CREATE TABLE t1 (a INT);

INSERT INTO t1 VALUES (1),(2);

CREATE TABLE t2 (b INT);

INSERT INTO t2 VALUES (3),(4);

CREATE TABLE t3 (c INT PRIMARY KEY) ENGINE=HEAP;

SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON (t2.b >= t3.c) ON (t1.a < t2.b);

SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON (t2.b >= t3.c) ON (t1.a < t2.b);

a	b	c

EXPLAIN EXTENDED

SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON (t2.b >= t3.c) ON (t1.a < t2.b);

id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra

1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables

Warnings:

Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`c` AS `c` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(`test`.`t1`.`a` < `test`.`t2`.`b` and `test`.`t2`.`b` >= `test`.`t3`.`c`) where 1

SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON (t2.b >= t3.c) ON (t1.a < t2.b);

a	b	c

1	NULL	NULL

2	NULL	NULL

EXPLAIN EXTENDED

SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON (t2.b >= t3.c) ON (t1.a < t2.b);

id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra

1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	

1	SIMPLE	t3	ALL	PRIMARY	NULL	NULL	NULL	0	0.00	Using join buffer (flat, BNL join)

1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer (incremental, BNL join)

Warnings:

Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`c` AS `c` from `test`.`t1` left join (`test`.`t2` join `test`.`t3`) on(`test`.`t1`.`a` < `test`.`t2`.`b` and `test`.`t2`.`b` >= `test`.`t3`.`c`) where 1