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https://issues.apache.org/jira/browse/SPARK-31943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jefferson V updated SPARK-31943:
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Labels: backward-incompatible (was: )
> SPARK-31500 introduces breaking changes in 2.4.6
> ------------------------------------------------
>
> Key: SPARK-31943
> URL: https://issues.apache.org/jira/browse/SPARK-31943
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.6
> Reporter: Jefferson V
> Priority: Major
> Labels: backward-incompatible
>
> [31500|[https://github.com/apache/spark/pull/28351/files]] introduced
> unimplemented fields of the `Collect` class that cause extensions of that
> class to fail unless the spark version is pinned to `2.4.5`. Since this was a
> minor version bump, seems like this wasn't desired.
> I believe we should be able to at least put default values:
> `convertToBufferElement(value: Any): Any = InternalRow.copyValue(value)`
> `bufferElementType: DataType = child.dataType`
> and restore the `override def eval` in `Collect`, to support compatibility
> with 2.4.5 while allowing implementers in that file to override them to fix
> the bug. Since the abstract `Collect` is currently not designed to fix the
> bug (just provide tools that can be implemented to fix it), this change
> wouldn't undermine the bug fix, just add backwards compatibility to 2.4.5.
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