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https://issues.apache.org/jira/browse/HIVE-6222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13944165#comment-13944165
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Harish Butani commented on HIVE-6222:
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+1 for 0.13
> Make Vector Group By operator abandon grouping if too many distinct keys
> ------------------------------------------------------------------------
>
> Key: HIVE-6222
> URL: https://issues.apache.org/jira/browse/HIVE-6222
> Project: Hive
> Issue Type: Sub-task
> Components: Query Processor
> Affects Versions: 0.13.0
> Reporter: Remus Rusanu
> Assignee: Remus Rusanu
> Priority: Minor
> Labels: vectorization
> Fix For: 0.14.0
>
> Attachments: HIVE-6222.1.patch, HIVE-6222.2.patch, HIVE-6222.3.patch,
> HIVE-6222.4.patch, HIVE-6222.5.patch
>
>
> Row mode GBY is becoming a pass-through if not enough aggregation occurs on
> the map side, relying on the shuffle+reduce side to do the work. Have VGBY do
> the same.
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