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