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https://issues.apache.org/jira/browse/HIVE-9215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14258541#comment-14258541
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Szehon Ho commented on HIVE-9215:
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FYI [~jcamachorodriguez], [~ashutoshc] you guys might be interested.
> Some mapjoin queries broken with IdentityProjectRemover with PPD
> ----------------------------------------------------------------
>
> Key: HIVE-9215
> URL: https://issues.apache.org/jira/browse/HIVE-9215
> Project: Hive
> Issue Type: Bug
> Components: Logical Optimizer
> Affects Versions: 0.15.0
> Reporter: Szehon Ho
> Attachments: auto_join_ppd.q
>
>
> IdentityProjectRemover (hive.optimize.remove.identity.project) with PPD will
> sometimes make mapjoin query that returns the wrong result in MR case as well.
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