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[jira] [Created] (ARROW-4119) [C++] Clean up cast implementation from null to other types


Wes McKinney created ARROW-4119:
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             Summary: [C++] Clean up cast implementation from null to other types
                 Key: ARROW-4119
                 URL: https://issues.apache.org/jira/browse/ARROW-4119
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney
             Fix For: 0.13.0


We are currently generating a bunch of empty kernels when there is no need. It would be better to define a clean {{NullCastKernel}} that handles ensuring that appropriate buffers have been constructed for the output all-null array



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