null_key.test, null_key.result:

  Made the test case for bug #12144 independent on other tests.

mysql-test/r/null_key.result

@@ -404,14 +404,7 @@ 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
+FLUSH STATUS ;
 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
@@ -421,12 +414,12 @@ a	a	b	b
 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_first	0
+Handler_read_key	6
+Handler_read_next	2
 Handler_read_prev	0
 Handler_read_rnd	0
-Handler_read_rnd_next	152
+Handler_read_rnd_next	5
 SELECT FOUND_ROWS();
 FOUND_ROWS()
 4

mysql-test/t/null_key.test

@@ -230,14 +230,10 @@ 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%";
-
-
+FLUSH STATUS ;
 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,t4;