mapleFU commented on issue #37840:
URL: https://github.com/apache/arrow/issues/37840#issuecomment-1733215867
Oops, let me have a try with master, I've check some `CountRows` and `Scan`
code in master but at first glance they should works well.
I've test that the result status of `Scan` is failed like above:
```
Result<const Kernel*> CastFunction::DispatchExact(
const std::vector<TypeHolder>& types) const {
RETURN_NOT_OK(CheckArity(types.size()));
std::vector<const ScalarKernel*> candidate_kernels;
for (const auto& kernel : kernels_) {
if (kernel.signature->MatchesInputs(types)) {
candidate_kernels.push_back(&kernel);
}
}
if (candidate_kernels.size() == 0) {
return Status::NotImplemented("Unsupported cast from ",
types[0].type->ToString(),
" to ", ToTypeName(out_type_id_), " using
function ",
this->name());
}
```
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