Commits
Sutou Kouhei authored d4db474072f
ARROW-8140: [Dev] Follow class name change NullType was renamed to NullField by 963ac4f330f8dba27672f091eb4706f24707a876. Closes #6649 from kou/archery-use-null-field Authored-by: Sutou Kouhei <kou@clear-code.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>