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https://issues.apache.org/jira/browse/HIVE-3433?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13466742#comment-13466742
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Namit Jain commented on HIVE-3433:
----------------------------------
Optimized the patch.
This is ready for review.
If a rollup/cube is being performed, hash aggregation is always used.
The possible keys are computed, and the group by operator behaves as if
it received multiple keys (one per grouping set) from the upstream operator.
> Implement CUBE and ROLLUP operators in Hive
> -------------------------------------------
>
> Key: HIVE-3433
> URL: https://issues.apache.org/jira/browse/HIVE-3433
> Project: Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Sambavi Muthukrishnan
> Assignee: Namit Jain
> Attachments: hive.3433.1.patch
>
>
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