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

["tenglei (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-27314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17536503#comment-17536503 ] 

tenglei commented on SPARK-27314:
---------------------------------

I note that this pr refers to a temporary issue，but I'm not clear the problem that  with self-union when children have the same expression id. Could you explain the problem or show an simple example that when same expression id happen in self-union?[~ueshin]

> 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
>            Assignee: Takuya Ueshin
>            Priority: Major
>             Fix For: 3.0.0
>
>
> 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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