private String convertNodesToString(List<String> nodes) {
    StringBuilder fullPathBuilder = new StringBuilder(nodes.get(0));
    for (int i = 1; i < nodes.size(); i++) {
      fullPathBuilder.append(TsFileConstant.PATH_SEPARATOR).append(nodes.get(i));
    }
    return fullPathBuilder.toString();
  }
Construct tree according to the pathPatternList.
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/path/PathPatternTree.java