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https://issues.apache.org/jira/browse/PIG-161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12590707#action_12590707
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Pi Song commented on PIG-161:
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@Shravan,
You're right. POSort and PODistinct also have the same characteristic. What I'm 
doing now is trying to explore different concepts and come up with a "beautiful 
processing model" (That's why I'm in this open source project). This might not 
be a part of Pig and possibly I will never come up with a good one. If you have 
already got a solution (and you've already done a very good work), please go 
for it!.

> Rework physical plan
> --------------------
>
>                 Key: PIG-161
>                 URL: https://issues.apache.org/jira/browse/PIG-161
>             Project: Pig
>          Issue Type: Sub-task
>            Reporter: Alan Gates
>            Assignee: Alan Gates
>         Attachments: arithmeticOperators.patch, incr2.patch, incr3.patch, 
> incr4.patch, incr5.patch, MRCompilerTests_PlansAndOutputs.txt, 
> Phy_AbsClass.patch, pogenerate.patch, pogenerate.patch, pogenerate.patch, 
> posort.patch
>
>
> This bug tracks work to rework all of the physical operators as described in 
> http://wiki.apache.org/pig/PigTypesFunctionalSpec

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