return derivedFeatures;
  }

  private static Set<Feature<?>> computeEntrySetFeatures(Set<Feature<?>> mapFeatures) {
    Set<Feature<?>> entrySetFeatures = computeCommonDerivedCollectionFeatures(mapFeatures);
    if (mapFeatures.contains(MapFeature.ALLOWS_NULL_ENTRY_QUERIES)) {
      entrySetFeatures.add(CollectionFeature.ALLOWS_NULL_QUERIES);
    }
    return entrySetFeatures;
  }