presto-main/src/main/java/io/prestosql/operator/scalar/annotations/ParametricScalarImplementation.java/Parser/getSpecializedSignature
class Parser:        public SpecializedSignature getSpecializedSignature()
        {
            return new SpecializedSignature(
                    getSignature(),
                    argumentNativeContainerTypes,
                    specializedTypeParameters,
                    returnNativeContainerType);
        }