presto-main/src/main/java/io/prestosql/metadata/PolymorphicScalarFunctionBuilder.java/PolymorphicScalarFunctionBuilder/getExplicitNativeContainerTypes
class PolymorphicScalarFunctionBuilder:        List<Optional<Class<?>>> getExplicitNativeContainerTypes()
        {
            return explicitNativeContainerTypes;
        }