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https://issues.apache.org/jira/browse/SPARK-38832?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17519548#comment-17519548
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Apache Spark commented on SPARK-38832:
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User 'ulysses-you' has created a pull request for this issue:
https://github.com/apache/spark/pull/36117
> Remove unnecessary distinct in aggregate expression by distinctKeys
> -------------------------------------------------------------------
>
> Key: SPARK-38832
> URL: https://issues.apache.org/jira/browse/SPARK-38832
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.4.0
> Reporter: XiDuo You
> Priority: Major
>
> We can remove the distinct in aggregate expression if the child distinct
> semantics is guaranteed.
> For example:
> {code:java}
> SELECT count(distinct c) FROM (
> SELECT c FROM t GROUP BY c
> ){code}
>
>
>
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