optimize map-join followed by groupby
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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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