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https://issues.apache.org/jira/browse/SPARK-25450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16618505#comment-16618505
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Xiao Li commented on SPARK-25450:
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https://github.com/apache/spark/pull/22447
> PushProjectThroughUnion rule uses the same exprId for project expressions in
> each Union child, causing mistakes in constant propagation
> ---------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-25450
> URL: https://issues.apache.org/jira/browse/SPARK-25450
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.1
> Reporter: Maryann Xue
> Priority: Major
>
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