[jira] [Commented] (SPARK-38886) Remove outer join if aggregate functions are duplicate agnostic on streamed side

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-38886?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17521536#comment-17521536 ] 

Apache Spark commented on SPARK-38886:
--------------------------------------

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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