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Frank DuWes McKinney
6716bbd25ea
Frank Du authored and Wes McKinney committed ac74b3be02d
ARROW-8772: [C++] Unrolled aggregate dense for better speculative execution

1. Expand SumKernel benchmark to more types(Float, Double, Int8, Int16, Int32, Int64).
2. Unrolled the aggregate kernel dense part to speculative add the result in parrel.

Signed-off-by: Frank Du <frank.du@intel.com>

Closes #7267 from jianxind/SumKernelBenchmark

Authored-by: Frank Du <frank.du@intel.com>
Signed-off-by: Wes McKinney <wesm+git@apache.org>