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Posted to dev@hive.apache.org by "Kevin Wilfong (Commented) (JIRA)" <ji...@apache.org> on 2012/03/20 22:23:41 UTC

[jira] [Commented] (HIVE-942) use bucketing for group by

    [ https://issues.apache.org/jira/browse/HIVE-942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233789#comment-13233789 ] 

Kevin Wilfong commented on HIVE-942:
------------------------------------

If the table is bucketed and sorted on the group by keys, the group by operator would not need to do a hash, which would help with memory consumption.
                
> use bucketing for group by
> --------------------------
>
>                 Key: HIVE-942
>                 URL: https://issues.apache.org/jira/browse/HIVE-942
>             Project: Hive
>          Issue Type: New Feature
>          Components: Query Processor
>            Reporter: Namit Jain
>
> 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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