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