redundant 行记录格式

CREATE TABLE `mytest2` (
  `t1` varchar() DEFAULT NULL,
  `t2` varchar() DEFAULT NULL,
  `t3` char() DEFAULT NULL,
  `t4` varchar() DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 ROW_FORMAT=REDUNDANT

mysql> select * from mytest2;
+------+------+------+------+
| t1   | t2   | t3   | t4   |
+------+------+------+------+
| a    | bb   | bb   | ccc  |
| d    | ee   | ee   | fff  |
| d    | NULL | NULL | fff  |
+------+------+------+------+

mysql> select hex(t1),hex(t2),hex(t3),hex(t4) from mytest2;
+---------+---------+---------+---------+
| hex(t1) | hex(t2) | hex(t3) | hex(t4) |
+---------+---------+---------+---------+
|       |     |     |   |
|       |     |     |   |
|       | NULL    | NULL    |   |
+---------+---------+---------+---------+
 rows in set (0.00 sec)