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Antoine Pitrou
ba7936f2d68
Antoine Pitrou authored 9df22721ba0
ARROW-7510: [C++] Make ArrayData::null_count thread-safe

This is a minor API break.  ArrayData::null_count still converts implicitly to int64_t.

Closes #6184 from pitrou/ARROW-7510-atomic-null-count and squashes the following commits:

416879622 <Antoine Pitrou> ARROW-7510:  Make ArrayData::null_count thread-safe

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Antoine Pitrou <antoine@python.org>