Assert.assertTrue(t.getColumnLength(0) == 1);
t.addAttribute("b");
Assert.assertTrue(t.getColumnLength(1) == 1);
t.addAttribute("aasdfasd|fasdf");
Assert.assertTrue(t.getColumnLength(2) == 14);
String tupleStr = "attr1|attr2|3|4|attr5|";
int[] offsets = {0,6,12,14,16,22};
t = new Tuple(tupleStr.getBytes(),offsets,5);