@Test
  public void test1() {
    EnvFactory.getEnv().getConfig().getCommonConfig().setMaxNumberOfPointsInPage(4);
    EnvFactory.getEnv().initClusterEnvironment();
    String[] expectedHeader = new String[] {TIMESTAMP_STR, count("root.sg1.d1.s1")};
    String[] retArray =
        new String[] {
          "1,3,", "4,1,", "7,3,", "10,3,",
        };

    prepareData(dataSet1);
    resultSetEqualTest(
        "select count(s1) from root.sg1.d1 group by ([1, 13), 3ms)", expectedHeader, retArray);
  }
This test contains one seq file and one unseq file. In the seq file, it contains two pages:
1,2,3,4 in one page, 8,10,11,12 in another page. In the unseq file, it only contains one page:
7, 9. The unseq page is overlapped with the second seq page.
integration-test/src/test/java/org/apache/iotdb/db/it/groupby/IoTDBGroupByUnseqIT.java