[jira] Assigned: (PIG-51) Combiner gives wrong result in the presence of flattening

[Alan Gates (JIRA)]

     [ 
https://issues.apache.org/jira/browse/PIG-51?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Alan Gates reassigned PIG-51:
-----------------------------

    Assignee: Utkarsh Srivastava

> 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
>            Assignee: Utkarsh Srivastava
>            Priority: Critical
>             Fix For: 0.1.0
>
>         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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