Chenxi Li created ARROW-15609:
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Summary: [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
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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