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Posted to issues@spark.apache.org by "Dongjoon Hyun (Jira)" <ji...@apache.org> on 2022/01/27 19:58:00 UTC
[jira] [Commented] (SPARK-37193) DynamicJoinSelection.shouldDemoteBroadcastHashJoin should not apply to outer joins
[ https://issues.apache.org/jira/browse/SPARK-37193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17483408#comment-17483408 ]
Dongjoon Hyun commented on SPARK-37193:
---------------------------------------
I removed the `Fix Version` because this is reverted.
> DynamicJoinSelection.shouldDemoteBroadcastHashJoin should not apply to outer joins
> ----------------------------------------------------------------------------------
>
> Key: SPARK-37193
> URL: https://issues.apache.org/jira/browse/SPARK-37193
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.1.1
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
> Priority: Major
>
> {{DynamicJoinSelection.shouldDemoteBroadcastHashJoin}} will prevent AQE from converting Sort merge join into a broadcast join because SMJ is faster when the side that would be broadcast has a lot of empty partitions.
> This makes sense for inner joins which can short circuit if one side is empty.
> For (left,right) outer join, the streaming side still has to be processed so demoting broadcast join doesn't have the same advantage.
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