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[jira] [Created] (ARROW-4110) [C++] Do not generate distinct cast kernels when input and output type are the same


Wes McKinney created ARROW-4110:
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             Summary: [C++] Do not generate distinct cast kernels when input and output type are the same
                 Key: ARROW-4110
                 URL: https://issues.apache.org/jira/browse/ARROW-4110
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney
             Fix For: 0.13.0


I side issue brought up by ARROW-4101 and ARROW-4102 is that the "identity cast" is handled on a type-by-type basis. We should see if we can have a "universal identity cast" and simplify things



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