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

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