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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/11/24 23:46:00 UTC

[jira] [Commented] (SPARK-37455) Replace hash with sort aggregate if child is already sorted

    [ https://issues.apache.org/jira/browse/SPARK-37455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17448879#comment-17448879 ] 

Apache Spark commented on SPARK-37455:
--------------------------------------

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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