[ https://issues.apache.org/jira/browse/SPARK-41471 ]
Mars deleted comment on SPARK-41471:
------------------------------
was (Author: JIRAUSER290821):
[~csun] Hi, I want to take it :)
> 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
>
> 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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