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Posted to issues@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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