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https://issues.apache.org/jira/browse/PIG-750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12973357#action_12973357
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Scott Carey commented on PIG-750:
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Awesome!
This is a huge improvement for several of my use cases.
> Use combiner when algebraic UDFs are used in expressions
> --------------------------------------------------------
>
> Key: PIG-750
> URL: https://issues.apache.org/jira/browse/PIG-750
> Project: Pig
> Issue Type: Improvement
> Reporter: Amir Youssefi
> Assignee: Thejas M Nair
> Priority: Minor
> Fix For: 0.9.0
>
> Attachments: PIG-750.1.patch
>
>
> Currently Pig uses combiner when all a,b, c,... are algebraic (e.g. SUM, AVG
> etc.) in foreach:
> foreach X generate a,b,c,...
> It's a performance improvement if it uses combiner when a mix of algebraic
> and non-algebraic functions are used as well.
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