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From "Gang Tim Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4150) optimize queries like 'select count(1) from T where <conditions on partition columns>'
Date Tue, 12 Mar 2013 21:37:14 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4150?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13600507#comment-13600507
] 

Gang Tim Liu commented on HIVE-4150:
------------------------------------

Instead of scanning partition's data, we can read stats from metastore directly if it is available.

No. of row.
                
> optimize queries like 'select count(1) from T where <conditions on partition columns>'
> --------------------------------------------------------------------------------------
>
>                 Key: HIVE-4150
>                 URL: https://issues.apache.org/jira/browse/HIVE-4150
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Gang Tim Liu
>
> If accurate stats are available in the metastore, they should be used to
> optimize the above query.

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