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  1. Apache Arrow
  2. ARROW-13295

[C++] Implement hash_aggregate mean/stdev/variance kernels

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      We have scalar aggregate kernels for these already that can serve as the basis for a hash aggregate implementation.

      Depends on ARROW-12759 as that refactors  how hash aggregate kernels are implemented.

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              lidavidm David Li
              lidavidm David Li
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