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https://issues.apache.org/jira/browse/SPARK-38886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17521535#comment-17521535
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Apache Spark commented on SPARK-38886:
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User 'ulysses-you' has created a pull request for this issue:
https://github.com/apache/spark/pull/36177
> Remove outer join if aggregate functions are duplicate agnostic on streamed
> side
> --------------------------------------------------------------------------------
>
> Key: SPARK-38886
> URL: https://issues.apache.org/jira/browse/SPARK-38886
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: XiDuo You
> Priority: Major
>
> If aggregate child is outer join, and the aggregate references are all coming
> from the streamed side and the aggregate functions are all duplicate
> agnostic, we can remve the outer join.
> For example:
> {code:java}
> SELECT t1.c1, min(t1.c2) FROM t1 LEFT JOIN t2 ON t1.c1 = t2.c1 GROUP BY t1.c1
> ==>
> SELECT t1.c1, min(t1.c2) FROM t1 GROUP BY t1.c1
> {code}
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