@Override
    protected Iterator<IFATransition> getPreNodeFuzzyMatchTransitionIterator() {
      if (tracebackNode == null) {
        return Collections.emptyIterator();
      } else {
        return new SingletonIterator<>(tracebackNode);
      }
    }
The patternNode of the rawNode which is a specified name.
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/path/fa/nfa/SimpleNFA.java