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Posted to issues@spark.apache.org by "L. C. Hsieh (Jira)" <ji...@apache.org> on 2021/02/19 19:33:00 UTC

[jira] [Created] (SPARK-34474) Remove unnecessary Union under Distinct like operators

L. C. Hsieh created SPARK-34474:
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             Summary: Remove unnecessary Union under Distinct like operators
                 Key: SPARK-34474
                 URL: https://issues.apache.org/jira/browse/SPARK-34474
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.2.0
            Reporter: L. C. Hsieh
            Assignee: L. C. Hsieh


For an Union under Distinct like operators, if its children are all the same, we can just keep one among them and remove the Union.



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