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GH-41035: [C++] Add a grouper benchmark for preventing performance regression
Rationale for this change
Add a grouper benchmark for preventing performance regression .
https://github.com/apache/arrow/pull/40998#issuecomment-2039204161.
What changes are included in this PR?
Added a benchmark.
Are these changes tested?
Needn't.
Are there any user-facing changes?
No
- GitHub Issue: #41035