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Posted to dev@pig.apache.org by "Thejas M Nair (JIRA)" <ji...@apache.org> on 2010/12/19 05:00:13 UTC

[jira] Resolved: (PIG-750) Use combiner when algebraic UDFs are used in expressions

     [ https://issues.apache.org/jira/browse/PIG-750?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Thejas M Nair resolved PIG-750.
-------------------------------

      Resolution: Fixed
    Hadoop Flags: [Reviewed]

Patch committed to trunk.


> 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
>         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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