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https://issues.apache.org/jira/browse/HIVE-21568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16812701#comment-16812701
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Jesus Camacho Rodriguez commented on HIVE-21568:
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[~vgarg], that method returns false for any operator that is not recognized,
e.g., limit, union, or any other:
https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/HiveRelOptUtil.java#L535
Hence, the method will produce the expected output.
A project with a non-deterministic expression does not alter the number of rows
produced by the project operator.
> 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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