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https://issues.apache.org/jira/browse/PIG-51?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12551565
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Alan Gates commented on PIG-51:
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+1, patch looks good.
> Combiner gives wrong result in the presence of flattening
> ---------------------------------------------------------
>
> Key: PIG-51
> URL: https://issues.apache.org/jira/browse/PIG-51
> Project: Pig
> Issue Type: Bug
> Reporter: Utkarsh Srivastava
> Priority: Critical
> Attachments: combiner-flatten.patch
>
>
> If you do something like
> a = load ... as (f1,f2,f3);
> b = group a by (f1,f2);
> c = foreach b generate flatten(group), SUM(a.f3);
> The reduce side refers to field number expecting data will not have been
> flattened yet. But if the combiner kicks in, it already flattens the group,
> leading to column references being wrong.
>
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