public static String[] buildHeaders(int length) {
    String[] expectedHeader = new String[length];
    for (int i = 0; i < length; i++) {
      expectedHeader[i] = "_col" + i;
    }
    return expectedHeader;
  }
In this IT, table has more than one TAGs and Attributes.
integration-test/src/test/java/org/apache/iotdb/relational/it/db/it/IoTDBMultiTAGsWithAttributesTableIT.java