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From "Cheolsoo Park (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PIG-3562) Implement combiner optimizations for DISTINCT
Date Wed, 08 Jan 2014 23:40:50 GMT

     [ https://issues.apache.org/jira/browse/PIG-3562?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Cheolsoo Park updated PIG-3562:
-------------------------------

    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

+1.

Committed to tez branch. Thank you Alex!

> Implement combiner optimizations for DISTINCT
> ---------------------------------------------
>
>                 Key: PIG-3562
>                 URL: https://issues.apache.org/jira/browse/PIG-3562
>             Project: Pig
>          Issue Type: Sub-task
>          Components: tez
>    Affects Versions: tez-branch
>            Reporter: Alex Bain
>            Assignee: Alex Bain
>             Fix For: tez-branch
>
>         Attachments: PIG-3562-0.patch
>
>
> Currently, DISTINCT is implemented in a straightforward manner per https://issues.apache.org/jira/browse/PIG-3538.
> However, we can implement two types of combiner optimizations for DISTINCT, just as the
MRCompiler does for map-reduce:
> 1. A simple DistinctCombiner that throws away the duplicate tuples
> 2. An optimizer that transforms certain uses of DISTINCT into an algebraic udf form



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