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Shoichi KagawaSutou Kouhei
b747e2c8413
Shoichi Kagawa authored and Sutou Kouhei committed 1248228e9d5
ARROW-13629: [Ruby] Add support for building/converting map

Closes #10937 from kanga333/ruby-support-maptype

Lead-authored-by: Shoichi Kagawa <e411z7t40w@gmail.com>
Co-authored-by: kanga333 <e411z7t40w@gmail.com>
Co-authored-by: Sutou Kouhei <kou@cozmixng.org>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>