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https://issues.apache.org/jira/browse/PIG-890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12745840#action_12745840
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Daniel Dai commented on PIG-890:
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Forget 4, I see it in [PigSampler|http://wiki.apache.org/pig/PigSampler]

> Create a sampler interface and improve the skewed join sampler
> --------------------------------------------------------------
>
>                 Key: PIG-890
>                 URL: https://issues.apache.org/jira/browse/PIG-890
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Sriranjan Manjunath
>         Attachments: sampler.patch
>
>
> We need a different sampler for order by and skewed join. We thus need a 
> better sampling interface. The design of the same is described here: 
> http://wiki.apache.org/pig/PigSampler

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