move OrderPreservationRecursive declaration to hpp

Author: jeewonhh

src/execution/physical_plan/plan_insert.cpp

@@ -10,7 +10,7 @@
 
 namespace duckdb {
 
-static OrderPreservationType OrderPreservationRecursive(PhysicalOperator &op) {
+OrderPreservationType PhysicalPlanGenerator::OrderPreservationRecursive(PhysicalOperator &op) {
 	if (op.IsSource()) {
 		return op.SourceOrder();
 	}

src/include/duckdb/execution/physical_plan_generator.hpp

@@ -44,6 +44,9 @@ class PhysicalPlanGenerator {
 	static bool UseBatchIndex(ClientContext &context, PhysicalOperator &plan);
 	//! Whether or not we should preserve insertion order for executing the given sink
 	static bool PreserveInsertionOrder(ClientContext &context, PhysicalOperator &plan);
+	//! The order preservation type of the given operator decided by recursively looking at its children
+	static OrderPreservationType OrderPreservationRecursive(PhysicalOperator &op);
+
 
 protected:
 	unique_ptr<PhysicalOperator> CreatePlan(LogicalOperator &op);