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Posted to issues@spark.apache.org by "L. C. Hsieh (Jira)" <ji...@apache.org> on 2025/08/06 20:31:00 UTC

[jira] [Created] (SPARK-53155) Global lower agggregation should not be removed

L. C. Hsieh created SPARK-53155:
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             Summary: Global lower agggregation should not be removed
                 Key: SPARK-53155
                 URL: https://issues.apache.org/jira/browse/SPARK-53155
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 4.0.0, 3.5.6, 3.4.4
            Reporter: L. C. Hsieh


The optimizer rule RemoveRedundantAggregates removes redundant lower aggregation from a query plan and replace it with a project of referred non-aggregate expressions. However, if the removed aggregation is a global one, that is not correct because a project is different with a global aggregation in semantics.



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