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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2022/10/26 12:50:00 UTC

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

     [ https://issues.apache.org/jira/browse/SPARK-40918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-40918:
------------------------------------

    Assignee: Apache Spark

> 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
>            Assignee: Apache Spark
>            Priority: Major
>
> _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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