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From "Namit Jain (JIRA)" <>
Subject [jira] Created: (HIVE-1999) optimize map-join followed by groupby
Date Sun, 20 Feb 2011 16:11:38 GMT
optimize map-join followed by groupby

                 Key: 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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