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Posted to issues@spark.apache.org by "Cheng Su (Jira)" <ji...@apache.org> on 2021/11/24 23:42:00 UTC

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

Cheng Su created SPARK-37455:
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             Summary: 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


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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