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https://issues.apache.org/jira/browse/ARROW-13764?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17405297#comment-17405297
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David Li commented on ARROW-13764:
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Well, it would be neither, since both of those are about the values, not the
groups. If this is about the groups, maybe this should actually be an option
for the aggregation itself instead. If it's for the values, then it would be
CountOptions.
> [C++] Implement ScalarAggregateOptions for count_distinct (grouped)
> --------------------------------------------------------------------
>
> Key: ARROW-13764
> URL: https://issues.apache.org/jira/browse/ARROW-13764
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Nic Crane
> Assignee: David Li
> Priority: Major
> Labels: kernel
> Fix For: 6.0.0
>
>
> I'm writing the R bindings for the grouped {{count_distinct}} kernel, but the
> current implementation counts nulls as their own group. To match the R
> behaviour, I need to be able to specify whether or not to remove NA/NULL
> values.
> Please could we have ScalarAggregateOptions implemented for
> {{count_distinct}}?
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