Commits
Uwe L. Korn authored and Wes McKinney committed ad0157547a4
ARROW-553: C++: Faster valid bitmap building Author: Uwe L. Korn <uwelk@xhochy.com> Closes #338 from xhochy/ARROW-553 and squashes the following commits: 1c1ee3d [Uwe L. Korn] ARROW-553: C++: Faster valid bitmap building