hi,
  I tried this in mysql 5.1.22:

mysql> create table t( value binary(16)) engine=innodb;
Query OK, 0 rows affected (0.00 sec)

mysql> insert into t values( NULL );
Query OK, 1 row affected (0.00 sec)

mysql> checksum table t;
+-------+------------+
| Table | Checksum   |
+-------+------------+
| IM.t  | 2777151533 |
+-------+------------+
1 row in set (0.00 sec)

In mysql 5.1.32, however:

mysql> create table t( value binary(16)) engine=innodb;
Query OK, 0 rows affected (0.01 sec)

mysql> insert into t values(NULL);
Query OK, 1 row affected (0.00 sec)

mysql> checksum table t;
+-------+------------+
| Table | Checksum   |
+-------+------------+
| IM.t  | 3512059891 |
+-------+------------+
1 row in set (0.00 sec)


  Any ideas?
  Thank you

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