null_key.test, null_key.result:

  Modified the test case for patch of the bug #12144
  to display status of Handler_read_next before and
  after the tested query.

mysql-test/r/null_key.result

@@ -367,23 +367,51 @@ drop table t1;
 CREATE TABLE t1 (a int);
 CREATE TABLE t2 (a int, b int, INDEX idx(a));
 CREATE TABLE t3 (b int, INDEX idx(b));
+CREATE TABLE t4 (b int, INDEX idx(b));
 INSERT INTO t1 VALUES (1), (2), (3), (4);
 INSERT INTO t2 VALUES (1, 1), (3, 1);
 INSERT INTO t3 VALUES 
 (NULL), (NULL), (NULL), (NULL), (NULL),
-(NULL), (NULL), (NULL), (NULL), (NULL),
-(2);
+(NULL), (NULL), (NULL), (NULL), (NULL);
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t3 VALUES (2), (3);
 ANALYZE table t1, t2, t3;
 Table	Op	Msg_type	Msg_text
 test.t1	analyze	status	OK
 test.t2	analyze	status	OK
 test.t3	analyze	status	OK
+SELECT COUNT(*) FROM t3;
+COUNT(*)
+15972
 EXPLAIN SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
 LEFT JOIN t3 ON t2.b=t3.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	
 1	SIMPLE	t2	ref	idx	idx	5	test.t1.a	1	
 1	SIMPLE	t3	ref	idx	idx	5	test.t2.b	1	Using index
+SHOW STATUS LIKE "handler_read%";
+Variable_name	Value
+Handler_read_first	25
+Handler_read_key	63
+Handler_read_next	25979
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	147
 SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
 LEFT JOIN t3 ON t2.b=t3.b;
 a	a	b	b
@@ -391,7 +419,15 @@ a	a	b	b
 2	NULL	NULL	NULL
 3	3	1	NULL
 4	NULL	NULL	NULL
+SHOW STATUS LIKE "handler_read%";
+Variable_name	Value
+Handler_read_first	25
+Handler_read_key	69
+Handler_read_next	25981
+Handler_read_prev	0
+Handler_read_rnd	0
+Handler_read_rnd_next	152
 SELECT FOUND_ROWS();
 FOUND_ROWS()
 4
-DROP TABLE t1,t2,t3;
+DROP TABLE t1,t2,t3,t4;

mysql-test/t/null_key.test

@@ -200,21 +200,45 @@ drop table t1;
 CREATE TABLE t1 (a int);
 CREATE TABLE t2 (a int, b int, INDEX idx(a));
 CREATE TABLE t3 (b int, INDEX idx(b));
+CREATE TABLE t4 (b int, INDEX idx(b));
 INSERT INTO t1 VALUES (1), (2), (3), (4);
 INSERT INTO t2 VALUES (1, 1), (3, 1);
 INSERT INTO t3 VALUES 
   (NULL), (NULL), (NULL), (NULL), (NULL),
-  (NULL), (NULL), (NULL), (NULL), (NULL),
-  (2);
+  (NULL), (NULL), (NULL), (NULL), (NULL);
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t4 SELECT * FROM t3;
+INSERT INTO t3 SELECT * FROM t4;
+INSERT INTO t3 VALUES (2), (3);
+
 ANALYZE table t1, t2, t3;
 
+SELECT COUNT(*) FROM t3;
+
 EXPLAIN SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
                                              LEFT JOIN t3 ON t2.b=t3.b;
+SHOW STATUS LIKE "handler_read%";
+
 
 SELECT SQL_CALC_FOUND_ROWS * FROM t1 LEFT JOIN t2 ON t1.a=t2.a
                                      LEFT JOIN t3 ON t2.b=t3.b;
 
+SHOW STATUS LIKE "handler_read%";
+
 SELECT FOUND_ROWS();
 
-DROP TABLE t1,t2,t3;
+DROP TABLE t1,t2,t3,t4;
 # End of 4.1 tests