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Wes McKinneyUwe L. Korn
5904eea4cc2
Wes McKinney authored and Uwe L. Korn committed a536529a624
ARROW-4102: [C++] Return common IdentityCast when casting to equal type

I also added some code to make it easier to write cast tests in JSON.

As one issue with the JSON parser -- we have a number of tests in cast-test.cc that check that values that are in null positions are ignored. We might augment the parser to be able to pass both values and validity bitmap as separate JSON strings

Author: Wes McKinney <wesm+git@apache.org>

Closes #3265 from wesm/ARROW-4102 and squashes the following commits:

8c27ba2a <Wes McKinney> Fix bad memory access
9c52297f <Wes McKinney> Add various identity cast tests, verify that fixed_size_binary identity casts work now