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From "Navis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5381) OOM when using many lead/lag funtions against large partition
Date Mon, 30 Sep 2013 07:08:25 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13781637#comment-13781637
] 

Navis commented on HIVE-5381:
-----------------------------

HIVE-4965 is for skipping final serialization into PTFPartition. This is for making rows of
lead/lag function per row basis instead of per partition basis.

> OOM when using many lead/lag funtions against large partition
> -------------------------------------------------------------
>
>                 Key: HIVE-5381
>                 URL: https://issues.apache.org/jira/browse/HIVE-5381
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Navis
>            Assignee: Navis
>            Priority: Minor
>         Attachments: D13161.1.patch
>
>
> Currently, columns containing window function are evaluated for all rows in a partition,
which possibly make OOM if the partition is big (400MB in my case). For lead/lag functions,
the value can be evaluated per row.



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