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https://issues.apache.org/jira/browse/ARROW-14035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17419366#comment-17419366
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David Li commented on ARROW-14035:
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{{value_counts}} gives you a histogram where the x-axis are the distinct values
and the y-axis is the number of occurrences of that value. {{count_distinct}}
is just {{COUNT(DISTINCT *)}}.
Also, {{value_counts}} is a vector kernel whereas this should be a scalar
aggregate kernel.
> [C++][Compute] Implement non-hash count_distinct aggregate kernel
> -----------------------------------------------------------------
>
> Key: ARROW-14035
> URL: https://issues.apache.org/jira/browse/ARROW-14035
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Ian Cook
> Assignee: Percy Camilo Triveño Aucahuasi
> Priority: Critical
> Labels: kernel
> Fix For: 6.0.0
>
>
> ARROW-12728 added a {{hash_count_distinct}} hash aggregate kernel, but there
> is no non-hash {{count_distinct}} aggregate kernel.
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