static bool
IsMemoryIntensiveOperator(Node *node, PlannedStmt *stmt)
{
	Assert(is_plan_node(node));
	switch(nodeTag(node))
	{
		case T_Material:
		case T_Sort:
		case T_ShareInputScan:
		case T_Hash:
		case T_BitmapIndexScan:
		case T_WindowAgg:
		case T_TableFunctionScan:
		case T_FunctionScan:
			return true;
		case T_Agg:
			{
				Agg *agg = (Agg *) node;
				return IsAggMemoryIntensive(agg);
			}
		case T_Result:
			{
				Result *res = (Result *) node;
				return IsResultMemoryIntensive(res);
			}
		default:
			return false;
	}
}