@Override
    protected Map<String, IFATransition> getPreNodePreciseMatchTransition() {
      if (preNodePreciseMatchTransitionMap == null) {
        preNodePreciseMatchTransitionMap =
            Collections.singletonMap(pathPattern.getNodes()[patternIndex], this);
      }
      return preNodePreciseMatchTransitionMap;
    }
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