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Antoine Pitrou authored and Wes McKinney committed 875d05396f9
ARROW-9436: [C++][CI] Fix Valgrind failure Some bits were left uninitialized in the expected boolean array. Also fix some warnings. Closes #7727 from pitrou/ARROW-9436-valgrind-error Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Wes McKinney <wesm@apache.org>