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https://issues.apache.org/jira/browse/SPARK-32299?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean R. Owen updated SPARK-32299:
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Fix Version/s: (was: 3.1.0)
Target Version/s: (was: 3.1.0)
> Decide SMJ Join Orientation adaptively
> --------------------------------------
>
> Key: SPARK-32299
> URL: https://issues.apache.org/jira/browse/SPARK-32299
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.0
> Reporter: Mayur Bhosale
> Priority: Minor
>
> For SortMerge join of type EquiJoin, the left and right side of the joins are
> decided on the basis of the user order. In SMJ, the left side of the join is
> streamed and the right side is buffered (matching values). Because of this, B
> SMJ A would perform better than A SMJ B if, sizeOf(B) > sizeOf(A)
>
> With adaptive query execution, once both ShuffleQueryStages corresponding to
> the join have completed and if none of them have sizes lesser than the
> broadcast threshold, join orientation can be changed at run time.
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