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From "Jitendra Nath Pandey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-6222) Make Vector Group By operator abandon grouping if too many distinct keys
Date Sun, 23 Mar 2014 18:36:46 GMT

    [ https://issues.apache.org/jira/browse/HIVE-6222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13944520#comment-13944520
] 

Jitendra Nath Pandey commented on HIVE-6222:
--------------------------------------------

I have committed this to branch-0.13 as well.

> 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: 0.13.0
>
>         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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