First version

src/include/utils/helpers.hpp

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+#pragma once
+
+#include <duckdb.hpp>
+
+namespace duckdb {
+
+struct RunOnceTableFunctionState : GlobalTableFunctionState {
+	RunOnceTableFunctionState() : run(false) {};
+	std::atomic<bool> run;
+
+	static unique_ptr<GlobalTableFunctionState> Init(ClientContext &,
+																TableFunctionInitInput &) {
+		return make_uniq<RunOnceTableFunctionState>();
+	}
+};
+
+template <typename T>
+T GetSetting(const ClientContext &context, const char *setting_name, const T default_value) {
+	Value value;
+	return context.TryGetCurrentSetting(setting_name, value) ? value.GetValue<T>() : default_value;
+}
+
+bool ShouldRun(TableFunctionInput &input);
+
+void RegisterTF(DatabaseInstance &instance, const char* name, table_function_t func);
+
+} // namespace duckdb