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Posted to dev@hive.apache.org by "Vinod Kumar Vavilapalli (JIRA)" <ji...@apache.org> on 2013/04/09 20:28:17 UTC

[jira] [Updated] (HIVE-4105) Hive MapJoinOperator unnecessarily deserializes values for all join-keys

     [ https://issues.apache.org/jira/browse/HIVE-4105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vinod Kumar Vavilapalli updated HIVE-4105:
------------------------------------------

    Attachment: HIVE-4105.patch

Latest patch addressing Vikram's comments.

Created review board request at https://reviews.apache.org/r/10323/.
                
> 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
>         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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