Function check_functions_in_node

src/backend/nodes/nodeFuncs.c:1779–1867

* check_functions_in_node - * apply checker() to each function OID contained in given expression node * * Returns true if the checker() function does; for nodes representing more * than one function call, returns true if the checker() function does so * for any of those functions. Returns false if node does not invoke any * SQL-visible function. Caller must not pass node == NULL. * * T

 * thought about how to treat them.
 */
bool
check_functions_in_node(Node *node, check_function_callback checker,
						void *context)
{
	switch (nodeTag(node))
	{
		case T_Aggref:
			{
				Aggref	   *expr = (Aggref *) node;

				if (checker(expr->aggfnoid, context))
					return true;
			}
			break;
		case T_WindowFunc:
			{
				WindowFunc *expr = (WindowFunc *) node;

				if (checker(expr->winfnoid, context))
					return true;
			}
			break;
		case T_FuncExpr:
			{
				FuncExpr   *expr = (FuncExpr *) node;

				if (checker(expr->funcid, context))
					return true;
			}
			break;
		case T_OpExpr:
		case T_DistinctExpr:	/* struct-equivalent to OpExpr */
		case T_NullIfExpr:		/* struct-equivalent to OpExpr */
			{
				OpExpr	   *expr = (OpExpr *) node;

				/* Set opfuncid if it wasn't set already */
				set_opfuncid(expr);
				if (checker(expr->opfuncid, context))
					return true;
			}
			break;
		case T_ScalarArrayOpExpr:
			{
				ScalarArrayOpExpr *expr = (ScalarArrayOpExpr *) node;

				set_sa_opfuncid(expr);
				if (checker(expr->opfuncid, context))
					return true;
			}
			break;
		case T_CoerceViaIO:
			{
				CoerceViaIO *expr = (CoerceViaIO *) node;
				Oid			iofunc;
				Oid			typioparam;
				bool		typisvarlena;