Inconsistent behavior of DELETE IGNORE and FK constraint

PBXT reports error when FK constraint fails and DELETE IGNORE is used, but deletes one of rows which should not be deleted.

How to repeat:

mysql> create table parent (id int primary key) engine = pbxt;
Query OK, 0 rows affected (0.16 sec)

mysql> create table child (id int PRIMARY KEY, FOREIGN KEY (id) REFERENCES parent(id))
engine =pbxt;
Query OK, 0 rows affected (0.19 sec)

mysql> insert into parent values (1), (2), (3), (4), (5), (6);
Query OK, 6 rows affected (0.09 sec)
Records: 6 Duplicates: 0 Warnings: 0

mysql> insert into child values (3), (5);
Query OK, 2 rows affected (0.08 sec)
Records: 2 Duplicates: 0 Warnings: 0

mysql> insert into child values (7);
ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails
(Constraint: `FOREIGN_1`)
mysql> delete ignore from parent;
Query OK, 2 rows affected, 1 warning (0.11 sec)

mysql> show warnings;
+-------+------+--------------------------------------------------------------------------
----------------------+
| Level | Code | Message
                     |
+-------+------+--------------------------------------------------------------------------
----------------------+
| Error | 1451 | Cannot delete or update a parent row: a foreign key constraint fails
(Constraint: `FOREIGN_1`) |
+-------+------+--------------------------------------------------------------------------
----------------------+
1 row in set (0.00 sec)

mysql> select row_count();
+-------------+
| row_count() |
+-------------+
| -1 |
+-------------+
1 row in set (0.00 sec)

mysql> select * from parent;
+----+
| id |
+----+
| 4 |
| 5 |
| 6 |
+----+
3 rows in set (0.00 sec)

See also http://bugs.mysql.com/bug.php?id=44987