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Eduardo PonceDavid Li
293f8564164
Eduardo Ponce authored and David Li committed 9122149de71
ARROW-13937: [C++][Compute] Add explicit output values to sign function and fix unary type checks

This PR adds explicit output values to the sign function for the unsigned integer kernel. This makes the kernel more readable and consistent with the other sign kernels.

Also, enable_if checks are fixed for scalar unary arithmetic functions (sign, negate, absolute, ceil/floor/trunc).

Closes #11113 from edponce/ARROW-13937-Compute-Add-explicit-output-values-to-si

Authored-by: Eduardo Ponce <edponce00@gmail.com>
Signed-off-by: David Li <li.davidm96@gmail.com>