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