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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4105) Hive MapJoinOperator unnecessarily deserializes values for all join-keys
Date Wed, 10 Apr 2013 17:22:16 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13628004#comment-13628004
] 

Ashutosh Chauhan commented on HIVE-4105:
----------------------------------------

A comment on RB.
                
> Hive MapJoinOperator unnecessarily deserializes values for all join-keys
> ------------------------------------------------------------------------
>
>                 Key: HIVE-4105
>                 URL: https://issues.apache.org/jira/browse/HIVE-4105
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Vinod Kumar Vavilapalli
>            Assignee: Vinod Kumar Vavilapalli
>         Attachments: HIVE-4105-20130301.1.txt, HIVE-4105-20130301.txt, HIVE-4105.patch
>
>
> We can avoid this for inner-joins. Hive does an explicit value de-serialization up front
so even for those rows which won't emit output. In these cases, we can do just with key de-serialization.

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