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https://issues.apache.org/jira/browse/IMPALA-9593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17094141#comment-17094141
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Jim Apple commented on IMPALA-9593:
-----------------------------------
What is the motivation for this ticket - is there an issue with the ndv
function this will address?
> Implement count(distinct) function (DataSketches/HLL)
> -----------------------------------------------------
>
> Key: IMPALA-9593
> URL: https://issues.apache.org/jira/browse/IMPALA-9593
> Project: IMPALA
> Issue Type: Epic
> Components: Backend
> Reporter: Boglarka Egyed
> Assignee: Gabor Kaszab
> Priority: Major
>
> Implement the count(distinct) function from the DataSketches library for HLL
> in C++.
> General info about the sketch:
> http://datasketches.apache.org/docs/HLL/HLL.html
> C++ implementation to wrap:
> https://github.com/apache/incubator-datasketches-cpp/tree/master/hll
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