[fix](be) Fix missing decimal precision and scale for legacy decimal data#65419
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[fix](be) Fix missing decimal precision and scale for legacy decimal data#65419jacktengg wants to merge 2 commits into
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jacktengg
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/review |
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yiguolei
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| void fill_missing_decimal_precision(ColumnMetaPB* meta, const TabletColumn& column) { |
yiguolei
reviewed
Jul 9, 2026
| // Segments written before #26572 do not persist decimal precision/frac in | ||
| // ColumnMetaPB, so recover the logical p/s from TabletSchema before | ||
| // ColumnReader builds DataTypeDecimal. | ||
| fill_missing_decimal_precision_from_schema(&meta, _tablet_schema); |
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如果你再这里修改了，那么上次的fix 还有用没？
另外，这里好像没区分decimalv2还是decimal v3？ 比如如果是decimal v2 怎么办？
yiguolei
reviewed
Jul 9, 2026
| } | ||
| } | ||
| } else if (is_numeric_type(type)) { | ||
| } else if (field_is_numeric_type(type)) { |
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删除重复代码is_numeric_type。
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Jul 9, 2026
| // Segments written before #26572 do not persist decimal precision/frac in | ||
| // ColumnMetaPB, so recover the logical p/s from TabletSchema before | ||
| // ColumnReader builds DataTypeDecimal. | ||
| fill_missing_decimal_precision_from_schema(&meta, _tablet_schema); |
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在Segment::_parse_footer 的时候把里面的ColumnMetaPB 改了就行。
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BE Regression && UT Coverage ReportIncrement line coverage Increment coverage report
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…data Related PR: apache#26572, apache#63569 Problem Summary: Segments written before decimal ColumnMetaPB precision and scale were persisted can miss decimal precision and scale in metadata. Regular columns, complex decimal children may then build decimal DataType instances without the logical precision/scale from TabletSchema. This change centralizes decimal metadata recovery from TabletSchema, applies it before ColumnReader/DataType creation. Fix legacy segment footer parsing to recover missing decimal precision and scale before column readers and data types are created.
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TPC-H: Total hot run time: 29976 ms |
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TPC-DS: Total hot run time: 180810 ms |
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ClickBench: Total hot run time: 24.88 s |
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Jul 10, 2026
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PR approved by at least one committer and no changes requested. |
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PR approved by anyone and no changes requested. |
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TPC-H: Total hot run time: 29625 ms |
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TPC-DS: Total hot run time: 179789 ms |
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ClickBench: Total hot run time: 25.06 s |
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What problem does this PR solve?
Issue Number: close #xxx
Related PR: #26572, #63569
Problem Summary:
Segments written before decimal ColumnMetaPB precision and scale were persisted can miss precision and scale for decimal types in metadata . Regular columns, complex decimal children may then build decimal DataType instances without the logical precision/scale from TabletSchema, and result in error "Wrong precision 0, min: 1, max: 76". This change centralizes decimal metadata recovery from TabletSchema, applies it before ColumnReader/DataType creation.
Release note
Fix reading legacy decimal whose segment metadata is missing decimal precision and scale.
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Test
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