ARROW-4124: [C++] Draft Aggregate and Sum kernels#3407

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fsaintjacques:ARROW-4124-aggregation-kernel

Commits on Feb 9, 2019

ARROW-4124: Implement Aggregate and Sum kernels

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Fix

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Fix warnings

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Fix lint issues.

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Doxygen error

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Refactor

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lint and format

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Remove mutex header

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Use bigger width type for accumulator.

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Warnings

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Commits on Feb 10, 2019