Function ExecIsExprUnsafeToConst_walker

src/backend/executor/execExpr.c:4359–4388

* ExecIsExprUnsafeToConst_walker * * Almost all of the expressions are not allowed without the executor. * Returns true as soon as possible we find such unsafe nodes. */

 * Returns true as soon as possible we find such unsafe nodes.
 */
static bool
ExecIsExprUnsafeToConst_walker(Node *node, void *context)
{
	switch(nodeTag(node))
	{
		/*
		 * Param can be a Const in some situation, but the demanded use case
		 * so far doesn't want it.
		 */
		case T_Const:
		case T_CaseTestExpr:
		case T_FuncExpr:
		case T_OpExpr:
		case T_DistinctExpr:
		case T_ScalarArrayOpExpr:
		case T_BoolExpr:
		case T_CaseExpr:
		case T_CoalesceExpr:
		case T_MinMaxExpr:
		case T_NullIfExpr:
		case T_NullTest:
		case T_BooleanTest:
		case T_List:
		case T_TypeCast:
			return false;

		default:
			return true;
	}
}

/*
 * ExecIsExprUnsafeToConst