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https://issues.apache.org/jira/browse/SPARK-38887?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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XiDuo You updated SPARK-38887:
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Summary: Support switch inner join side for sort merge join (was: Support
swtich inner join side for sort merge join)
> Support switch inner join side for sort merge join
> --------------------------------------------------
>
> Key: SPARK-38887
> URL: https://issues.apache.org/jira/browse/SPARK-38887
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: XiDuo You
> Priority: Major
>
> For an inner join type SortMergeJoin, it always uses the left side as
> streamed side and right side as buffered side.
> Accoirding to the implementaion of SortMergeJoin, we expect the buffered side
> to be:
> * smaller than streamed side
> * has less duplicate data
> We do not know whether the join will be SortMergeJoin at logical phase, so it
> should do this selection at physcial phase.
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