Comment 3 for bug 314570

So here's a little more info about this bug:

The insert query succeeds on the second attempt (after the failure) as seen below.

---------

drizzle> use test
Database changed

drizzle> create table t1 (a int not null auto_increment primary key, val int) engine=innodb;
Query OK, 0 rows affected (0.01 sec)

drizzle> insert into t1 (val) values (1);
Query OK, 1 row affected (0.01 sec)

drizzle> update t1 set a=2 where a=1;
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0

drizzle> insert into t1 (val) values (1);
ERROR 1062 (23000): Duplicate entry '2' for key 'PRIMARY'

drizzle> insert into t1 (val) values (1);
Query OK, 1 row affected (0.01 sec)

drizzle> select * from t1;
+---+------+
| a | val |
+---+------+
| 2 | 1 |
| 3 | 1 |
+---+------+
2 rows in set (0.00 sec)