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David LiBenjamin Kietzman
d55383dc965
David Li authored and Benjamin Kietzman committed dbeed527dff
ARROW-13064: [C++] Implement select ('case when') function for fixed-width types

This doesn't support variable-width types (e.g. strings) as the implementation here is columnwise. I will work on those separately (they require a rowwise implementation).

Also fixes a small bug in the CommonNumericType implementation (I noticed uint8 was getting promoted to int8).

Closes #10557 from lidavidm/arrow-13064

Authored-by: David Li <li.davidm96@gmail.com>
Signed-off-by: Benjamin Kietzman <bengilgit@gmail.com>