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https://issues.apache.org/jira/browse/PIG-2661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13403739#comment-13403739
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Dmitriy V. Ryaboy commented on PIG-2661:
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I see what you mean now -- yeah, our options in this case are to either not
perform the optimization, or to push the operator chain *above* the sample
loader, and sample its outputs instead of its inputs.
But on the flatten thing, it occurs to me that we actually shouldn't allow the
merge join here, as we can't guarantee sorted order after a flatten. Or can we?
Is there a reason to believe order will stay the same after a flatten?
> Pig uses an extra job for loading data in Pigmix L9
> ---------------------------------------------------
>
> Key: PIG-2661
> URL: https://issues.apache.org/jira/browse/PIG-2661
> Project: Pig
> Issue Type: Improvement
> Affects Versions: 0.9.0
> Reporter: Jie Li
> Assignee: Jie Li
> Attachments: PIG-2661.0.patch, PIG-2661.1.patch, PIG-2661.2.patch,
> PIG-2661.3.patch, PIG-2661.plan.txt
>
>
> See
> https://issues.apache.org/jira/browse/PIG-200?focusedCommentId=13260155&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13260155
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