[jira] [Commented] (SPARK-39172) Remove outer join if all output come from streamed side and buffered side keys exist unique key

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

    [ https://issues.apache.org/jira/browse/SPARK-39172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17536428#comment-17536428 ] 

Apache Spark commented on SPARK-39172:
--------------------------------------

User 'ulysses-you' has created a pull request for this issue:
https://github.com/apache/spark/pull/36530

> Remove outer join if all output come from streamed side and buffered side keys exist unique key
> -----------------------------------------------------------------------------------------------
>
>                 Key: SPARK-39172
>                 URL: https://issues.apache.org/jira/browse/SPARK-39172
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 3.4.0
>            Reporter: XiDuo You
>            Priority: Major
>
> Improve the optimzation case using the distinct keys framework.
> For example:
> {code:java}
> SELECT t1.* FROM t1 LEFT JOIN (SELECT distinct c1 as c1 FROM t)t2 ON t1.c1 = t2.c1
> ==>
> SELECT t1.* FROM t1 {code}



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