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Posted to issues@spark.apache.org by "Juliusz Sompolski (Jira)" <ji...@apache.org> on 2022/10/26 11:47:00 UTC

[jira] [Created] (SPARK-40918) Mismatch between ParquetFileFormat and FileSourceScanExec in # columns for WSCG.isTooManyFields when using _metadata

Juliusz Sompolski created SPARK-40918:
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             Summary: Mismatch between ParquetFileFormat and FileSourceScanExec in # columns for WSCG.isTooManyFields when using _metadata
                 Key: SPARK-40918
                 URL: https://issues.apache.org/jira/browse/SPARK-40918
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 3.3.0
            Reporter: Juliusz Sompolski


_metadata.columns are taken into account in FileSourceScanExec.supportColumnar, but not when the parquet reader is created. This can result in Parquet reader outputting columnar (because it has less columns than WSCG.isTooManyFields), whereas FileSourceScanExec wants row output (because with the extra metadata columns it hits the isTooManyFields limit).

I have a fix forthcoming.



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