presto-main/src/main/java/io/prestosql/operator/scalar/annotations/ParametricScalarImplementation.java/ParametricScalarImplementation/checkDependencies
class ParametricScalarImplementation:        public boolean checkDependencies()
        {
            for (int i = 1; i < getDependencies().size(); i++) {
                if (!getDependencies().get(i).equals(getDependencies().get(0))) {
                    return false;
                }
            }
            return true;
        }