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Antoine Pitrou authored and David Li committed 4384b65b5cf
ARROW-11548: [C++] Fix RandomArrayGenerator::List * Fix length of returned list * Fix computed null count where first or last entry is null Closes #9911 from pitrou/ARROW-11548-random-list Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: David Li <li.davidm96@gmail.com>