public static <K, V, T extends Comparable<? super T>> AbstractGroupExpression<Pair<K, V>, SortedSetMultimap<T, V>> sortedSetMultimap(GroupExpression<K, T> key,
                                                                                                                                         Expression<V> value) {
        return sortedSetMultimap(key, (GroupExpression) new GOne<V>(value));
    }
Create a new aggregating map expression using a backing TreeMap

@param key key for the map entries
@param value value for the map entries
@return wrapper expression
querydsl-guava/src/main/java/com/querydsl/core/group/guava/GuavaGroupBy.java