Commits
Antoine Pitrou authored and Micah Kornfield committed e9a12fabb8e
ARROW-10058: [C++] Improve repeated levels conversion without BMI2 Use a lookup table to emulate PEXT 5 bits at a time. Remove the slow scalar path. Closes #8320 from pitrou/ARROW-10058-faster-sw-pext Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Micah Kornfield <emkornfield@gmail.com>