New stage with named parameter.
+   */
+  fun with(key: String, value: String): T = with(key, Values.encodeValue(value))
+
+  /**
+   * Specify named [Boolean] parameter
+   *
+   * @param key The name of parameter
+   * @param value The [Boolean] value of parameter
+   * @return New stage with named parameter.
+   */
+  fun with(key: String, value: Boolean): T = with(key, Values.encodeValue(value))
+
+  /**
+   * Specify named [Long] parameter
+   *
+   * @param key The name of parameter
+   * @param value The [Long] value of parameter
+   * @return New stage with named parameter.
+   */
+  fun with(key: String, value: Long): T = with(key, Values.encodeValue(value))
+
+  /**
+   * Specify named [Double] parameter
+   *
+   * @param key The name of parameter
+   * @param value The [Double] value of parameter
+   * @return New stage with named parameter.
+   */
+  fun with(key: String, value: Double): T = with(key, Values.encodeValue(value))
+
+  /**
+   * Specify named [Field] parameter
+   *
+   * @param key The name of parameter
+   * @param value The [Field] value of parameter
+   * @return New stage with named parameter.
+   */
+  fun with(key: String, value: Field): T = with(key, value.toProto())
+}
+
+/**
+ * Adds a stage to the pipeline by specifying the stage name as an argument. This does not offer any
+ * type safety on the stage params and requires the caller to know the order (and optionally names)
+ * of parameters accepted by the stage.
+ *
+ * This class provides a way to call stages that are supported by the Firestore backend but that are
+ * not implemented in the SDK version being used.
+ */
+class Stage
+private constructor(
+  name: String,
+  private val arguments: List<GenericArg>,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<Stage>(name, options) {
+  companion object {
+    /**
+     * Specify name of stage
+     *
+     * @param name The unique name of the stage to add.
+     * @return [Stage] with specified parameters.
+     */
+    @JvmStatic fun ofName(name: String) = Stage(name, emptyList(), InternalOptions.EMPTY)
+  }
+
+  override fun self(options: InternalOptions) = Stage(name, arguments, options)
+
+  /**
+   * Specify arguments to stage.
+   *
+   * @param arguments A list of ordered parameters to configure the stage's behavior.
+   * @return [Stage] with specified parameters.
+   */
+  fun withArguments(vararg arguments: Any): Stage =
+    Stage(name, arguments.map(GenericArg::from), options)
+
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    arguments.asSequence().map { it.toProto(userDataReader) }
+}
+
+internal sealed class GenericArg {
+  companion object {
+    fun from(arg: Any?): GenericArg =
+      when (arg) {
+        is AggregateFunction -> AggregateArg(arg)
+        is Ordering -> OrderingArg(arg)
+        is Map<*, *> ->
+          MapArg(arg.asIterable().associate { (key, value) -> key as String to from(value) })
+        is List<*> -> ListArg(arg.map(::from))
+        else -> ExprArg(Expr.toExprOrConstant(arg))
+      }
+  }
+  abstract fun toProto(userDataReader: UserDataReader): Value
+
+  data class AggregateArg(val aggregate: AggregateFunction) : GenericArg() {
+    override fun toProto(userDataReader: UserDataReader) = aggregate.toProto(userDataReader)
+  }
+
+  data class ExprArg(val expr: Expr) : GenericArg() {
+    override fun toProto(userDataReader: UserDataReader) = expr.toProto(userDataReader)
+  }
+
+  data class OrderingArg(val ordering: Ordering) : GenericArg() {
+    override fun toProto(userDataReader: UserDataReader) = ordering.toProto(userDataReader)
+  }
+
+  data class MapArg(val args: Map<String, GenericArg>) : GenericArg() {
+    override fun toProto(userDataReader: UserDataReader) =
+      encodeValue(args.mapValues { it.value.toProto(userDataReader) })
+  }
+
+  data class ListArg(val args: List<GenericArg>) : GenericArg() {
+    override fun toProto(userDataReader: UserDataReader) =
+      encodeValue(args.map { it.toProto(userDataReader) })
+  }
+}
+
+internal class DatabaseSource
+@JvmOverloads
+internal constructor(options: InternalOptions = InternalOptions.EMPTY) :
+  BaseStage<DatabaseSource>("database", options) {
+  override fun self(options: InternalOptions) = DatabaseSource(options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> = emptySequence()
+}
+
+class CollectionSource
+internal constructor(
+  private val path: String,
+  // We validate [firestore.databaseId] when adding to pipeline.
+  internal val firestore: FirebaseFirestore?,
+  options: InternalOptions
+) : BaseStage<CollectionSource>("collection", options) {
+  override fun self(options: InternalOptions): CollectionSource =
+    CollectionSource(path, firestore, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(
+      Value.newBuilder().setReferenceValue(if (path.startsWith("/")) path else "/" + path).build()
+    )
+  companion object {
+    /**
+     * Set the pipeline's source to the collection specified by the given path.
+     *
+     * @param path A path to a collection that will be the source of this pipeline.
+     * @return Pipeline with documents from target collection.
+     */
+    @JvmStatic
+    fun of(path: String): CollectionSource {
+      // Validate path by converting to ResourcePath
+      val resourcePath = ResourcePath.fromString(path)
+      return CollectionSource(resourcePath.canonicalString(), null, InternalOptions.EMPTY)
+    }
+
+    /**
+     * Set the pipeline's source to the collection specified by the given CollectionReference.
+     *
+     * @param ref A CollectionReference for a collection that will be the source of this pipeline.
+     * @return Pipeline with documents from target collection.
+     */
+    @JvmStatic
+    fun of(ref: CollectionReference): CollectionSource {
+      return CollectionSource(ref.path, ref.firestore, InternalOptions.EMPTY)
+    }
+  }
+
+  fun withForceIndex(value: String) = with("force_index", value)
+}
+
+class CollectionGroupSource
+private constructor(private val collectionId: String, options: InternalOptions) :
+  BaseStage<CollectionGroupSource>("collection_group", options) {
+  override fun self(options: InternalOptions) = CollectionGroupSource(collectionId, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(Value.newBuilder().setReferenceValue("").build(), encodeValue(collectionId))
+
+  companion object {
+
+    /**
+     * Set the pipeline's source to the collection group with the given id.
+     *
+     * @param collectionId The id of a collection group that will be the source of this pipeline.
+     */
+    @JvmStatic
+    fun of(collectionId: String): CollectionGroupSource {
+      Preconditions.checkNotNull(collectionId, "Provided collection ID must not be null.")
+      require(!collectionId.contains("/")) {
+        "Invalid collectionId '$collectionId'. Collection IDs must not contain '/'."
+      }
+      return CollectionGroupSource(collectionId, InternalOptions.EMPTY)
+    }
+  }
+
+  fun withForceIndex(value: String) = with("force_index", value)
+}
+
+internal class DocumentsSource
+@JvmOverloads
+internal constructor(
+  private val documents: Array<out String>,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<DocumentsSource>("documents", options) {
+  internal constructor(document: String) : this(arrayOf(document))
+  override fun self(options: InternalOptions) = DocumentsSource(documents, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    documents.asSequence().map { if (it.startsWith("/")) it else "/" + it }.map(::encodeValue)
+}
+
+internal class AddFieldsStage
+internal constructor(
+  private val fields: Array<out Selectable>,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<AddFieldsStage>("add_fields", options) {
+  override fun self(options: InternalOptions) = AddFieldsStage(fields, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(encodeValue(fields.associate { it.getAlias() to it.toProto(userDataReader) }))
+}
+
+/**
+ * Performs optionally grouped aggregation operations on the documents from previous stages.
+ *
+ * This stage allows you to calculate aggregate values over a set of documents, optionally grouped
+ * by one or more fields or functions. You can specify:
+ *
+ * - **Grouping Fields or Expressions:** One or more fields or functions to group the documents by.
+ * For each distinct combination of values in these fields, a separate group is created. If no
+ * grouping fields are provided, a single group containing all documents is used. Not specifying
+ * groups is the same as putting the entire inputs into one group.
+ *
+ * - **AggregateFunctions:** One or more accumulation operations to perform within each group. These
+ * are defined using [AggregateWithAlias] expressions, which are typically created by calling
+ * [AggregateFunction.alias] on [AggregateFunction] instances. Each aggregation calculates a value
+ * (e.g., sum, average, count) based on the documents within its group.
+ */
+class AggregateStage
+internal constructor(
+  private val accumulators: Map<String, AggregateFunction>,
+  private val groups: Map<String, Expr>,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<AggregateStage>("aggregate", options) {
+  private constructor(accumulators: Map<String, AggregateFunction>) : this(accumulators, emptyMap())
+  companion object {
+
+    /**
+     * Create [AggregateStage] with one or more accumulators.
+     *
+     * @param accumulator The first [AggregateWithAlias] expression, wrapping an {@link
+     * AggregateFunction} with an alias for the accumulated results.
+     * @param additionalAccumulators The [AggregateWithAlias] expressions, each wrapping an
+     * [AggregateFunction] with an alias for the accumulated results.
+     * @return [AggregateStage] with specified accumulators.
+     */
+    @JvmStatic
+    fun withAccumulators(
+      accumulator: AggregateWithAlias,
+      vararg additionalAccumulators: AggregateWithAlias
+    ): AggregateStage {
+      return AggregateStage(
+        mapOf(accumulator.alias to accumulator.expr)
+          .plus(additionalAccumulators.associate { it.alias to it.expr })
+      )
+    }
+  }
+
+  override fun self(options: InternalOptions) = AggregateStage(accumulators, groups, options)
+
+  /**
+   * Add one or more groups to [AggregateStage]
+   *
+   * @param groupField The [String] representing field name.
+   * @param additionalGroups The [Selectable] expressions to consider when determining group value
+   * combinations or [String]s representing field names.
+   * @return [AggregateStage] with specified groups.
+   */
+  fun withGroups(groupField: String, vararg additionalGroups: Any) =
+    withGroups(Expr.field(groupField), additionalGroups)
+
+  /**
+   * Add one or more groups to [AggregateStage]
+   *
+   * @param groupField The [Selectable] expression to consider when determining group value
+   * combinations.
+   * @param additionalGroups The [Selectable] expressions to consider when determining group value
+   * combinations or [String]s representing field names.
+   * @return [AggregateStage] with specified groups.
+   */
+  fun withGroups(group: Selectable, vararg additionalGroups: Any) =
+    AggregateStage(
+      accumulators,
+      mapOf(group.getAlias() to group.getExpr())
+        .plus(additionalGroups.map(Selectable::toSelectable).associateBy(Selectable::getAlias))
+    )
+
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(
+      encodeValue(accumulators.mapValues { entry -> entry.value.toProto(userDataReader) }),
+      encodeValue(groups.mapValues { entry -> entry.value.toProto(userDataReader) })
+    )
+}
+
+internal class WhereStage
+internal constructor(
+  private val condition: BooleanExpr,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<WhereStage>("where", options) {
+  override fun self(options: InternalOptions) = WhereStage(condition, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(condition.toProto(userDataReader))
+}
+
+/**
+ * Performs a vector similarity search, ordering the result set by most similar to least similar,
+ * and returning the first N documents in the result set.
+ */
+class FindNearestStage
+internal constructor(
+  private val property: Expr,
+  private val vector: Expr,
+  private val distanceMeasure: DistanceMeasure,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<FindNearestStage>("find_nearest", options) {
+
+  companion object {
+
+    /**
+     * Create [FindNearestStage].
+     *
+     * @param vectorField A [Field] that contains vector to search on.
+     * @param vectorValue The [VectorValue] used to measure the distance from [vectorField] values
+     * in the documents.
+     * @param distanceMeasure specifies what type of distance is calculated. when performing the
+     * search.
+     * @return [FindNearestStage] with specified parameters.
+     */
+    @JvmStatic
+    fun of(vectorField: Field, vectorValue: VectorValue, distanceMeasure: DistanceMeasure) =
+      FindNearestStage(vectorField, constant(vectorValue), distanceMeasure)
+
+    /**
+     * Create [FindNearestStage].
+     *
+     * @param vectorField A [Field] that contains vector to search on.
+     * @param vectorValue The [VectorValue] in array form that is used to measure the distance from
+     * [vectorField] values in the documents.
+     * @param distanceMeasure specifies what type of distance is calculated when performing the
+     * search.
+     * @return [FindNearestStage] with specified parameters.
+     */
+    @JvmStatic
+    fun of(vectorField: Field, vectorValue: DoubleArray, distanceMeasure: DistanceMeasure) =
+      FindNearestStage(vectorField, Expr.vector(vectorValue), distanceMeasure)
+
+    /**
+     * Create [FindNearestStage].
+     *
+     * @param vectorField A [String] specifying the vector field to search on.
+     * @param vectorValue The [VectorValue] used to measure the distance from [vectorField] values
+     * in the documents.
+     * @param distanceMeasure specifies what type of distance is calculated when performing the
+     * search.
+     * @return [FindNearestStage] with specified parameters.
+     */
+    @JvmStatic
+    fun of(vectorField: String, vectorValue: VectorValue, distanceMeasure: DistanceMeasure) =
+      FindNearestStage(constant(vectorField), constant(vectorValue), distanceMeasure)
+
+    /**
+     * Create [FindNearestStage].
+     *
+     * @param vectorField A [String] specifying the vector field to search on.
+     * @param vectorValue The [VectorValue] in array form that is used to measure the distance from
+     * [vectorField] values in the documents.
+     * @param distanceMeasure specifies what type of distance is calculated when performing the
+     * search.
+     * @return [FindNearestStage] with specified parameters.
+     */
+    @JvmStatic
+    fun of(vectorField: String, vectorValue: DoubleArray, distanceMeasure: DistanceMeasure) =
+      FindNearestStage(constant(vectorField), Expr.vector(vectorValue), distanceMeasure)
+  }
+
+  class DistanceMeasure private constructor(internal val proto: Value) {
+    private constructor(protoString: String) : this(encodeValue(protoString))
+
+    companion object {
+      @JvmField val EUCLIDEAN = DistanceMeasure("euclidean")
+
+      @JvmField val COSINE = DistanceMeasure("cosine")
+
+      @JvmField val DOT_PRODUCT = DistanceMeasure("dot_product")
+    }
+  }
+
+  override fun self(options: InternalOptions) =
+    FindNearestStage(property, vector, distanceMeasure, options)
+
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(
+      property.toProto(userDataReader),
+      vector.toProto(userDataReader),
+      distanceMeasure.proto
+    )
+
+  /**
+   * Specifies the upper bound of documents to return.
+   *
+   * @param limit must be a positive integer.
+   * @return [FindNearestStage] with specified [limit].
+   */
+  fun withLimit(limit: Long): FindNearestStage = with("limit", limit)
+
+  /**
+   * Add a field containing the distance to the result.
+   *
+   * @param distanceField The [Field] that will be added to the result.
+   * @return [FindNearestStage] with specified [distanceField].
+   */
+  fun withDistanceField(distanceField: Field): FindNearestStage =
+    with("distance_field", distanceField)
+
+  /**
+   * Add a field containing the distance to the result.
+   *
+   * @param distanceField The name of the field that will be added to the result.
+   * @return [FindNearestStage] with specified [distanceField].
+   */
+  fun withDistanceField(distanceField: String): FindNearestStage =
+    withDistanceField(field(distanceField))
+}
+
+internal class LimitStage
+internal constructor(private val limit: Int, options: InternalOptions = InternalOptions.EMPTY) :
+  BaseStage<LimitStage>("limit", options) {
+  override fun self(options: InternalOptions) = LimitStage(limit, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(encodeValue(limit))
+}
+
+internal class OffsetStage
+internal constructor(private val offset: Int, options: InternalOptions = InternalOptions.EMPTY) :
+  BaseStage<OffsetStage>("offset", options) {
+  override fun self(options: InternalOptions) = OffsetStage(offset, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(encodeValue(offset))
+}
+
+internal class SelectStage
+internal constructor(
+  private val fields: Array<out Selectable>,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<SelectStage>("select", options) {
+  override fun self(options: InternalOptions) = SelectStage(fields, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(encodeValue(fields.associate { it.getAlias() to it.toProto(userDataReader) }))
+}
+
+internal class SortStage
+internal constructor(
+  private val orders: Array<out Ordering>,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<SortStage>("sort", options) {
+  override fun self(options: InternalOptions) = SortStage(orders, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    orders.asSequence().map { it.toProto(userDataReader) }
+}
+
+internal class DistinctStage
+internal constructor(
+  private val groups: Array<out Selectable>,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<DistinctStage>("distinct", options) {
+  override fun self(options: InternalOptions) = DistinctStage(groups, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(encodeValue(groups.associate { it.getAlias() to it.toProto(userDataReader) }))
+}
+
+internal class RemoveFieldsStage
+internal constructor(
+  private val fields: Array<out Field>,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<RemoveFieldsStage>("remove_fields", options) {
+  override fun self(options: InternalOptions) = RemoveFieldsStage(fields, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    fields.asSequence().map(Field::toProto)
+}
+
+internal class ReplaceStage
+internal constructor(
+  private val mapValue: Expr,
+  private val mode: Mode,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<ReplaceStage>("replace", options) {
+  class Mode private constructor(internal val proto: Value) {
+    private constructor(protoString: String) : this(encodeValue(protoString))
+    companion object {
+      val FULL_REPLACE = Mode("full_replace")
+      val MERGE_PREFER_NEXT = Mode("merge_prefer_nest")
+      val MERGE_PREFER_PARENT = Mode("merge_prefer_parent")
+    }
+  }
+  override fun self(options: InternalOptions) = ReplaceStage(mapValue, mode, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(mapValue.toProto(userDataReader), mode.proto)
+}
+
+/**
+ * Performs a pseudo-random sampling of the input documents.
+ *
+ * The documents produced from this stage are non-deterministic, running the same query over the
+ * same dataset multiple times will produce different results. There are two different ways to
+ * dictate how the sample is calculated either by specifying a target output size, or by specifying
+ * a target percentage of the input size.
+ */
+class SampleStage
+private constructor(
+  private val size: Number,
+  private val mode: Mode,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<SampleStage>("sample", options) {
+  override fun self(options: InternalOptions) = SampleStage(size, mode, options)
+  class Mode private constructor(internal val proto: Value) {
+    private constructor(protoString: String) : this(encodeValue(protoString))
+    companion object {
+      val DOCUMENTS = Mode("documents")
+      val PERCENT = Mode("percent")
+    }
+  }
+  companion object {
+    /**
+     * Creates [SampleStage] with size limited to percentage of prior stages results.
+     *
+     * The [percentage] parameter is the target percentage (between 0.0 & 1.0) of the number of
+     * input documents to produce. Each input document is independently selected against the given
+     * percentage. As a result the output size will be approximately documents * [percentage].
+     *
+     * @param percentage The percentage of the prior stages documents to emit.
+     * @return [SampleStage] with specified [percentage].
+     */
+    @JvmStatic fun withPercentage(percentage: Double) = SampleStage(percentage, Mode.PERCENT)
+
+    /**
+     * Creates [SampleStage] with size limited to number of documents.
+     *
+     * The [documents] parameter represents the target number of documents to produce and must be a
+     * non-negative integer value. If the previous stage produces less than size documents, the
+     * entire previous results are returned. If the previous stage produces more than size, this
+     * outputs a sample of exactly size entries where any sample is equally likely.
+     *
+     * @param documents The number of documents to emit.
+     * @return [SampleStage] with specified [documents].
+     */
+    @JvmStatic fun withDocLimit(documents: Int) = SampleStage(documents, Mode.DOCUMENTS)
+  }
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(encodeValue(size), mode.proto)
+}
+
+internal class UnionStage
+internal constructor(
+  private val other: com.google.firebase.firestore.Pipeline,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<UnionStage>("union", options) {
+  override fun self(options: InternalOptions) = UnionStage(other, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(Value.newBuilder().setPipelineValue(other.toPipelineProto()).build())
+}
+
+/**
+ * Takes a specified array from the input documents and outputs a document for each element with the
+ * element stored in a field with name specified by the alias.
+ */
+class UnnestStage
+internal constructor(
+  private val selectable: Selectable,
+  options: InternalOptions = InternalOptions.EMPTY
+) : BaseStage<UnnestStage>("unnest", options) {
+  companion object {
+
+    /**
+     * Creates [UnnestStage] with input array and alias specified.
+     *
+     * For each document emitted by the prior stage, this stage will emit zero or more augmented
+     * documents. The input array is found in parameter [arrayWithAlias], which can be an [Expr]
+     * with an alias specified via [Expr.alias], or a [Field] that can also have alias specified.
+     * For each element of the input array, an augmented document will be produced. The element of
+     * input array will be stored in a field with name specified by the alias of the
+     * [arrayWithAlias] parameter. If the [arrayWithAlias] is a [Field] with no alias, then the
+     * original array field will be replaced with the individual element.
+     *
+     * @param arrayWithAlias The input array with field alias to store output element of array.
+     * @return [SampleStage] with input array and alias specified.
+     */
+    @JvmStatic fun withField(arrayWithAlias: Selectable) = UnnestStage(arrayWithAlias)
+
+    /**
+     * Creates [UnnestStage] with input array and alias specified.
+     *
+     * For each document emitted by the prior stage, this stage will emit zero or more augmented
+     * documents. The input array found in the previous stage document field specified by the
+     * [arrayField] parameter, will for each element of the input array produce an augmented
+     * document. The element of the input array will be stored in a field with name specified by
+     * [alias] parameter on the augmented document.
+     *
+     * @return [SampleStage] with input array and alias specified.
+     */
+    @JvmStatic
+    fun withField(arrayField: String, alias: String): UnnestStage =
+      UnnestStage(Expr.field(arrayField).alias(alias))
+  }
+  override fun self(options: InternalOptions) = UnnestStage(selectable, options)
+  override fun args(userDataReader: UserDataReader): Sequence<Value> =
+    sequenceOf(encodeValue(selectable.getAlias()), selectable.toProto(userDataReader))
+
+  /**
+   * Adds index field to emitted documents
+   *
+   * A field with name specified in [indexField] will be added to emitted document. The index is a
+   * numeric value that corresponds to array index of the element from input array.
+   *
+   * @param indexField The field name of index field.
+   * @return [SampleStage] that includes specified index field.
+   */
+  fun withIndexField(indexField: String): UnnestStage = with("index_field", indexField)
+}
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/remote/Datastore.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/remote/Datastore.java
index 87365361be4..e3a8da26217 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/remote/Datastore.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/remote/Datastore.java
@@ -21,8 +21,11 @@
 import androidx.annotation.VisibleForTesting;
 import com.google.android.gms.tasks.Task;
 import com.google.android.gms.tasks.TaskCompletionSource;
+import com.google.common.base.Strings;
+import com.google.firebase.Timestamp;
 import com.google.firebase.firestore.AggregateField;
 import com.google.firebase.firestore.FirebaseFirestoreException;
+import com.google.firebase.firestore.PipelineResultObserver;
 import com.google.firebase.firestore.core.Query;
 import com.google.firebase.firestore.model.DocumentKey;
 import com.google.firebase.firestore.model.MutableDocument;
@@ -34,6 +37,9 @@
 import com.google.firestore.v1.BatchGetDocumentsResponse;
 import com.google.firestore.v1.CommitRequest;
 import com.google.firestore.v1.CommitResponse;
+import com.google.firestore.v1.Document;
+import com.google.firestore.v1.ExecutePipelineRequest;
+import com.google.firestore.v1.ExecutePipelineResponse;
 import com.google.firestore.v1.FirestoreGrpc;
 import com.google.firestore.v1.RunAggregationQueryRequest;
 import com.google.firestore.v1.RunAggregationQueryResponse;
@@ -237,6 +243,48 @@ public Task<Map<String, Value>> runAggregateQuery(
             });
   }
 
+  public void executePipeline(ExecutePipelineRequest request, PipelineResultObserver observer) {
+    channel.runStreamingResponseRpc(
+        FirestoreGrpc.getExecutePipelineMethod(),
+        request,
+        new FirestoreChannel.StreamingListener<ExecutePipelineResponse>() {
+
+          private Timestamp executionTime = null;
+
+          @Override
+          public void onMessage(ExecutePipelineResponse message) {
+            if (message.hasExecutionTime()) {
+              executionTime = serializer.decodeTimestamp(message.getExecutionTime());
+            }
+            for (Document document : message.getResultsList()) {
+              String documentName = document.getName();
+              observer.onDocument(
+                  Strings.isNullOrEmpty(documentName) ? null : serializer.decodeKey(documentName),
+                  document.getFieldsMap(),
+                  document.hasCreateTime()
+                      ? serializer.decodeTimestamp(document.getCreateTime())
+                      : null,
+                  document.hasUpdateTime()
+                      ? serializer.decodeTimestamp(document.getUpdateTime())
+                      : null);
+            }
+          }
+
+          @Override
+          public void onClose(Status status) {
+            if (status.isOk()) {
+              observer.onComplete(executionTime);
+            } else {
+              FirebaseFirestoreException exception = exceptionFromStatus(status);
+              if (exception.getCode() == FirebaseFirestoreException.Code.UNAUTHENTICATED) {
+                channel.invalidateToken();
+              }
+              observer.onError(exception);
+            }
+          }
+        });
+  }
+
   /**
    * Determines whether the given status has an error code that represents a permanent error when
    * received in response to a non-write operation.
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/remote/RemoteSerializer.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/remote/RemoteSerializer.java
index 8e509247524..2e813ac3b98 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/remote/RemoteSerializer.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/remote/RemoteSerializer.java
@@ -727,31 +727,39 @@ StructuredQuery.Filter encodeFilter(com.google.firebase.firestore.core.Filter fi
 
   @VisibleForTesting
   StructuredQuery.Filter encodeUnaryOrFieldFilter(FieldFilter filter) {
-    if (filter.getOperator() == FieldFilter.Operator.EQUAL
-        || filter.getOperator() == FieldFilter.Operator.NOT_EQUAL) {
-      UnaryFilter.Builder unaryProto = UnaryFilter.newBuilder();
-      unaryProto.setField(encodeFieldPath(filter.getField()));
-      if (Values.isNanValue(filter.getValue())) {
-        unaryProto.setOp(
-            filter.getOperator() == FieldFilter.Operator.EQUAL
-                ? UnaryFilter.Operator.IS_NAN
-                : UnaryFilter.Operator.IS_NOT_NAN);
-        return StructuredQuery.Filter.newBuilder().setUnaryFilter(unaryProto).build();
-      } else if (Values.isNullValue(filter.getValue())) {
-        unaryProto.setOp(
-            filter.getOperator() == FieldFilter.Operator.EQUAL
-                ? UnaryFilter.Operator.IS_NULL
-                : UnaryFilter.Operator.IS_NOT_NULL);
-        return StructuredQuery.Filter.newBuilder().setUnaryFilter(unaryProto).build();
+    FieldFilter.Operator op = filter.getOperator();
+    Value value = filter.getValue();
+    FieldReference fieldReference = encodeFieldPath(filter.getField());
+    if (op == FieldFilter.Operator.EQUAL) {
+      if (Values.isNanValue(value)) {
+        return encodeUnaryFilter(fieldReference, UnaryFilter.Operator.IS_NAN);
+      }
+      if (Values.isNullValue(value)) {
+        return encodeUnaryFilter(fieldReference, UnaryFilter.Operator.IS_NULL);
+      }
+    } else if (op == FieldFilter.Operator.NOT_EQUAL) {
+      if (Values.isNanValue(value)) {
+        return encodeUnaryFilter(fieldReference, UnaryFilter.Operator.IS_NOT_NAN);
+      }
+      if (Values.isNullValue(value)) {
+        return encodeUnaryFilter(fieldReference, UnaryFilter.Operator.IS_NOT_NULL);
       }
     }
     StructuredQuery.FieldFilter.Builder proto = StructuredQuery.FieldFilter.newBuilder();
-    proto.setField(encodeFieldPath(filter.getField()));
-    proto.setOp(encodeFieldFilterOperator(filter.getOperator()));
-    proto.setValue(filter.getValue());
+    proto.setField(fieldReference);
+    proto.setOp(encodeFieldFilterOperator(op));
+    proto.setValue(value);
     return StructuredQuery.Filter.newBuilder().setFieldFilter(proto).build();
   }
 
+  private StructuredQuery.Filter encodeUnaryFilter(
+      FieldReference fieldReference, UnaryFilter.Operator op) {
+    UnaryFilter.Builder unaryProto = UnaryFilter.newBuilder();
+    unaryProto.setField(fieldReference);
+    unaryProto.setOp(op);
+    return StructuredQuery.Filter.newBuilder().setUnaryFilter(unaryProto).build();
+  }
+
   StructuredQuery.CompositeFilter.Operator encodeCompositeFilterOperator(
       com.google.firebase.firestore.core.CompositeFilter.Operator op) {
     switch (op) {
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/remote/RemoteStore.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/remote/RemoteStore.java
index d2a139d4b6f..05f2bfa9837 100644
--- a/firebase-firestore/src/main/java/com/google/firebase/firestore/remote/RemoteStore.java
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/remote/RemoteStore.java
@@ -23,6 +23,7 @@
 import com.google.firebase.database.collection.ImmutableSortedSet;
 import com.google.firebase.firestore.AggregateField;
 import com.google.firebase.firestore.FirebaseFirestoreException;
+import com.google.firebase.firestore.PipelineResultObserver;
 import com.google.firebase.firestore.core.OnlineState;
 import com.google.firebase.firestore.core.Query;
 import com.google.firebase.firestore.core.Transaction;
@@ -43,6 +44,7 @@
 import com.google.firebase.firestore.util.AsyncQueue;
 import com.google.firebase.firestore.util.Logger;
 import com.google.firebase.firestore.util.Util;
+import com.google.firestore.v1.ExecutePipelineRequest;
 import com.google.firestore.v1.Value;
 import com.google.protobuf.ByteString;
 import io.grpc.Status;
@@ -777,4 +779,14 @@ public Task<Map<String, Value>> runAggregateQuery(
               "Failed to get result from server.", FirebaseFirestoreException.Code.UNAVAILABLE));
     }
   }
+
+  public void executePipeline(ExecutePipelineRequest request, PipelineResultObserver observer) {
+    if (canUseNetwork()) {
+      datastore.executePipeline(request, observer);
+    } else {
+      observer.onError(
+          new FirebaseFirestoreException(
+              "Failed to get result from server.", FirebaseFirestoreException.Code.UNAVAILABLE));
+    }
+  }
 }
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/util/BiFunction.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/util/BiFunction.java
new file mode 100644
index 00000000000..1afb87fbb1d
--- /dev/null
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/util/BiFunction.java
@@ -0,0 +1,7 @@
+package com.google.firebase.firestore.util;
+
+/** A port of {@link java.util.function.BiFunction} */
+@FunctionalInterface
+public interface BiFunction<T, U, R> {
+  R apply(T t, U u);
+}
diff --git a/firebase-firestore/src/main/java/com/google/firebase/firestore/util/IntFunction.java b/firebase-firestore/src/main/java/com/google/firebase/firestore/util/IntFunction.java
new file mode 100644
index 00000000000..2407db54808
--- /dev/null
+++ b/firebase-firestore/src/main/java/com/google/firebase/firestore/util/IntFunction.java
@@ -0,0 +1,7 @@
+package com.google.firebase.firestore.util;
+
+/** A port of {@link java.util.function.IntFunction} */
+@FunctionalInterface
+public interface IntFunction<R> {
+  R apply(int value);
+}
diff --git a/firebase-firestore/src/proto/google/firestore/v1/document.proto b/firebase-firestore/src/proto/google/firestore/v1/document.proto
index 52dc85ca9df..9947a289a1e 100644
--- a/firebase-firestore/src/proto/google/firestore/v1/document.proto
+++ b/firebase-firestore/src/proto/google/firestore/v1/document.proto
@@ -129,6 +129,50 @@ message Value {
 
     // A map value.
     MapValue map_value = 6;
+
+
+    // Value which references a field.
+    //
+    // This is considered relative (vs absolute) since it only refers to a field
+    // and not a field within a particular document.
+    //
+    // **Requires:**
+    //
+    // * Must follow [field reference][FieldReference.field_path] limitations.
+    //
+    // * Not allowed to be used when writing documents.
+    //
+    // (-- NOTE(batchik): long term, there is no reason this type should not be
+    //     allowed to be used on the write path. --)
+    string field_reference_value = 19;
+
+    // A value that represents an unevaluated expression.
+    //
+    // **Requires:**
+    //
+    // * Not allowed to be used when writing documents.
+    //
+    // (-- NOTE(batchik): similar to above, there is no reason to not allow
+    //     storing expressions into the database, just no plan to support in
+    //     the near term.
+    //
+    //     This would actually be an interesting way to represent user-defined
+    //     functions or more expressive rules-based systems. --)
+    Function function_value = 20;
+
+    // A value that represents an unevaluated pipeline.
+    //
+    // **Requires:**
+    //
+    // * Not allowed to be used when writing documents.
+    //
+    // (-- NOTE(batchik): similar to above, there is no reason to not allow
+    //     storing expressions into the database, just no plan to support in
+    //     the near term.
+    //
+    //     This would actually be an interesting way to represent user-defined
+    //     functions or more expressive rules-based systems. --)
+    Pipeline pipeline_value = 21;
   }
 }
 
@@ -148,3 +192,73 @@ message MapValue {
   // not exceed 1,500 bytes and cannot be empty.
   map<string, Value> fields = 1;
 }
+
+// Represents an unevaluated scalar expression.
+//
+// For example, the expression `like(user_name, "%alice%")` is represented as:
+//
+// ```
+// name: "like"
+// args { field_reference: "user_name" }
+// args { string_value: "%alice%" }
+// ```
+//
+// (-- api-linter: core::0123::resource-annotation=disabled
+//     aip.dev/not-precedent: this is not a One Platform API resource. --)
+message Function {
+  // The name of the function to evaluate.
+  //
+  // **Requires:**
+  //
+  // * must be in snake case (lower case with underscore separator).
+  //
+  string name = 1;
+
+  // Ordered list of arguments the given function expects.
+  repeated Value args = 2;
+
+  // Optional named arguments that certain functions may support.
+  map<string, Value> options = 3;
+}
+
+// A Firestore query represented as an ordered list of operations / stages.
+message Pipeline {
+  // A single operation within a pipeline.
+  //
+  // A stage is made up of a unique name, and a list of arguments. The exact
+  // number of arguments & types is dependent on the stage type.
+  //
+  // To give an example, the stage `filter(state = "MD")` would be encoded as:
+  //
+  // ```
+  // name: "filter"
+  // args {
+  //   function_value {
+  //     name: "eq"
+  //     args { field_reference_value: "state" }
+  //     args { string_value: "MD" }
+  //   }
+  // }
+  // ```
+  //
+  // See public documentation for the full list.
+  message Stage {
+    // The name of the stage to evaluate.
+    //
+    // **Requires:**
+    //
+    // * must be in snake case (lower case with underscore separator).
+    //
+    string name = 1;
+
+    // Ordered list of arguments the given stage expects.
+    repeated Value args = 2;
+
+    // Optional named arguments that certain functions may support.
+    map<string, Value> options = 3;
+  }
+
+  // Ordered list of stages to evaluate.
+  repeated Stage stages = 1;
+}
+
diff --git a/firebase-firestore/src/proto/google/firestore/v1/firestore.proto b/firebase-firestore/src/proto/google/firestore/v1/firestore.proto
index 9ea56429afc..d59c9e2decb 100644
--- a/firebase-firestore/src/proto/google/firestore/v1/firestore.proto
+++ b/firebase-firestore/src/proto/google/firestore/v1/firestore.proto
@@ -22,6 +22,7 @@ import "google/api/field_behavior.proto";
 import "google/firestore/v1/aggregation_result.proto";
 import "google/firestore/v1/common.proto";
 import "google/firestore/v1/document.proto";
+import "google/firestore/v1/pipeline.proto";
 import "google/firestore/v1/query.proto";
 import "google/firestore/v1/write.proto";
 import "google/protobuf/empty.proto";
@@ -139,6 +140,15 @@ service Firestore {
     };
   }
 
+  // Executes a pipeline query.
+  rpc ExecutePipeline(ExecutePipelineRequest)
+      returns (stream ExecutePipelineResponse) {
+    option (google.api.http) = {
+      post: "/v1beta1/{database=projects/*/databases/*}:executePipeline"
+      body: "*"
+    };
+  }
+
   // Runs an aggregation query.
   //
   // Rather than producing [Document][google.firestore.v1.Document] results like
@@ -574,6 +584,80 @@ message RunQueryResponse {
   int32 skipped_results = 4;
 }
 
+// The request for [Firestore.ExecutePipeline][].
+message ExecutePipelineRequest {
+  // Database identifier, in the form `projects/{project}/databases/{database}`.
+  string database = 1;
+
+  oneof pipeline_type {
+    // A pipelined operation.
+    StructuredPipeline structured_pipeline = 2;
+  }
+
+  // Optional consistency arguments, defaults to strong consistency.
+  oneof consistency_selector {
+    // Run the query within an already active transaction.
+    //
+    // The value here is the opaque transaction ID to execute the query in.
+    bytes transaction = 5;
+
+    // Execute the pipeline in a new transaction.
+    //
+    // The identifier of the newly created transaction will be returned in the
+    // first response on the stream. This defaults to a read-only transaction.
+    TransactionOptions new_transaction = 6;
+
+    // Execute the pipeline in a snapshot transaction at the given time.
+    //
+    // This must be a microsecond precision timestamp within the past one hour,
+    // or if Point-in-Time Recovery is enabled, can additionally be a whole
+    // minute timestamp within the past 7 days.
+    google.protobuf.Timestamp read_time = 7;
+  }
+
+  // Explain / analyze options for the pipeline.
+  // ExplainOptions explain_options = 8 [(google.api.field_behavior) = OPTIONAL];
+}
+
+// The response for [Firestore.Execute][].
+message ExecutePipelineResponse {
+  // Newly created transaction identifier.
+  //
+  // This field is only specified on the first response from the server when
+  // the request specified [ExecuteRequest.new_transaction][].
+  bytes transaction = 1;
+
+  // An ordered batch of results returned executing a pipeline.
+  //
+  // The batch size is variable, and can even be zero for when only a partial
+  // progress message is returned.
+  //
+  // The fields present in the returned documents are only those that were
+  // explicitly requested in the pipeline, this include those like
+  // [`__name__`][Document.name] & [`__update_time__`][Document.update_time].
+  // This is explicitly a divergence from `Firestore.RunQuery` /
+  // `Firestore.GetDocument` RPCs which always return such fields even when they
+  // are not specified in the [`mask`][DocumentMask].
+  repeated Document results = 2;
+
+  // The time at which the document(s) were read.
+  //
+  // This may be monotonically increasing; in this case, the previous documents
+  // in the result stream are guaranteed not to have changed between their
+  // `execution_time` and this one.
+  //
+  // If the query returns no results, a response with `execution_time` and no
+  // `results` will be sent, and this represents the time at which the operation
+  // was run.
+  google.protobuf.Timestamp execution_time = 3;
+
+  // Query explain metrics.
+  //
+  // Set on the last response when [ExecutePipelineRequest.explain_options][]
+  // was specified on the request.
+  // ExplainMetrics explain_metrics = 4;
+}
+
 // The request for [Firestore.RunAggregationQuery][google.firestore.v1.Firestore.RunAggregationQuery].
 message RunAggregationQueryRequest {
   // Required. The parent resource name. In the format:
diff --git a/firebase-firestore/src/proto/google/firestore/v1/pipeline.proto b/firebase-firestore/src/proto/google/firestore/v1/pipeline.proto
new file mode 100644
index 00000000000..f425ec6911a
--- /dev/null
+++ b/firebase-firestore/src/proto/google/firestore/v1/pipeline.proto
@@ -0,0 +1,40 @@
+// Copyright 2024 Google LLC.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+package google.firestore.v1;
+import "google/firestore/v1/document.proto";
+option csharp_namespace = "Google.Cloud.Firestore.V1";
+option php_namespace = "Google\\Cloud\\Firestore\\V1";
+option ruby_package = "Google::Cloud::Firestore::V1";
+option java_multiple_files = true;
+option java_package = "com.google.firestore.v1";
+option java_outer_classname = "PipelineProto";
+option objc_class_prefix = "GCFS";
+// A Firestore query represented as an ordered list of operations / stages.
+//
+// This is considered the top-level function which plans & executes a query.
+// It is logically equivalent to `query(stages, options)`, but prevents the
+// client from having to build a function wrapper.
+message StructuredPipeline {
+  // The pipeline query to execute.
+  Pipeline pipeline = 1;
+  // Optional query-level arguments.
+  //
+  // (-- Think query statement hints. --)
+  //
+  // (-- TODO(batchik): define the api contract of using an unsupported hint --)
+  map<string, Value> options = 2;
+}
+
diff --git a/firebase-firestore/src/testUtil/java/com/google/firebase/firestore/TestAccessHelper.java b/firebase-firestore/src/testUtil/java/com/google/firebase/firestore/TestAccessHelper.java
index bab88979493..b62ec1b9933 100644
--- a/firebase-firestore/src/testUtil/java/com/google/firebase/firestore/TestAccessHelper.java
+++ b/firebase-firestore/src/testUtil/java/com/google/firebase/firestore/TestAccessHelper.java
@@ -14,14 +14,20 @@
 
 package com.google.firebase.firestore;
 
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import com.google.firebase.firestore.model.DatabaseId;
 import com.google.firebase.firestore.model.DocumentKey;
 
 public final class TestAccessHelper {
 
   /** Makes the DocumentReference constructor accessible. */
   public static DocumentReference createDocumentReference(DocumentKey documentKey) {
-    // We can use null here because the tests only use this as a wrapper for documentKeys.
-    return new DocumentReference(documentKey, null);
+    // We can use mock here because the tests only use this as a wrapper for documentKeys.
+    FirebaseFirestore mock = mock(FirebaseFirestore.class);
+    when(mock.getDatabaseId()).thenReturn(DatabaseId.forProject("project"));
+    return new DocumentReference(documentKey, mock);
   }
 
   /** Makes the getKey() method accessible. */