@Override
    protected void close() {
      super.close();
      if (iterator != null) {
        releaseNodeIterator(iterator);
      }
    }
Try to get next matched state from sourceState and add it into currentStateMatchInfo

@param child child node to match
@param sourceState source state
@param currentStateMatchInfo currentStateMatchInfo
@return iterator of rest transitions
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/schema/tree/AbstractTreeVisitor.java