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Posted to dev@pig.apache.org by "Richard Ding (JIRA)" <ji...@apache.org> on 2010/06/08 19:01:11 UTC

[jira] Updated: (PIG-1438) [Performance] MultiQueryOptimizer should also merge DISTINCT jobs

     [ https://issues.apache.org/jira/browse/PIG-1438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Richard Ding updated PIG-1438:
------------------------------

    Attachment: PIG-1438.patch

> [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
>
>
> 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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