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Posted to issues@spark.apache.org by "Takuya Ueshin (JIRA)" <ji...@apache.org> on 2019/03/28 08:19:00 UTC

[jira] [Created] (SPARK-27314) Deduplicate exprIds for Union.

Takuya Ueshin created SPARK-27314:
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             Summary: Deduplicate exprIds for Union.
                 Key: SPARK-27314
                 URL: https://issues.apache.org/jira/browse/SPARK-27314
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Takuya Ueshin


We have been having a potential problem with {{Union}} when the children have the same expression id in their outputs, which happens when self-union.



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