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https://issues.apache.org/jira/browse/SPARK-40918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan reassigned SPARK-40918:
-----------------------------------
Assignee: Juliusz Sompolski
> 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: Juliusz Sompolski
> 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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