andygrove opened a new pull request, #6511:
URL: https://github.com/apache/datafusion-comet/pull/6511

   ## Which issue does this PR close?
   
   Closes #6505 on `branch-1.1`, for 1.1.0-rc2.
   
   ## Rationale for this change
   
   This is the `branch-1.1` backport of #6510. #5237 made the native Parquet 
scan fill in `_metadata.file_block_start` and `_metadata.file_block_length`, 
and when Spark splits a file, DataFusion and Spark's parquet-mr reader assign 
row groups to splits differently, so rows can report the wrong split's values. 
1.0.0 fell back to Spark for these columns. #6510 has the details.
   
   ## What changes are included in this PR?
   
   A clean cherry-pick (`-x`) of #6510's commit. A scan that reads either block 
column falls back to Spark, and the other `_metadata` columns stay native.
   
   ## How are these changes tested?
   
   On this branch, the `_metadata` tests in `ParquetReadV1Suite`, including the 
new one, and `CometScanRuleSuite` pass on the Spark 4.1 profile, 15 tests.
   


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