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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