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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-1438) [Performance] MultiQueryOptimizer should also merge DISTINCT jobs
Date Wed, 09 Jun 2010 17:50:13 GMT

    [ https://issues.apache.org/jira/browse/PIG-1438?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12877150#action_12877150
] 

Ashutosh Chauhan commented on PIG-1438:
---------------------------------------

+1 please commit.

> [Performance] MultiQueryOptimizer should also merge DISTINCT jobs
> -----------------------------------------------------------------
>
>                 Key: PIG-1438
>                 URL: https://issues.apache.org/jira/browse/PIG-1438
>             Project: Pig
>          Issue Type: Improvement
>          Components: impl
>    Affects Versions: 0.7.0
>            Reporter: Richard Ding
>            Assignee: Richard Ding
>             Fix For: 0.8.0
>
>         Attachments: PIG-1438.patch, PIG-1438_1.patch
>
>
> Current implementation doesn't merge jobs derived from DISTINCT statements. The reason
is that DISTINCT jobs are implemented using a special combiner (DistinctCombiner). But we
should be able to merge jobs that have the same type of combiner (e.g. merge multiple DISTINCT
jobs into one).

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