Function is_notclause

src/include/nodes/nodeFuncs.h:114–120

Is clause a NOT clause? */

/* Is clause a NOT clause? */
static inline bool
is_notclause(const void *clause)
{
	return (clause != NULL &&
			IsA(clause, BoolExpr) &&
			((const BoolExpr *) clause)->boolop == NOT_EXPR);
}

/* Extract argument from a clause known to be a NOT clause */
static inline Expr *