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David LiAntoine Pitrou
bb776d8984a
David Li authored and Antoine Pitrou committed 575a4376bb0
ARROW-14167: [C++][R] Directly support dictionaries in coalesce

This was omitted from ARROW-13390. Note that even after this, there's work for ARROW-14105 to unify the type promotion rules and make them apply to dictionary indices/values as well. Contains some changes from ARROW-13358 and also updates case_when's promotion rules a bit.

Closes #11272 from lidavidm/arrow-14167

Lead-authored-by: David Li <li.davidm96@gmail.com>
Co-authored-by: Ian Cook <ianmcook@gmail.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>