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https://issues.apache.org/jira/browse/SPARK-33122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17212661#comment-17212661
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Apache Spark commented on SPARK-33122:
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User 'tanelk' has created a pull request for this issue:
https://github.com/apache/spark/pull/30018
> Remove redundant aggregates in the Optimzier
> --------------------------------------------
>
> Key: SPARK-33122
> URL: https://issues.apache.org/jira/browse/SPARK-33122
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.0.1
> Reporter: Tanel Kiis
> Priority: Major
>
> It is possible to have two or more consecutive aggregates whose sole purpose
> is to keep only distinct values (for example TPCDS q87). We can remove all
> but the last one do improve performance.
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