@Before
  public void setUp() throws MetadataException, IOException, WriteProcessException {
    dataNodeId = IoTDBDescriptor.getInstance().getConfig().getDataNodeId();
    maxTsBlockLineNumber = TSFileDescriptor.getInstance().getConfig().getMaxTsBlockLineNumber();
    IoTDBDescriptor.getInstance().getConfig().setDataNodeId(0);
    TSFileDescriptor.getInstance().getConfig().setMaxTsBlockLineNumber(3);
    SeriesReaderTestUtil.setUp(
        measurementSchemas, deviceIds, seqResources, unSeqResources, TOP_K_OPERATOR_TEST_SG);
  }
The original data and structure of this test is same as {@link MergeTreeSortOperatorTest}.
iotdb-core/datanode/src/test/java/org/apache/iotdb/db/queryengine/execution/operator/TreeTopKOperatorTest.java