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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2022/04/13 12:42:00 UTC
[jira] [Assigned] (SPARK-38887) Support switch inner join side for sort merge join
[ https://issues.apache.org/jira/browse/SPARK-38887?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Apache Spark reassigned SPARK-38887:
------------------------------------
Assignee: Apache Spark
> 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
> Assignee: Apache Spark
> 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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