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Antoine PitrouWes McKinney
398466e629b
Antoine Pitrou authored and Wes McKinney committed ff293196baa
ARROW-4087: [C++] Make CSV spellings of null values configurable

Interestingly, there is no noticeable slowdown when reading CSV files (even though the trie is significantly slower than the hard-coded function in microbenchmarks).

Author: Antoine Pitrou <antoine@python.org>

Closes #3236 from pitrou/ARROW-4087-csv-configure-nulls and squashes the following commits:

9a7596ddc <Antoine Pitrou> ARROW-4087:  Make CSV spellings of null values configurable