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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12763) Use bit vector to track per partition NDV
Date Thu, 31 Dec 2015 00:32:49 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15075554#comment-15075554
] 

Gopal V commented on HIVE-12763:
--------------------------------

[~pxiong]: FYI, Yahoo has put up a new library for nDV approximation for Hadoop (under Apache
License).

http://datasketches.github.io/

> Use bit vector to track per partition NDV
> -----------------------------------------
>
>                 Key: HIVE-12763
>                 URL: https://issues.apache.org/jira/browse/HIVE-12763
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>
> This will improve merging of per partitions stats.



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