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

["Enrico Minack (Jira)" <ji...@apache.org>]

Enrico Minack created SPARK-42716:
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             Summary: 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: 3.3.2, 3.3.1, 3.3.0, 3.4.0, 3.4.1
            Reporter: Enrico Minack


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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