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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:
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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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