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https://issues.apache.org/jira/browse/SPARK-33964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17257498#comment-17257498
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Apache Spark commented on SPARK-33964:
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User 'tanelk' has created a pull request for this issue:
https://github.com/apache/spark/pull/30996
> Combine distinct unions in more cases
> -------------------------------------
>
> Key: SPARK-33964
> URL: https://issues.apache.org/jira/browse/SPARK-33964
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Tanel Kiis
> Priority: Major
>
> In several TPCDS queries the CombineUnions rule does not manage to combine
> unions, because they have noop Projects between them.
> The Projects will be removed by RemoveNoopOperators, but by then
> ReplaceDistinctWithAggregate has been applied and there are aggregates
> between the unions.
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