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Posted to dev@arrow.apache.org by "Wes McKinney (Jira)" <ji...@apache.org> on 2020/05/24 13:10:00 UTC

[jira] [Created] (ARROW-8919) [C++] Add "DispatchBest" APIs to compute::Function that selects a kernel that may require implicit casts to invoke

Wes McKinney created ARROW-8919:
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             Summary: [C++] Add "DispatchBest" APIs to compute::Function that selects a kernel that may require implicit casts to invoke
                 Key: ARROW-8919
                 URL: https://issues.apache.org/jira/browse/ARROW-8919
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Wes McKinney
             Fix For: 1.0.0


Currently we have "DispatchExact" which requires an exact match of input types. "DispatchBest" would permit kernel selection with implicit casts required. Since multiple kernels may be valid when allowing implicit casts, we will need to break ties by estimating the "cost" of the implicit casts. For example, casting int8 to int32 is "less expensive" than implicitly casting to int64



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