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https://issues.apache.org/jira/browse/HIVE-10785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14906922#comment-14906922
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Jesus Camacho Rodriguez commented on HIVE-10785:
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+1 (pending QA)
> Support aggregate push down through joins
> -----------------------------------------
>
> Key: HIVE-10785
> URL: https://issues.apache.org/jira/browse/HIVE-10785
> Project: Hive
> Issue Type: Bug
> Components: CBO, Logical Optimizer
> Reporter: Jesus Camacho Rodriguez
> Assignee: Ashutosh Chauhan
> Attachments: HIVE-10785.2.patch, HIVE-10785.3.patch,
> HIVE-10785.4.patch, HIVE-10785.5.patch, HIVE-10785.6.patch, HIVE-10785.patch
>
>
> Enable {{AggregateJoinTransposeRule}} in CBO that pushes Aggregate through
> Join operators. The rule has been extended in Calcite 1.4 to cover complex
> cases e.g. Aggregate operators comprising UDAF. The decision on whether to
> push the Aggregate through Join or not should be cost-driven.
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