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https://issues.apache.org/jira/browse/PIG-3759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13903047#comment-13903047
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Cheolsoo Park commented on PIG-3759:
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+1.
I have noticed this issue too.
> CombinerOptimizer should not optimize cogroup case in tez
> ---------------------------------------------------------
>
> Key: PIG-3759
> URL: https://issues.apache.org/jira/browse/PIG-3759
> Project: Pig
> Issue Type: Sub-task
> Components: tez
> Affects Versions: tez-branch
> Reporter: Daniel Dai
> Assignee: Daniel Dai
> Fix For: tez-branch
>
> Attachments: PIG-3759-1.patch
>
>
> Should be inline with mapreduce. This cause a couple of e2e test failures,
> eg, GroupAggFunc_13.
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