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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-1353) Map-side joins
Date Sat, 03 Apr 2010 00:42:27 GMT
Map-side joins
--------------

                 Key: PIG-1353
                 URL: https://issues.apache.org/jira/browse/PIG-1353
             Project: Pig
          Issue Type: Improvement
          Components: impl
            Reporter: Ashutosh Chauhan
            Assignee: Ashutosh Chauhan


Pig already has couple of map-side join implementations: Merge Join and Fragmented-Replicate
Join. But both of them are pretty restrictive. Merge Join can only join two tables and that
too can only do inner join. FR Join can join multiple relations, but it can also only do inner
and left outer joins. Further it restricts the sizes of side relations. It will be nice if
we can do map side joins on multiple tables as well do inner, left outer, right outer and
full outer joins. 

Lot of groundwork for this has already been done in PIG-1309. Remaining will be tracked in
this jira.   

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