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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1353) Map-side joins
Date Sat, 03 Apr 2010 01:22:27 GMT

     [ https://issues.apache.org/jira/browse/PIG-1353?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ashutosh Chauhan updated PIG-1353:
----------------------------------

    Attachment: pig-1353.patch

An illustrative patch which achieves this.

> 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
>         Attachments: 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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