@Test
public void differentColumns() {

    ConditionExpression firstNameLtJoe = compare(firstName, Comparison.LT, constant("joe"));
    ConditionExpression lastNameLtSmith = compare(lastName, Comparison.LT, constant("smith"));
    ConditionExpression either = or(firstNameLtJoe, lastNameLtSmith);
    ColumnRanges expected = null;
    assertEquals(expected, ColumnRanges.rangeAtNode(either));
}