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Posted to issues@spark.apache.org by "Apache Spark (Jira)" <ji...@apache.org> on 2021/02/19 19:36:00 UTC

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

     [ https://issues.apache.org/jira/browse/SPARK-34474?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-34474:
------------------------------------

    Assignee: Apache Spark  (was: L. C. Hsieh)

> 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: Apache Spark
>            Priority: Major
>
> 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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