presto-main/src/main/java/io/prestosql/operator/scalar/annotations/ParametricScalarImplementation.java/ParametricScalarImplementation/equals
class ParametricScalarImplementation:        @Override
        public boolean equals(Object o)
        {
            if (this == o) {
                return true;
            }
            if (o == null || getClass() != o.getClass()) {
                return false;
            }
            SpecializedSignature that = (SpecializedSignature) o;
            return Objects.equals(signature, that.signature) &&
                    Objects.equals(argumentNativeContainerTypes, that.argumentNativeContainerTypes) &&
                    Objects.equals(specializedTypeParameters, that.specializedTypeParameters) &&
                    Objects.equals(returnNativeContainerType, that.returnNativeContainerType);
        }