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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1353) Map-side joins
Date Fri, 16 Apr 2010 15:52:25 GMT

    [ https://issues.apache.org/jira/browse/PIG-1353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12857866#action_12857866
] 

Alan Gates commented on PIG-1353:
---------------------------------

Why did you convert all of the visitor methods in LogToPhysTranslator and LOVisitor from public
to protected?  That seems unrelated to your changes.



> 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
>             Fix For: 0.8.0
>
>         Attachments: pig-1353.patch, pig-1353.patch
>
>
> 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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