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https://issues.apache.org/jira/browse/SPARK-41471?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chao Sun resolved SPARK-41471.
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Fix Version/s: 4.0.0
Resolution: Fixed
Issue resolved by pull request 42194
[https://github.com/apache/spark/pull/42194]
> SPJ: Reduce Spark shuffle when only one side of a join is
> KeyGroupedPartitioning
> --------------------------------------------------------------------------------
>
> Key: SPARK-41471
> URL: https://issues.apache.org/jira/browse/SPARK-41471
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.3.1
> Reporter: Chao Sun
> Priority: Major
> Fix For: 4.0.0
>
>
> When only one side of a SPJ (Storage-Partitioned Join) is
> {{{}KeyGroupedPartitioning{}}}, Spark currently needs to shuffle both sides
> using {{{}HashPartitioning{}}}. However, we may just need to shuffle the
> other side according to the partition transforms defined in
> {{{}KeyGroupedPartitioning{}}}. This is especially useful when the other side
> is relatively small.
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