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Eduardo PonceAntoine Pitrou
70b7330819f
Eduardo Ponce authored and Antoine Pitrou committed 9ad25626961
ARROW-11693: [C++] Add string length kernel

This PR adds the *utf8_length* compute kernel to the string scalar functions to support calculating the string length (as number of characters) for UTF-8 encoded STRINGs and LARGE STRINGs. The implementation makes use of utf8proc (utf8proc_iterate) to perform the calculation.

Closes #9786 from edponce/ARROW-11693-Add-string-length-kernel

Authored-by: Eduardo Ponce <edponce00@gmail.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>