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From "Ted Xu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-1999) optimize map-join followed by groupby
Date Sat, 02 Apr 2011 09:36:05 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13014977#comment-13014977
] 

Ted Xu commented on HIVE-1999:
------------------------------

Is this duplicate to HIVE-1695?

> optimize map-join followed by groupby
> -------------------------------------
>
>                 Key: HIVE-1999
>                 URL: https://issues.apache.org/jira/browse/HIVE-1999
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Namit Jain
>
> A query like:
> select /*+ MAPJOIN(a) */ ... from a join b on ..
> group by a.c1,b.c2;
> should be performed in 1 MR job.
> This should be later optimized for joins also - if the join can be converted to a map-join.

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