@Test
  public void testEmptyTopKOperator() throws Exception {
    TreeTopKOperator topKOperator = emptyTopKOperatorTest(Ordering.ASC, Ordering.ASC, limitValue);
    while (topKOperator.isBlocked().isDone() && topKOperator.hasNext()) {
      TsBlock tsBlock = topKOperator.next();
      if (tsBlock == null || tsBlock.isEmpty()) {
        continue;
      }
      fail();
    }
  }
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