vibhatha commented on code in PR #13397:
URL: https://github.com/apache/arrow/pull/13397#discussion_r902063056
##########
r/src/compute.cpp:
##########
@@ -574,3 +576,89 @@ SEXP compute__CallFunction(std::string func_name,
cpp11::list args, cpp11::list
std::vector<std::string> compute__GetFunctionNames() {
return arrow::compute::GetFunctionRegistry()->GetFunctionNames();
}
+
+class RScalarUDFCallable : public arrow::compute::ArrayKernelExec {
+ public:
+ RScalarUDFCallable(const std::shared_ptr<arrow::Schema>& input_types,
+ const std::shared_ptr<arrow::DataType>& output_type,
cpp11::sexp fun)
+ : input_types_(input_types), output_type_(output_type), fun_(fun) {}
+
+ arrow::Status operator()(arrow::compute::KernelContext* context,
+ const arrow::compute::ExecSpan& span,
+ arrow::compute::ExecResult* result) {
+ auto fun_result = SafeCallIntoR<std::shared_ptr<arrow::Array>>([&]() {
+ cpp11::writable::list args_sexp;
+ args_sexp.reserve(span.num_values());
+
+ for (int64_t i = 0; i < span.num_values(); i++) {
+ const arrow::compute::ExecValue& v = span[i];
+ if (v.is_array()) {
+ std::shared_ptr<arrow::Array> array = v.array.ToArray();
+ args_sexp.push_back(cpp11::to_r6<arrow::Array>(array));
+ } else if (v.is_scalar()) {
+ std::shared_ptr<const arrow::Scalar> scalar =
v.scalar->shared_from_this();
+ args_sexp.push_back(cpp11::to_r6<const arrow::Scalar>(scalar));
Review Comment:
```c++
std::shared_ptr<arrow::Scalar> scalar = v.scalar->Copy();
```
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