[jira] Commented: (PIG-450) PERFORMANCE: Distinct should make use of combiner to remove duplicate values from keys.

["Olga Natkovich (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12633986#action_12633986 ] 

Olga Natkovich commented on PIG-450:
------------------------------------

+1

> PERFORMANCE:  Distinct should make use of combiner to remove duplicate values from keys.
> ----------------------------------------------------------------------------------------
>
>                 Key: PIG-450
>                 URL: https://issues.apache.org/jira/browse/PIG-450
>             Project: Pig
>          Issue Type: Bug
>          Components: impl
>    Affects Versions: types_branch
>            Reporter: Alan Gates
>            Assignee: Alan Gates
>             Fix For: types_branch
>
>         Attachments: PIG-450.patch
>
>
> In 2.0 distinct was improved by removing values in the map and just passing an empty tuple along with the key.  This can be further improved by adding a combiner step that passes along only the first empty tuple instead of all of them.

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