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From "Navis (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-5381) OOM when using many lead/lag funtions against large partition
Date Fri, 27 Sep 2013 08:03:02 GMT

     [ https://issues.apache.org/jira/browse/HIVE-5381?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Navis updated HIVE-5381:
------------------------

    Status: Patch Available  (was: Open)

Initial patch. 

can be optimized further and row_number() also can be included in this category.
                
> 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
>
> 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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