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Antoine Pitrou authored and Wes McKinney committed 9d2079c2ead
ARROW-8989: [C++][Doc] Document available compute functions Also fix glaring bugs in arithmetic kernels (signed overflow detection was broken). Closes #7695 from pitrou/ARROW-8989-doc-compute-functions Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Wes McKinney <wesm@apache.org>