public static String unQualifyDatabaseName(String databaseName) {
    if (databaseName != null && databaseName.startsWith("root.")) {
      databaseName = databaseName.substring(5).toLowerCase();
    }
    return databaseName;
  }
Remove the back quotes of a measurement if necessary
iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/utils/PathUtils.java