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https://issues.apache.org/jira/browse/ARROW-8919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ben Kietzman reassigned ARROW-8919:
-----------------------------------
Assignee: Ben Kietzman
> [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
> Assignee: Ben Kietzman
> Priority: Major
> Fix For: 4.0.0
>
>
> 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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