code: @Override
    public boolean adjustEntry(MkAppEntry entry, DBID routingObjectID, double parentDistance, AbstractMTree<O, MkAppTreeNode<O>, MkAppEntry, ?> mTree) {
      super.adjustEntry(entry, routingObjectID, parentDistance, mTree);
      // entry.setKnnDistanceApproximation(knnDistanceApproximation());
      return true; // TODO: improve
    }
docs: Adjusts the parameters of the entry representing this node.
  
  @param entry the entry representing this node
  @param routingObjectID the id of the (new) routing object of this node
  @param parentDistance the distance from the routing object of this node to
  the routing object of the parent node
  @param mTree the M-Tree object holding this node