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François Saint-Jacques authored and Wes McKinney committed dd896c908e0
ARROW-3613: [Go] Fix builder downsize Downsizing is not updating the null counts. Author: François Saint-Jacques <fsaintjacques@gmail.com> Closes #3048 from fsaintjacques/ARROW-3613-go-builder-downsize and squashes the following commits: ddc43d481 <François Saint-Jacques> ARROW-3613: Fix builder downsize