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Yibo CaiAntoine Pitrou
625bf3f8ae3
Yibo Cai authored and Antoine Pitrou committed e2d8dc38cd1
ARROW-10304: [C++][Compute] Optimize variance kernel for integers

Improve variance kernel performance for integers by leveraging
textbook one pass algorithm and integer arithmetic.

Closes #8466 from cyb70289/variance-integer

Authored-by: Yibo Cai <yibo.cai@arm.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>