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https://issues.apache.org/jira/browse/SPARK-59981?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun reassigned SPARK-59981:
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Assignee: Peter Toth
> Derive the partition-key ordering when a V2 scan's reported ordering keeps no
> sort order
> ----------------------------------------------------------------------------------------
>
> Key: SPARK-59981
> URL: https://issues.apache.org/jira/browse/SPARK-59981
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 4.4.0
> Reporter: Peter Toth
> Assignee: Peter Toth
> Priority: Major
> Labels: pull-request-available
>
> A V2 scan that reports a {{KeyedPartitioning}} gets an ordering over its
> partition key expressions (SPARK-56241), since all rows of a partition have
> the same key. It gets it when it reports no ordering, or when Spark ignores
> its report (SPARK-59721). It does not get it when it reports an empty
> ordering, or one Spark keeps nothing of:
> * a report that starts with a column pruned from the scan output
> (SPARK-59899) and has no later sort order on a partition key other than a
> transform;
> * a report that starts with a partition transform (SPARK-59995) and has no
> later sort order on a partition key other than a transform.
> The ordering over the partition keys follows from the partitioning, not from
> the report. So it can be derived in these cases too. A sort-merge join, a
> window or a sort aggregate on the partition keys then needs no sort above the
> scan.
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