nanobind: UDF kind via enum .name; TryConvert clears PyErr

Author: evertlammerts

src/duckdb_py/python_udf.cpp

@@ -502,7 +502,7 @@ struct PythonUDFData {
 			if (DuckDBPyType::TryConvert(py::borrow<py::object>(value.attr("annotation")), pytype)) {
 				parameters.push_back(pytype->Type());
 			} else {
-				std::string kind = py::cast<std::string>(py::str(value.attr("kind")));
+				std::string kind = py::cast<std::string>(value.attr("kind").attr("name"));
 				auto parameter_kind = ParameterKind::FromString(kind);
 				if (parameter_kind == ParameterKind::Type::VAR_POSITIONAL) {
 					varargs = LogicalType::ANY;

src/duckdb_py/typing/pytype.cpp

@@ -340,6 +340,9 @@ bool DuckDBPyType::TryConvert(const py::object &object, std::shared_ptr<DuckDBPy
 		result = py::cast<std::shared_ptr<DuckDBPyType>>(converted);
 		return true;
 	} catch (...) {
+		// A failed construction (e.g. an unannotated parameter) leaves the Python error indicator set; clear it
+		// so the caller's subsequent Python operations don't trip on a stale error.
+		PyErr_Clear();
 		return false;
 	}
 }