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https://issues.apache.org/jira/browse/ARROW-15609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Li resolved ARROW-15609.
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Fix Version/s: 8.0.0
Resolution: Fixed
Issue resolved by pull request 12369
[https://github.com/apache/arrow/pull/12369]
> [C++][Compute] Support hash_aggregate with only keys
> ----------------------------------------------------
>
> Key: ARROW-15609
> URL: https://issues.apache.org/jira/browse/ARROW-15609
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Chenxi Li
> Assignee: Chenxi Li
> Priority: Minor
> Labels: pull-request-available
> Fix For: 8.0.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> Currently, hash_aggregate requires keys, arguments and aggregation function,
> sometimes a user wants to execute group by without any aggregation functions.
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