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https://issues.apache.org/jira/browse/IMPALA-5449?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jim Apple resolved IMPALA-5449.
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Resolution: Not A Bug
Impala's {{NDV}} is already implemented using HyperLogLog++.
> Implement HyperLogLog++
> -----------------------
>
> Key: IMPALA-5449
> URL: https://issues.apache.org/jira/browse/IMPALA-5449
> Project: IMPALA
> Issue Type: Improvement
> Components: be
> Affects Versions: Impala 2.9.0
> Reporter: Manish Maheshwari
>
> Implement HyperLogLog++ for Impala with the below references -
>
> 1 - https://research.google.com/pubs/pub40671.html
> 2 - https://github.com/dialtr/libcount - C++ implementation
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