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Antoine PitrouWes McKinney
45e41cad3ed
Antoine Pitrou authored and Wes McKinney committed b829f534d32
ARROW-6385: [C++] Use xxh3 instead of custom hashing code for non-tiny strings

This yields better performance in addition to relying on less custom code.

Closes #5265 from pitrou/ARROW-6385-xxh3 and squashes the following commits:

ce7f9389a <Antoine Pitrou> ARROW-6385:  Use xxh3 instead of custom hash code for non-tiny strings

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Wes McKinney <wesm+git@apache.org>