[jira] [Created] (SPARK-41471) SPJ: reduce Spark shuffle when only one side of a join is KeyGroupedPartitioning

["Chao Sun (Jira)" <ji...@apache.org>]

Chao Sun created SPARK-41471:
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             Summary: 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


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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