@Override
  public IFAState getInitialState() {
    return dfaGraph.getInitialState();
  }
Construct PatternDFA for given path pattern. Only used for authentication now.

@param prefixOrFullPatternTree the included PartialPath must be a prefix or a fullPath
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/path/fa/dfa/PatternDFA.java