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https://issues.apache.org/jira/browse/ARROW-13574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou resolved ARROW-13574.
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Resolution: Fixed
Issue resolved by pull request 10895
[https://github.com/apache/arrow/pull/10895]
> [C++] Add 'count all' option to count (hash) aggregate kernel
> -------------------------------------------------------------
>
> Key: ARROW-13574
> URL: https://issues.apache.org/jira/browse/ARROW-13574
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: David Li
> Assignee: David Li
> Priority: Major
> Labels: kernel, pull-request-available
> Fix For: 6.0.0
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> The current "count" hash aggregate kernel counts either all non-null or all
> null values, but doesn't count all values regardless of nullity (i.e. SQL
> "count(\*)" or Pandas size()).
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