[jira] [Assigned] (SPARK-42716) DataSourceV2 cannot report KeyGroupedPartitioning with multiple keys per partition

["Apache Spark (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-42716?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-42716:
------------------------------------

    Assignee:     (was: Apache Spark)

> 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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