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Antoine PitrouWes McKinney
8de9295f647
Antoine Pitrou authored and Wes McKinney committed aaec0d46c56
ARROW-7011: [C++] Implement casts from float/double to decimal

Also naturally available in Python using the Array.cast() method.

Closes #7612 from pitrou/ARROW-7011-cast-float-to-decimal

Lead-authored-by: Antoine Pitrou <antoine@python.org>
Co-authored-by: Wes McKinney <wesm@apache.org>
Signed-off-by: Wes McKinney <wesm@apache.org>