@Override
  public String getName() {
    return TransformFunctionType.NOT.getName();
  }
@Test
  public void testNotNullLiteral() {
    ExpressionContext expression = RequestContextUtils.getExpression(String.format("Not(null)", INT_SV_NULL_COLUMN));
    TransformFunction transformFunction = TransformFunctionFactory.get(expression, _dataSourceMap);
    Assert.assertTrue(transformFunction instanceof NotOperatorTransformFunction);
    Assert.assertEquals(transformFunction.getName(), "not");
    int[] expectedValues = new int[NUM_ROWS];
    RoaringBitmap roaringBitmap = new RoaringBitmap();
    roaringBitmap.add(0L, NUM_ROWS);
    testTransformFunctionWithNull(transformFunction, expectedValues, roaringBitmap);
  }