bkietz commented on a change in pull request #9294:
URL: https://github.com/apache/arrow/pull/9294#discussion_r573252657
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File path: cpp/src/arrow/compute/function.h
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@@ -162,7 +162,15 @@ class ARROW_EXPORT Function {
///
/// NB: This function is overridden in CastFunction.
virtual Result<const Kernel*> DispatchExact(
- const std::vector<ValueDescr>& values) const = 0;
+ const std::vector<ValueDescr>& values) const;
+
+ /// \brief Return a best-match kernel that can execute the function given
the argument
+ /// types, after implicit casts are applied.
+ ///
+ /// \param[in,out] values Argument types. An element may be modified to
indicate that
+ /// the returned kernel only approximately matches the input value
descriptors; callers
+ /// are responsible for casting inputs to the type and shape required by the
kernel.
Review comment:
DispatchBest doesn't really compute this, actually. Instead it starts
from identity casts (== the same `ValueDescr`s which were input) and explores
allowed casts for a match.
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