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https://issues.apache.org/jira/browse/SPARK-21619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16113510#comment-16113510
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Mark Hamstra commented on SPARK-21619:
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Ok, but my point is that if plans are to be canonicalized for some reasons,
maybe they should also be canonicalized before execution. It seems odd both to
execute plans that are not in a canonical form and to not be able to execute
plans that are in a canonical form. That view makes failing the execution of
canonical plans look more like a workaround/hack (maybe needed in the short
term) than a solution to a deeper issue.
> Fail the execution of canonicalized plans explicitly
> ----------------------------------------------------
>
> Key: SPARK-21619
> URL: https://issues.apache.org/jira/browse/SPARK-21619
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Reynold Xin
> Assignee: Reynold Xin
>
> Canonicalized plans are not supposed to be executed. I ran into a case in
> which there's some code that accidentally calls execute on a canonicalized
> plan. This patch throws a more explicit exception when that happens.
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