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https://issues.apache.org/jira/browse/SPARK-42716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17697845#comment-17697845
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Apache Spark commented on SPARK-42716:
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User 'EnricoMi' has created a pull request for this issue:
https://github.com/apache/spark/pull/40334
> DataSourceV2 cannot report KeyGroupedPartitioning with multiple keys per
> partition
> ----------------------------------------------------------------------------------
>
> Key: SPARK-42716
> URL: https://issues.apache.org/jira/browse/SPARK-42716
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.3.0, 3.3.1, 3.3.2, 3.4.0, 3.4.1
> Reporter: Enrico Minack
> Priority: Major
>
> From Spark 3.0.0 until 3.2.3, a DataSourceV2 could report its partitioning as
> {{KeyGroupedPartitioning}} via {{SupportsReportPartitioning}}, even if
> multiple keys belong to a partition.
> With SPARK-37377, only if all partitions implement {{HasPartitionKey}}, the
> partition information reported through {{SupportsReportPartitioning}} is
> considered by catalyst. But this limits the number of keys per partition to 1.
> Spark should continue to support the more general situation of
> {{KeyGroupedPartitioning}} with multiple keys per partition, like
> {{HashPartitioning}}.
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