fix: Bucketed scan fallback for native_datafusion Parquet scan

[mbutrovich]

Which issue does this PR close?

Closes #.

Rationale for this change

See #1719

What changes are included in this PR?

Fallback for bucketed scan when using native_datafusion.

How are these changes tested?

Existing Spark SQL tests.

[parthchandra]

While this is ok to pass tests what we need is for CometNativeScanExec to implement support for bucketing like here https://github.com/apache/spark/blob/bc013c031b6b3e0c34cab6f9dc2ba6b85f5edab9/sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala#L722

[andygrove]

Thanks @mbutrovich

[parthchandra]

While this is ok to pass tests what we need is for CometNativeScanExec to implement support for bucketing like here https://github.com/apache/spark/blob/bc013c031b6b3e0c34cab6f9dc2ba6b85f5edab9/sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala#L722

You already said so in #1719. :)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 44.44444% with 5 lines in your changes missing coverage. Please review.

Project coverage is 58.63%. Comparing base (f09f8af) to head (564b5fa).
Report is 181 commits behind head on main.

Files with missing lines	Patch %	Lines
...n/scala/org/apache/comet/rules/CometScanRule.scala	44.44%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1720      +/-   ##
============================================
+ Coverage     56.12%   58.63%   +2.50%     
- Complexity      976     1143     +167     
============================================
  Files           119      129      +10     
  Lines         11743    12644     +901     
  Branches       2251     2364     +113     
============================================
+ Hits           6591     7414     +823     
- Misses         4012     4052      +40     
- Partials       1140     1178      +38     

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[mbutrovich]

Interestingly, we were passing the Comet test of bucketed scan before:

https://github.com/apache/datafusion-comet/actions/runs/14893567863/job/41846178932?pr=1720#step:6:3558

I suspect the issue shows up when buckets are pruned at planning time, which this test might not exercise.