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https://issues.apache.org/jira/browse/HIVE-15227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15740649#comment-15740649
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Lefty Leverenz commented on HIVE-15227:
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See commit 7a30ac4abd7f861fc7ba694e43693420ba01745c for the final patch, which
isn't the same as those attached here or in the review board.
> Optimize join + gby into semijoin
> ---------------------------------
>
> Key: HIVE-15227
> URL: https://issues.apache.org/jira/browse/HIVE-15227
> Project: Hive
> Issue Type: Bug
> Components: Logical Optimizer
> Reporter: Ashutosh Chauhan
> Assignee: Ashutosh Chauhan
> Labels: TODOC2.2
> Fix For: 2.2.0
>
> Attachments: HIVE-15227.2.patch, HIVE-15227.3.patch,
> HIVE-15227.4.patch, HIVE-15227.patch
>
>
> Calcite has a rule which can do this transformation. Lets take advantage of
> this since Hive has native Left semi join operator.
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