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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