Michal Nowakiewicz created ARROW-12726:
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Summary: [C++][Compute] GroupBy: add parallelism to hash group by
Key: ARROW-12726
URL: https://issues.apache.org/jira/browse/ARROW-12726
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Affects Versions: 4.0.0
Reporter: Michal Nowakiewicz
Fix For: 5.0.0
Implement parallel processing for hash group by.
Make sure it works well (scales) for different cardinalities of groups.
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