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Antoine Pitrou authored and Wes McKinney committed 31c7a50a2e4
ARROW-8568: [C++] Fix decimal to decimal cast issues - Allow same-scale casts - Detect truncation when target precision is too small Closes #7178 from pitrou/ARROW-8568-decimal-cast-same-scale Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Wes McKinney <wesm@apache.org>