paleolimbot commented on code in PR #13397:
URL: https://github.com/apache/arrow/pull/13397#discussion_r903760083
##########
r/src/compute.cpp:
##########
@@ -574,3 +576,154 @@ SEXP compute__CallFunction(std::string func_name,
cpp11::list args, cpp11::list
std::vector<std::string> compute__GetFunctionNames() {
return arrow::compute::GetFunctionRegistry()->GetFunctionNames();
}
+
+class RScalarUDFKernelState : public arrow::compute::KernelState {
+ public:
+ RScalarUDFKernelState(cpp11::sexp exec_func, cpp11::sexp resolver)
+ : exec_func_(exec_func), resolver_(resolver) {}
+
+ cpp11::function exec_func_;
+ cpp11::function resolver_;
+};
+
+class RScalarUDFOutputTypeResolver : public
arrow::compute::OutputType::Resolver {
+ public:
+ arrow::Result<arrow::ValueDescr> operator()(
+ arrow::compute::KernelContext* context,
+ const std::vector<arrow::ValueDescr>& descr) {
+ return SafeCallIntoR<arrow::ValueDescr>([&]() -> arrow::ValueDescr {
+ auto kernel =
+ reinterpret_cast<const
arrow::compute::ScalarKernel*>(context->kernel());
+ auto state =
std::dynamic_pointer_cast<RScalarUDFKernelState>(kernel->data);
+
+ cpp11::writable::list input_types_sexp;
+ input_types_sexp.reserve(descr.size());
+ for (const auto& item : descr) {
+ input_types_sexp.push_back(cpp11::to_r6<arrow::DataType>(item.type));
+ }
Review Comment:
Good call! I updated another place where this was the case as well.
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