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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-942) use bucketing for group by
Date Thu, 19 Nov 2009 02:27:39 GMT

    [ https://issues.apache.org/jira/browse/HIVE-942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779802#action_12779802
] 

Namit Jain commented on HIVE-942:
---------------------------------

However, a single mapper may take a long time if there is skew

> use bucketing for group by
> --------------------------
>
>                 Key: HIVE-942
>                 URL: https://issues.apache.org/jira/browse/HIVE-942
>             Project: Hadoop Hive
>          Issue Type: New Feature
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: He Yongqiang
>             Fix For: 0.5.0
>
>
> Group by on a bucketed column can be completely performed on the mapper if the split
can be adjusted to span the key boundary.

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