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https://issues.apache.org/jira/browse/PIG-946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pradeep Kamath updated PIG-946:
-------------------------------

    Attachment: PIG-946-codechange-draft.patch

Attached patch has a first draft of the code changes required in 
CombinerOptiimizer.java. This is a non tested draft patch - needs to be 
augmented with testcases - attaching it merely for reference - should not be 
committed yet.

> Combiner optimizer does not optimize when limit follow group, foreach
> ---------------------------------------------------------------------
>
>                 Key: PIG-946
>                 URL: https://issues.apache.org/jira/browse/PIG-946
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.3.0
>            Reporter: Pradeep Kamath
>         Attachments: PIG-946-codechange-draft.patch
>
>
> The following script is combinable but is not optimized:
> a = load '/user/pig/tests/data/singlefile/studenttab10k';
> b = group a by $1;
> c = foreach b generate group, AVG(a.$2);
> d = limit c 10;
> dump d;

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