join_nested.test, join_nested.result:

  new file
Many files:
  Nested joins added.

1 files changed, 1161 insertions, 0 deletions

diff --git a/mysql-test/r/join_nested.result b/mysql-test/r/join_nested.result
new file mode 100644
index 00000000000..d9edc841925
--- /dev/null
+++ b/mysql-test/r/join_nested.result
@@ -0,0 +1,1161 @@
+DROP TABLE IF EXISTS t0,t1,t2,t3,t4,t5,t6,t7,t8,t9;
+Warnings:
+Note	1051	Unknown table 't0'
+Note	1051	Unknown table 't1'
+Note	1051	Unknown table 't2'
+Note	1051	Unknown table 't3'
+Note	1051	Unknown table 't4'
+Note	1051	Unknown table 't5'
+Note	1051	Unknown table 't6'
+Note	1051	Unknown table 't7'
+Note	1051	Unknown table 't8'
+Note	1051	Unknown table 't9'
+CREATE TABLE t0 (a int, b int, c int);
+CREATE TABLE t1 (a int, b int, c int);
+CREATE TABLE t2 (a int, b int, c int);
+CREATE TABLE t3 (a int, b int, c int);
+CREATE TABLE t4 (a int, b int, c int);
+CREATE TABLE t5 (a int, b int, c int);
+CREATE TABLE t6 (a int, b int, c int);
+CREATE TABLE t7 (a int, b int, c int);
+CREATE TABLE t8 (a int, b int, c int);
+CREATE TABLE t9 (a int, b int, c int);
+INSERT INTO t0 VALUES (1,1,0), (1,2,0), (2,2,0);
+INSERT INTO t1 VALUES (1,3,0), (2,2,0), (3,2,0);
+INSERT INTO t2 VALUES (3,3,0), (4,2,0), (5,3,0);
+INSERT INTO t3 VALUES (1,2,0), (2,2,0);
+INSERT INTO t4 VALUES (3,2,0), (4,2,0);
+INSERT INTO t5 VALUES (3,1,0), (2,2,0), (3,3,0);
+INSERT INTO t6 VALUES (3,2,0), (6,2,0), (6,1,0);
+INSERT INTO t7 VALUES (1,1,0), (2,2,0);
+INSERT INTO t8 VALUES (0,2,0), (1,2,0);
+INSERT INTO t9 VALUES (1,1,0), (1,2,0), (3,3,0);
+SELECT t2.a,t2.b
+FROM t2;
+a	b
+3	3
+4	2
+5	3
+SELECT t3.a,t3.b
+FROM t3;
+a	b
+1	2
+2	2
+SELECT t4.a,t4.b
+FROM t4;
+a	b
+3	2
+4	2
+SELECT t3.a,t3.b,t4.a,t4.b
+FROM t3,t4;
+a	b	a	b
+1	2	3	2
+2	2	3	2
+1	2	4	2
+2	2	4	2
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t2.b=t4.b;
+a	b	a	b	a	b
+3	3	NULL	NULL	NULL	NULL
+4	2	1	2	3	2
+4	2	1	2	4	2
+4	2	2	2	3	2
+4	2	2	2	4	2
+5	3	NULL	NULL	NULL	NULL
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b;
+a	b	a	b	a	b
+3	3	NULL	NULL	NULL	NULL
+4	2	1	2	3	2
+4	2	1	2	4	2
+5	3	NULL	NULL	NULL	NULL
+EXPLAIN
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t2.b=t4.b
+WHERE t3.a=1 OR t3.c IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t2.b=t4.b
+WHERE t3.a=1 OR t3.c IS NULL;
+a	b	a	b	a	b
+3	3	NULL	NULL	NULL	NULL
+4	2	1	2	3	2
+4	2	1	2	4	2
+5	3	NULL	NULL	NULL	NULL
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t2.b=t4.b
+WHERE t3.a>1 OR t3.c IS NULL;
+a	b	a	b	a	b
+3	3	NULL	NULL	NULL	NULL
+4	2	2	2	3	2
+4	2	2	2	4	2
+5	3	NULL	NULL	NULL	NULL
+SELECT t5.a,t5.b
+FROM t5;
+a	b
+3	1
+2	2
+3	3
+SELECT t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
+FROM t3,t4,t5;
+a	b	a	b	a	b
+1	2	3	2	3	1
+2	2	3	2	3	1
+1	2	4	2	3	1
+2	2	4	2	3	1
+1	2	3	2	2	2
+2	2	3	2	2	2
+1	2	4	2	2	2
+2	2	4	2	2	2
+1	2	3	2	3	3
+2	2	3	2	3	3
+1	2	4	2	3	3
+2	2	4	2	3	3
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
+FROM t2
+LEFT JOIN              
+(t3, t4, t5)
+ON t2.b=t4.b;
+a	b	a	b	a	b	a	b
+3	3	NULL	NULL	NULL	NULL	NULL	NULL
+4	2	1	2	3	2	3	1
+4	2	1	2	3	2	2	2
+4	2	1	2	3	2	3	3
+4	2	1	2	4	2	3	1
+4	2	1	2	4	2	2	2
+4	2	1	2	4	2	3	3
+4	2	2	2	3	2	3	1
+4	2	2	2	3	2	2	2
+4	2	2	2	3	2	3	3
+4	2	2	2	4	2	3	1
+4	2	2	2	4	2	2	2
+4	2	2	2	4	2	3	3
+5	3	NULL	NULL	NULL	NULL	NULL	NULL
+EXPLAIN
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
+FROM t2
+LEFT JOIN              
+(t3, t4, t5)
+ON t2.b=t4.b
+WHERE t3.a>1 OR t3.c IS NULL;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
+FROM t2
+LEFT JOIN              
+(t3, t4, t5)
+ON t2.b=t4.b
+WHERE t3.a>1 OR t3.c IS NULL;
+a	b	a	b	a	b	a	b
+3	3	NULL	NULL	NULL	NULL	NULL	NULL
+4	2	2	2	3	2	3	1
+4	2	2	2	3	2	2	2
+4	2	2	2	3	2	3	3
+4	2	2	2	4	2	3	1
+4	2	2	2	4	2	2	2
+4	2	2	2	4	2	3	3
+5	3	NULL	NULL	NULL	NULL	NULL	NULL
+EXPLAIN
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
+FROM t2
+LEFT JOIN              
+(t3, t4, t5)
+ON t2.b=t4.b
+WHERE (t3.a>1 OR t3.c IS NULL) AND 
+(t5.a<3 OR t5.c IS NULL);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	Using where
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,t5.a,t5.b
+FROM t2
+LEFT JOIN              
+(t3, t4, t5)
+ON t2.b=t4.b
+WHERE (t3.a>1 OR t3.c IS NULL) AND 
+(t5.a<3 OR t5.c IS NULL);
+a	b	a	b	a	b	a	b
+3	3	NULL	NULL	NULL	NULL	NULL	NULL
+4	2	2	2	3	2	2	2
+4	2	2	2	4	2	2	2
+5	3	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t6.a,t6.b
+FROM t6;
+a	b
+3	2
+6	2
+6	1
+SELECT t7.a,t7.b
+FROM t7;
+a	b
+1	1
+2	2
+SELECT t6.a,t6.b,t7.a,t7.b
+FROM t6,t7;
+a	b	a	b
+3	2	1	1
+6	2	1	1
+6	1	1	1
+3	2	2	2
+6	2	2	2
+6	1	2	2
+SELECT t8.a,t8.b
+FROM t8;
+a	b
+0	2
+1	2
+EXPLAIN
+SELECT t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	
+SELECT t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10;
+a	b	a	b	a	b
+3	2	1	1	NULL	NULL
+6	2	1	1	NULL	NULL
+6	1	1	1	NULL	NULL
+3	2	2	2	0	2
+3	2	2	2	1	2
+6	2	2	2	0	2
+6	2	2	2	1	2
+6	1	2	2	0	2
+6	1	2	2	1	2
+SELECT t5.a,t5.b
+FROM t5;
+a	b
+3	1
+2	2
+3	3
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b;
+a	b	a	b	a	b	a	b
+3	1	3	2	1	1	NULL	NULL
+3	1	6	2	1	1	NULL	NULL
+2	2	3	2	2	2	0	2
+2	2	3	2	2	2	1	2
+2	2	6	2	2	2	0	2
+2	2	6	2	2	2	1	2
+3	3	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b AND
+(t8.a < 1 OR t8.c IS NULL);
+a	b	a	b	a	b	a	b
+3	1	3	2	1	1	NULL	NULL
+3	1	6	2	1	1	NULL	NULL
+2	2	3	2	2	2	0	2
+2	2	6	2	2	2	0	2
+3	3	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b;
+a	b	a	b	a	b
+3	3	NULL	NULL	NULL	NULL
+4	2	1	2	3	2
+4	2	1	2	4	2
+5	3	NULL	NULL	NULL	NULL
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b;
+a	b	a	b	a	b	a	b	a	b	a	b	a	b
+3	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+3	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
+4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
+5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+4	2	1	2	3	2	2	2	3	2	2	2	0	2
+4	2	1	2	3	2	2	2	3	2	2	2	1	2
+4	2	1	2	3	2	2	2	6	2	2	2	0	2
+4	2	1	2	3	2	2	2	6	2	2	2	1	2
+4	2	1	2	4	2	2	2	3	2	2	2	0	2
+4	2	1	2	4	2	2	2	3	2	2	2	1	2
+4	2	1	2	4	2	2	2	6	2	2	2	0	2
+4	2	1	2	4	2	2	2	6	2	2	2	1	2
+5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+3	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b
+WHERE t2.a > 3 AND
+(t6.a < 6 OR t6.c IS NULL);
+a	b	a	b	a	b	a	b	a	b	a	b	a	b
+4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+4	2	1	2	3	2	2	2	3	2	2	2	0	2
+4	2	1	2	3	2	2	2	3	2	2	2	1	2
+4	2	1	2	4	2	2	2	3	2	2	2	0	2
+4	2	1	2	4	2	2	2	3	2	2	2	1	2
+5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t1.a,t1.b
+FROM t1;
+a	b
+1	3
+2	2
+3	2
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2);
+a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
+1	3	3	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+1	3	3	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+1	3	3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+1	3	3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+1	3	3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+1	3	3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+1	3	3	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	3	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+1	3	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
+1	3	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	3	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+1	3	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
+1	3	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+1	3	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	3	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+3	2	3	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+3	2	3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+3	2	3	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+3	2	3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+3	2	3	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+3	2	3	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
+3	2	4	2	1	2	3	2	2	2	3	2	2	2	0	2
+3	2	4	2	1	2	3	2	2	2	3	2	2	2	1	2
+3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2
+3	2	4	2	1	2	3	2	2	2	6	2	2	2	1	2
+3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
+3	2	4	2	1	2	4	2	2	2	3	2	2	2	0	2
+3	2	4	2	1	2	4	2	2	2	3	2	2	2	1	2
+3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2
+3	2	4	2	1	2	4	2	2	2	6	2	2	2	1	2
+3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2)
+WHERE (t2.a >= 4 OR t2.c IS NULL);
+a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
+1	3	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+1	3	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
+1	3	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	3	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+1	3	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
+1	3	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+1	3	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+1	3	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
+3	2	4	2	1	2	3	2	2	2	3	2	2	2	0	2
+3	2	4	2	1	2	3	2	2	2	3	2	2	2	1	2
+3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2
+3	2	4	2	1	2	3	2	2	2	6	2	2	2	1	2
+3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
+3	2	4	2	1	2	4	2	2	2	3	2	2	2	0	2
+3	2	4	2	1	2	4	2	2	2	3	2	2	2	1	2
+3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2
+3	2	4	2	1	2	4	2	2	2	6	2	2	2	1	2
+3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+3	2	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+SELECT t0.a,t0.b
+FROM t0;
+a	b
+1	1
+1	2
+2	2
+EXPLAIN
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2)
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	
+1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2)
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL);
+a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
+1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL
+1	2	3	2	4	2	1	2	3	2	3	1	3	2	1	1	NULL	NULL
+1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL
+1	2	3	2	4	2	1	2	3	2	2	2	3	2	2	2	0	2
+1	2	3	2	4	2	1	2	3	2	2	2	3	2	2	2	1	2
+1	2	3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2
+1	2	3	2	4	2	1	2	3	2	2	2	6	2	2	2	1	2
+1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	2	3	2	4	2	1	2	4	2	3	1	3	2	1	1	NULL	NULL
+1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL
+1	2	3	2	4	2	1	2	4	2	2	2	3	2	2	2	0	2
+1	2	3	2	4	2	1	2	4	2	2	2	3	2	2	2	1	2
+1	2	3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2
+1	2	3	2	4	2	1	2	4	2	2	2	6	2	2	2	1	2
+1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	3	2	1	1	NULL	NULL
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	0	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	3	2	2	2	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL
+EXPLAIN
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	Using where
+SELECT t9.a,t9.b
+FROM t9;
+a	b
+1	1
+1	2
+3	3
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
+1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL	1	1
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2	1	2
+1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2	1	2
+1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+SELECT t1.a,t1.b
+FROM t1;
+a	b
+1	3
+2	2
+3	2
+SELECT t2.a,t2.b
+FROM t2;
+a	b
+3	3
+4	2
+5	3
+SELECT t3.a,t3.b
+FROM t3;
+a	b
+1	2
+2	2
+SELECT t2.a,t2.b,t3.a,t3.b
+FROM t2 
+LEFT JOIN              
+t3
+ON t2.b=t3.b;
+a	b	a	b
+3	3	NULL	NULL
+4	2	1	2
+4	2	2	2
+5	3	NULL	NULL
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b
+FROM t1, t2 
+LEFT JOIN              
+t3
+ON t2.b=t3.b
+WHERE t1.a <= 2;
+a	b	a	b	a	b
+1	3	3	3	NULL	NULL
+2	2	3	3	NULL	NULL
+1	3	4	2	1	2
+1	3	4	2	2	2
+2	2	4	2	1	2
+2	2	4	2	2	2
+1	3	5	3	NULL	NULL
+2	2	5	3	NULL	NULL
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b
+FROM t1, t3 
+RIGHT JOIN              
+t2
+ON t2.b=t3.b
+WHERE t1.a <= 2;
+a	b	a	b	a	b
+1	3	3	3	NULL	NULL
+2	2	3	3	NULL	NULL
+1	3	4	2	1	2
+1	3	4	2	2	2
+2	2	4	2	1	2
+2	2	4	2	2	2
+1	3	5	3	NULL	NULL
+2	2	5	3	NULL	NULL
+SELECT t3.a,t3.b,t4.a,t4.b
+FROM t3,t4;
+a	b	a	b
+1	2	3	2
+2	2	3	2
+1	2	4	2
+2	2	4	2
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t2 
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b;
+a	b	a	b	a	b
+3	3	NULL	NULL	NULL	NULL
+4	2	1	2	3	2
+4	2	1	2	4	2
+5	3	NULL	NULL	NULL	NULL
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t1, t2 
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b
+WHERE t1.a <= 2;
+a	b	a	b	a	b	a	b
+1	3	3	3	NULL	NULL	NULL	NULL
+2	2	3	3	NULL	NULL	NULL	NULL
+1	3	4	2	1	2	3	2
+1	3	4	2	1	2	4	2
+2	2	4	2	1	2	3	2
+2	2	4	2	1	2	4	2
+1	3	5	3	NULL	NULL	NULL	NULL
+2	2	5	3	NULL	NULL	NULL	NULL
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t1, (t3, t4) 
+RIGHT JOIN              
+t2
+ON t3.a=1 AND t2.b=t4.b
+WHERE t1.a <= 2;
+a	b	a	b	a	b	a	b
+1	3	3	3	NULL	NULL	NULL	NULL
+2	2	3	3	NULL	NULL	NULL	NULL
+1	3	4	2	1	2	3	2
+1	3	4	2	1	2	4	2
+2	2	4	2	1	2	3	2
+2	2	4	2	1	2	4	2
+1	3	5	3	NULL	NULL	NULL	NULL
+2	2	5	3	NULL	NULL	NULL	NULL
+SELECT t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t1, t3, t4 
+RIGHT JOIN              
+t2
+ON t3.a=1 AND t2.b=t4.b
+WHERE t1.a <= 2;
+a	b	a	b	a	b	a	b
+1	3	3	3	1	2	NULL	NULL
+2	2	3	3	1	2	NULL	NULL
+1	3	3	3	2	2	NULL	NULL
+2	2	3	3	2	2	NULL	NULL
+1	3	4	2	1	2	3	2
+1	3	4	2	1	2	4	2
+2	2	4	2	1	2	3	2
+2	2	4	2	1	2	4	2
+1	3	4	2	2	2	NULL	NULL
+2	2	4	2	2	2	NULL	NULL
+1	3	5	3	1	2	NULL	NULL
+2	2	5	3	1	2	NULL	NULL
+1	3	5	3	2	2	NULL	NULL
+2	2	5	3	2	2	NULL	NULL
+CREATE INDEX idx_b ON t2(b);
+EXPLAIN
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t3,t4 
+LEFT JOIN              
+(t1,t2)
+ON t3.a=1 AND t3.b=t2.b AND t2.b=t4.b;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	
+1	SIMPLE	t2	ref	idx_b	idx_b	5	test.t3.b	2	
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	
+SELECT t2.a,t2.b,t3.a,t3.b,t4.a,t4.b
+FROM t3,t4 
+LEFT JOIN              
+(t1,t2)
+ON t3.a=1 AND t3.b=t2.b AND t2.b=t4.b;
+a	b	a	b	a	b
+4	2	1	2	3	2
+4	2	1	2	3	2
+4	2	1	2	3	2
+NULL	NULL	2	2	3	2
+4	2	1	2	4	2
+4	2	1	2	4	2
+4	2	1	2	4	2
+NULL	NULL	2	2	4	2
+EXPLAIN
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	Using where
+CREATE INDEX idx_b ON t4(b);
+CREATE INDEX idx_b ON t5(b);
+EXPLAIN
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	Using where
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t8	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	Using where
+CREATE INDEX idx_b ON t8(b);
+EXPLAIN
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	Using where
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t7.b	2	Using where
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	Using where
+CREATE INDEX idx_b ON t1(b);
+CREATE INDEX idx_a ON t0(a);
+EXPLAIN
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t0	ref	idx_a	idx_a	5	const	1	Using where
+1	SIMPLE	t1	ref	idx_b	idx_b	5	test.t0.b	2	Using where
+1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	Using where
+1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	Using where
+1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	Using where
+1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t7.b	2	Using where
+1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	Using where
+SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
+t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
+FROM t0,t1
+LEFT JOIN                
+( 
+t2
+LEFT JOIN              
+(t3, t4)
+ON t3.a=1 AND t2.b=t4.b,
+t5 
+LEFT JOIN 
+( 
+t6,
+t7 
+LEFT JOIN 
+t8
+ON t7.b=t8.b AND t6.b < 10
+)
+ON t6.b >= 2 AND t5.b=t7.b 
+)
+ON (t3.b=2 OR t3.c IS NULL) AND (t6.b=2 OR t6.c IS NULL) AND
+(t1.b=t5.b OR t3.c IS NULL OR t6.c IS NULL or t8.c IS NULL) AND
+(t1.a != 2),
+t9
+WHERE t0.a=1 AND
+t0.b=t1.b AND          
+(t2.a >= 4 OR t2.c IS NULL) AND
+(t3.a < 5 OR t3.c IS NULL) AND
+(t3.b=t4.b OR t3.c IS NULL OR t4.c IS NULL) AND
+(t5.a >=2 OR t5.c IS NULL) AND
+(t6.a >=4 OR t6.c IS NULL) AND
+(t7.a <= 2 OR t7.c IS NULL) AND
+(t8.a < 1 OR t8.c IS NULL) AND
+(t8.b=t9.b OR t8.c IS NULL) AND
+(t9.a=1);
+a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b	a	b
+1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL	1	1
+1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL	1	1
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	1
+1	2	2	2	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	3	2	3	1	6	2	1	1	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	3	2	2	2	6	2	2	2	0	2	1	2
+1	2	3	2	4	2	1	2	3	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	4	2	3	1	6	2	1	1	NULL	NULL	1	2
+1	2	3	2	4	2	1	2	4	2	2	2	6	2	2	2	0	2	1	2
+1	2	3	2	4	2	1	2	4	2	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	1	6	2	1	1	NULL	NULL	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	2	2	6	2	2	2	0	2	1	2
+1	2	3	2	5	3	NULL	NULL	NULL	NULL	3	3	NULL	NULL	NULL	NULL	NULL	NULL	1	2
+SELECT t2.a,t2.b
+FROM t2;
+a	b
+3	3
+4	2
+5	3
+SELECT t3.a,t3.b
+FROM t3;
+a	b
+1	2
+2	2
+SELECT t2.a,t2.b,t3.a,t3.b
+FROM t2 LEFT JOIN t3 ON t2.b=t3.b
+WHERE t2.a = 4 OR (t2.a > 4 AND t3.a IS NULL);
+a	b	a	b
+4	2	1	2
+4	2	2	2
+5	3	NULL	NULL
+SELECT t2.a,t2.b,t3.a,t3.b
+FROM t2 LEFT JOIN (t3) ON t2.b=t3.b
+WHERE t2.a = 4 OR (t2.a > 4 AND t3.a IS NULL);
+a	b	a	b
+4	2	1	2
+4	2	2	2
+5	3	NULL	NULL
+ALTER TABLE t3
+CHANGE COLUMN a a1 int,
+CHANGE COLUMN c c1 int;
+SELECT t2.a,t2.b,t3.a1,t3.b
+FROM t2 LEFT JOIN t3 ON t2.b=t3.b
+WHERE t2.a = 4 OR (t2.a > 4 AND t3.a1 IS NULL);
+a	b	a1	b
+4	2	1	2
+4	2	2	2
+5	3	NULL	NULL
+SELECT t2.a,t2.b,t3.a1,t3.b
+FROM t2 NATURAL LEFT JOIN t3
+WHERE t2.a = 4 OR (t2.a > 4 AND t3.a1 IS NULL);
+a	b	a1	b
+4	2	1	2
+4	2	2	2
+5	3	NULL	NULL
+DROP TABLE t0,t1,t2,t3,t4,t5,t6,t7,t8,t9;