public List<KuduPredicate> convert(ScalarOperator operator) {
        if (operator == null) {
            return null;
        }
        return operator.accept(this, null);
    }
@Test
    public void testIn() {
        ConstantOperator value = ConstantOperator.createInt(5);
        ConstantOperator value1 = ConstantOperator.createInt(6);
        ConstantOperator value2 = ConstantOperator.createInt(7);
        ScalarOperator op = new InPredicateOperator(false, F0, value, value1, value2);
        List<KuduPredicate> result = CONVERTER.convert(op);
        Assert.assertEquals(result.get(0).toString(), "`f0` IN (5, 6, 7)");
    }