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