@Test
  public void testArithmeticOperations() {
    String[] expectedHeader =
        new String[] {
          "_col0", "_col1", "_col2", "_col3", "_col4", "_col5",
        };
    String[] retArray =
        new String[] {
          "null,null,null,null,null,null,",
          "null,null,null,null,null,null,",
          "null,null,null,null,null,null,",
        };
    tableResultSetEqualTest(
        "select s1+s2, s1-s2, s1*s2, s1/s2, s1%s2, s2%s2 from sg1",
        expectedHeader, retArray, DATABASE_NAME);
  }
ArithmeticOperations: +, -, *, /, %

<p>The result will be NULL if any Operand of ArithmeticOperations is NULL.
integration-test/src/test/java/org/apache/iotdb/relational/it/query/old/query/IoTDBNullOperandTableIT.java