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https://issues.apache.org/jira/browse/HIVE-19376?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16505855#comment-16505855
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Prasanth Jayachandran commented on HIVE-19376:
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I don't think is required anymore as HIVE-18079 already switched to 10 bit HLL
for column stats NDV.
> Statistics: switch to 10bit HLL by default for Hive
> ---------------------------------------------------
>
> Key: HIVE-19376
> URL: https://issues.apache.org/jira/browse/HIVE-19376
> Project: Hive
> Issue Type: Sub-task
> Components: Statistics
> Reporter: Gopal V
> Assignee: Gopal V
> Priority: Major
> Attachments: HIVE-19376.1.patch
>
>
> This reduces the memory usage for the metastore cache and the size of
> bit-vectors in the DB by 16x.
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