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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (PIG-7) Optimize execution of algebraic functions
Date Mon, 12 Jan 2009 17:06:07 GMT

     [ https://issues.apache.org/jira/browse/PIG-7?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Olga Natkovich resolved PIG-7.

    Resolution: Fixed

resolved with types branch

> Optimize execution of algebraic functions
> -----------------------------------------
>                 Key: PIG-7
>                 URL: https://issues.apache.org/jira/browse/PIG-7
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>            Reporter: Olga Natkovich
>            Assignee: Alan Gates
>         Attachments: combiner.patch, combiner2.patch, combiner3.patch, pig7.patch
> Algebraic are functions that can be computed incrementally like count(X), SUM(X), etc.
They can be computed effciently by doing the first level computation using hadoop combiner.
This can give a significant (2-3x) speedup for many aggregation queries. 
> Several users asked us for this feature so it is pretty high priority.

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