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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2673) Allow Merge join to follow an ORDER statement
Date Tue, 08 May 2012 18:55:51 GMT

    [ https://issues.apache.org/jira/browse/PIG-2673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13270713#comment-13270713
] 

Ashutosh Chauhan commented on PIG-2673:
---------------------------------------

bq. I don't think you can relax the conditions around distinct, since that involves hashing
the input across reducers?

Yeah, thats right. For other blocking operators:
* Order-by: obv we can relax it.
* Join/Cogroup: We can relax for map-side joins & cogroups i.e., FR,Merge Join and cogroup,
but not the ones having reducers.


                
> Allow Merge join to follow an ORDER statement
> ---------------------------------------------
>
>                 Key: PIG-2673
>                 URL: https://issues.apache.org/jira/browse/PIG-2673
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Dmitriy V. Ryaboy
>            Assignee: Dmitriy V. Ryaboy
>         Attachments: PIG-2673_0.patch
>
>
> Currently, we insist that data for a merge join must come from an OrderedLoadFunc.
> We can relax this condition and allow explicit ordering operations to precede a MergeJoin.

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