message: Add Vlist's cache
  Add a function to load Vlist's cache
diff: @@ -88,6 +88,7 @@ public:
  void resetStream();
  bool range_query(unsigned _key1, unsigned _key2);
  bool save();
  + void AddIntoCache(TYPE_ENTITY_LITERAL_ID _id);
  ~IVTree();
  void print(std::string s); //DEBUG(print the tree)
  };
  