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https://issues.apache.org/jira/browse/SPARK-37455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17448879#comment-17448879
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Apache Spark commented on SPARK-37455:
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User 'c21' has created a pull request for this issue:
https://github.com/apache/spark/pull/34702
> Replace hash with sort aggregate if child is already sorted
> -----------------------------------------------------------
>
> Key: SPARK-37455
> URL: https://issues.apache.org/jira/browse/SPARK-37455
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 3.3.0
> Reporter: Cheng Su
> Priority: Minor
>
> In the query plan, if the child of hash aggregate is already sorted on
> group-by columns, we can replace hash aggregate with sort aggregate for
> better performance, as sort aggregate does not have hashing overhead of hash
> aggregate.
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