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