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https://issues.apache.org/jira/browse/HIVE-21568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16812685#comment-16812685
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Vineet Garg commented on HIVE-21568:
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[~jcamachorodriguez] What if project is projecting indeterministic expressions
e.g random? It will alter the cardinality no?
Also how about UNION, INTERSECT etc set operators?
> HiveRelOptUtil.isRowFilteringPlan should skip Project
> -----------------------------------------------------
>
> Key: HIVE-21568
> URL: https://issues.apache.org/jira/browse/HIVE-21568
> Project: Hive
> Issue Type: Bug
> Components: CBO
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Attachments: HIVE-21568.01.patch, HIVE-21568.01.patch
>
>
> Project operator should not return true in any case, this may trigger
> additional rewritings in presence of constraints.
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