@BeforeClass
  public static void setUp() throws Exception {
    EnvFactory.getEnv().getConfig().getCommonConfig().setSortBufferSize(128 * 1024);
    EnvFactory.getEnv().getConfig().getCommonConfig().setMaxTsBlockSizeInByte(4 * 1024);
    EnvFactory.getEnv().initClusterEnvironment();
    prepareTableData(createSqls);
  }
In this Class, we construct the scenario using DistinctAccumulator for
AggregationFunctionDistinct. Other cases are covered by {@link IoTDBTableAggregationIT}.
integration-test/src/test/java/org/apache/iotdb/relational/it/query/recent/IoTDBTableAggregationFunctionDistinctIT.java