public Map<String, Long> getAllPathTTL() {
    Map<String, Long> result = new HashMap<>();
    for (Map.Entry<String[], Long> entry : getAllTTLs().entrySet()) {
      result.put(
          String.join(String.valueOf(IoTDBConstant.PATH_SEPARATOR), entry.getKey()),
          entry.getValue());
    }
    return result;
  }
@return key is path contains wildcard between each node
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/schema/ttl/TTLCache.java