DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a INT, b CHAR(8), pk INT AUTO_INCREMENT PRIMARY KEY) ENGINE=xengine;
INSERT INTO t1 (a,b) VALUES (1,'a'),(2,'b'),(3,'c'),(4,'d'),(5,'e'),(10000,'foobar');
INSERT INTO t1 (a,b) SELECT a, b FROM t1;
UPDATE t1 SET a=a+100;
SELECT a,b FROM t1;
a	b
101	a
101	a
10100	foobar
10100	foobar
102	b
102	b
103	c
103	c
104	d
104	d
105	e
105	e
UPDATE t1 SET a=a-100, b=DEFAULT WHERE a>100;
SELECT a,b FROM t1;
a	b
1	NULL
1	NULL
10000	NULL
10000	NULL
2	NULL
2	NULL
3	NULL
3	NULL
4	NULL
4	NULL
5	NULL
5	NULL
UPDATE t1 SET b = 'update' WHERE a <= 4 ORDER BY b DESC, a ASC LIMIT 1;
SELECT a,b FROM t1;
a	b
1	NULL
1	update
10000	NULL
10000	NULL
2	NULL
2	NULL
3	NULL
3	NULL
4	NULL
4	NULL
5	NULL
5	NULL
DROP TABLE t1;
CREATE TABLE t1 (a INT, b CHAR(8), pk INT AUTO_INCREMENT PRIMARY KEY) ENGINE=xengine;
INSERT INTO t1 (a,b) VALUES (1,'a'),(2,'b'),(3,'c'),(4,'d'),(5,'e'),(10000,'foobar');
INSERT INTO t1 (a,b) SELECT a, b FROM t1;
BEGIN;
UPDATE t1 SET a=a+100;
UPDATE t1 SET a=a-50, b=DEFAULT WHERE a>100;
COMMIT;
SELECT * FROM t1 ORDER BY pk;
a	b	pk
10050	NULL	12
10050	NULL	6
51	NULL	1
51	NULL	7
52	NULL	2
52	NULL	8
53	NULL	3
53	NULL	9
54	NULL	10
54	NULL	4
55	NULL	11
55	NULL	5
BEGIN;
UPDATE t1 SET b = 'update' WHERE a <= 4 ORDER BY a DESC, b ASC LIMIT 3;
UPDATE t1 SET b = '';
ROLLBACK;
SELECT * FROM t1 ORDER BY pk;
a	b	pk
51	NULL	1
52	NULL	2
53	NULL	3
54	NULL	4
55	NULL	5
10050	NULL	6
51	NULL	7
52	NULL	8
53	NULL	9
54	NULL	10
55	NULL	11
10050	NULL	12
BEGIN;
UPDATE t1 SET b = 'update2' WHERE a <= 100;
SAVEPOINT spt1;
UPDATE t1 SET b = '';
ROLLBACK TO SAVEPOINT spt1;
ERROR HY000: XEngine currently does not support ROLLBACK TO SAVEPOINT if modifying rows.
UPDATE t1 SET b = 'upd' WHERE a = 10050;
ERROR HY000: This transaction was rolled back and cannot be committed. Only supported operation is to roll it back, so all pending changes will be discarded. Please restart another transaction.
ROLLBACK;
SELECT * FROM t1 ORDER BY pk;
a	b	pk
51	NULL	1
52	NULL	2
53	NULL	3
54	NULL	4
55	NULL	5
10050	NULL	6
51	NULL	7
52	NULL	8
53	NULL	9
54	NULL	10
55	NULL	11
10050	NULL	12
DROP TABLE t1;