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https://issues.apache.org/jira/browse/SPARK-24893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16553286#comment-16553286
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Apache Spark commented on SPARK-24893:
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User 'dbtsai' has created a pull request for this issue:
https://github.com/apache/spark/pull/21852
> Remove the entire CaseWhen if all the outputs are semantic equivalence
> ----------------------------------------------------------------------
>
> Key: SPARK-24893
> URL: https://issues.apache.org/jira/browse/SPARK-24893
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: DB Tsai
> Assignee: DB Tsai
> Priority: Major
>
> Similar to [SPARK-24890], if all the outputs of `CaseWhen` are semantic
> equivalence, `CaseWhen` can be removed.
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