presto-main/src/main/java/io/prestosql/util/FastutilSetHelper.java/FastutilSetHelper/ObjectStrategy
class FastutilSetHelper:        private ObjectStrategy(Metadata metadata, Type type)
        {
            hashCodeHandle = metadata.getScalarFunctionImplementation(metadata.resolveOperator(HASH_CODE, ImmutableList.of(type)))
                    .getMethodHandle()
                    .asType(MethodType.methodType(long.class, Object.class));
            equalsHandle = metadata.getScalarFunctionImplementation(metadata.resolveOperator(EQUAL, ImmutableList.of(type, type)))
                    .getMethodHandle()
                    .asType(MethodType.methodType(Boolean.class, Object.class, Object.class));
        }