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https://issues.apache.org/jira/browse/HIVE-15227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15708332#comment-15708332
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Jesus Camacho Rodriguez commented on HIVE-15227:
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LGTM, +1
Is there a Calcite issue to make SemiJoinRule use a custom RelBuilder? Could
you create it/link it to this issue? We should try to include it in new Calcite
release.
You might want to run locally _auto_sortmerge_join_2.q_ to double-check that it
is not related to the patch.
> 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
> 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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