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Eduardo PonceBenjamin Kietzman
5ccbca02bd7
Eduardo Ponce authored and Benjamin Kietzman committed f345287a157
ARROW-12861: [C++][Compute] Add sign function kernels

This PR adds the sign function to the compute layer as a unary scalar function.
* Numeric inputs result in any of (-1,0,1)
* +/-0 input returns 0
* Infinity is treated as a signed number
* NaN input returns NaN

Closes #10395 from edponce/ARROW-12861-Compute-Add-sign-function-kernels

Authored-by: Eduardo Ponce <edponce00@gmail.com>
Signed-off-by: Benjamin Kietzman <bengilgit@gmail.com>