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https://issues.apache.org/jira/browse/HIVE-9248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14587209#comment-14587209
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Jason Dere commented on HIVE-9248:
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+1
> Vectorization : Tez Reduce vertex not getting vectorized when GROUP BY is
> Hash mode
> -----------------------------------------------------------------------------------
>
> Key: HIVE-9248
> URL: https://issues.apache.org/jira/browse/HIVE-9248
> Project: Hive
> Issue Type: Bug
> Components: Tez, Vectorization
> Affects Versions: 0.14.0
> Reporter: Matt McCline
> Assignee: Matt McCline
> Priority: Critical
> Attachments: HIVE-9248.01.patch, HIVE-9248.02.patch,
> HIVE-9248.03.patch, HIVE-9248.04.patch, HIVE-9248.05.patch, HIVE-9248.06.patch
>
>
> Under Tez and Vectorization, ReduceWork not getting vectorized unless it
> GROUP BY operator is MergePartial. Add valid cases where GROUP BY is Hash
> (and presumably there are downstream reducers that will do MergePartial).
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