bkietz commented on a change in pull request #9294:
URL: https://github.com/apache/arrow/pull/9294#discussion_r566366948
##########
File path: cpp/src/arrow/compute/kernels/scalar_arithmetic.cc
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@@ -264,10 +264,31 @@ ArrayKernelExec NumericEqualTypesBinary(detail::GetTypeId
get_id) {
}
}
+struct ArithmeticFunction : ScalarFunction {
+ using ScalarFunction::ScalarFunction;
+
+ Result<const Kernel*> DispatchBest(std::vector<ValueDescr>* values) const
override {
Review comment:
By default, DispatchBest is just an alias of DispatchExact. It must be
overridden to specify allowed implicit casts. For example here I'm overriding
it to allow arithmetic between numeric types (converting to the common numeric
type).
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