Make EXPLAIN better at displaying MRR/BKA:

- "Using MRR" is no longer shown with range access. - Instead, both range and BKA accesses will show one of the following: = "Rowid-ordered scan" = "Key-ordered scan" = "Key-ordered Rowid-ordered scan" depending on whether DS-MRR implementation will do scan keys in order, rowids in order, or both. - The patch also introduces a way for other storage engines/MRR implementations to pass information to EXPLAIN output about the properties of employed MRR scans.
2025-07-29 05:21:33 +03:00 · 2011-04-02 14:04:45 +04:00
parent 886d84d6d1
commit 997445bc8e
46 changed files with 624 additions and 467 deletions
--- a/mysql-test/r/ctype_collate.result
+++ b/mysql-test/r/ctype_collate.result
@ -578,19 +578,19 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	s2	NULL	NULL	NULL	10	Using where
 EXPLAIN SELECT * FROM t1 WHERE s1 BETWEEN 'a' AND 'b' COLLATE latin1_german1_ci;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	s1	s1	11	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	s1	s1	11	NULL	2	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE s2 BETWEEN 'a' AND 'b' COLLATE latin1_german1_ci;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	s2	NULL	NULL	NULL	10	Using where
 EXPLAIN SELECT * FROM t1 WHERE s1 IN  ('a','b' COLLATE latin1_german1_ci);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	s1	s1	11	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	s1	s1	11	NULL	2	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE s2 IN  ('a','b' COLLATE latin1_german1_ci);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	s2	NULL	NULL	NULL	10	Using where
 EXPLAIN SELECT * FROM t1 WHERE s1 LIKE 'a' COLLATE latin1_german1_ci;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	s1	s1	11	NULL	1	Using index condition; Using MRR
+1	SIMPLE	t1	range	s1	s1	11	NULL	1	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE s2 LIKE 'a' COLLATE latin1_german1_ci;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	s2	NULL	NULL	NULL	10	Using where
--- a/mysql-test/r/func_in.result
+++ b/mysql-test/r/func_in.result
@ -241,7 +241,7 @@ insert into t2 select C.a*2+1, 'yes' from t1 C;
 explain 
 select * from t2 where a NOT IN (0, 2,4,6,8,10,12,14,16,18);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	range	a	a	5	NULL	12	Using index condition; Using MRR
+1	SIMPLE	t2	range	a	a	5	NULL	12	Using index condition; Rowid-ordered scan
 select * from t2 where a NOT IN (0, 2,4,6,8,10,12,14,16,18);
 a	filler
 1	yes
@ -256,10 +256,10 @@ a	filler
 19	yes
 explain select * from t2 force index(a) where a NOT IN (2,2,2,2,2,2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	range	a	a	5	NULL	912	Using index condition; Using MRR
+1	SIMPLE	t2	range	a	a	5	NULL	912	Using index condition; Rowid-ordered scan
 explain select * from t2 force index(a) where a <> 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	range	a	a	5	NULL	912	Using index condition; Using MRR
+1	SIMPLE	t2	range	a	a	5	NULL	912	Using index condition; Rowid-ordered scan
 drop table t2;
 create table t2 (a datetime, filler char(200), key(a));
 insert into t2 select '2006-04-25 10:00:00' + interval C.a minute,
@ -271,7 +271,7 @@ select * from t2 where a NOT IN (
 '2006-04-25 10:00:00','2006-04-25 10:02:00','2006-04-25 10:04:00', 
 '2006-04-25 10:06:00', '2006-04-25 10:08:00');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	range	a	a	9	NULL	18	Using index condition; Using MRR
+1	SIMPLE	t2	range	a	a	9	NULL	18	Using index condition; Rowid-ordered scan
 select * from t2 where a NOT IN (
 '2006-04-25 10:00:00','2006-04-25 10:02:00','2006-04-25 10:04:00', 
 '2006-04-25 10:06:00', '2006-04-25 10:08:00');
@ -295,7 +295,7 @@ insert into t2 values ('fon', '1'), ('fop','1'), ('barbaq','1'),
 ('barbas','1'), ('bazbazbay', '1'),('zz','1');
 explain select * from t2 where a not in('foo','barbar', 'bazbazbaz');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	range	a	a	13	NULL	7	Using index condition; Using MRR
+1	SIMPLE	t2	range	a	a	13	NULL	7	Using index condition; Rowid-ordered scan
 drop table t2;
 create table t2 (a decimal(10,5), filler char(200), key(a));
 insert into t2 select 345.67890, 'no' from t1 A, t1 B;
@ -306,7 +306,7 @@ insert into t2 values (0, '1'), (22334.123,'1'), (33333,'1'),
 explain
 select * from t2 where a not in (345.67890, 43245.34, 64224.56344);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	range	a	a	7	NULL	7	Using index condition; Using MRR
+1	SIMPLE	t2	range	a	a	7	NULL	7	Using index condition; Rowid-ordered scan
 select * from t2 where a not in (345.67890, 43245.34, 64224.56344);
 a	filler
 0.00000	1
@ -630,16 +630,16 @@ INSERT INTO t1 (c_int) SELECT 0 FROM t1;
 INSERT INTO t1 (c_int) SELECT 0 FROM t1;
 EXPLAIN SELECT * FROM t1 WHERE c_int IN (1, 2, 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_int	c_int	4	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_int	c_int	4	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_int IN (NULL, 1, 2, 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_int	c_int	4	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_int	c_int	4	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_int IN (1, 2, 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_int	c_int	4	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_int	c_int	4	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_int IN (1, NULL, 2, NULL, 3, NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_int	c_int	4	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_int	c_int	4	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_int IN (NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@ -648,10 +648,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 EXPLAIN SELECT * FROM t1 WHERE c_decimal IN (1, 2, 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_decimal	c_decimal	3	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_decimal	c_decimal	3	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_decimal IN (NULL, 1, 2, 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_decimal	c_decimal	3	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_decimal	c_decimal	3	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_decimal IN (NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@ -660,10 +660,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 EXPLAIN SELECT * FROM t1 WHERE c_float IN (1, 2, 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_float	c_float	4	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_float	c_float	4	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_float IN (NULL, 1, 2, 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_float	c_float	4	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_float	c_float	4	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_float IN (NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@ -672,10 +672,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 EXPLAIN SELECT * FROM t1 WHERE c_bit IN (1, 2, 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_bit	c_bit	2	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_bit	c_bit	2	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_bit IN (NULL, 1, 2, 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_bit	c_bit	2	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_bit	c_bit	2	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_bit IN (NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@ -685,11 +685,11 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN SELECT * FROM t1 WHERE c_date 
 IN ('2009-09-01', '2009-09-02', '2009-09-03');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_date	c_date	3	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_date	c_date	3	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_date
 IN (NULL, '2009-09-01', '2009-09-02', '2009-09-03');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_date	c_date	3	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_date	c_date	3	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_date IN (NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@ -699,11 +699,11 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN SELECT * FROM t1 WHERE c_datetime
 IN ('2009-09-01 00:00:01', '2009-09-02 00:00:01', '2009-09-03 00:00:01');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_datetime	c_datetime	8	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_datetime	c_datetime	8	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_datetime
 IN (NULL, '2009-09-01 00:00:01', '2009-09-02 00:00:01', '2009-09-03 00:00:01');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_datetime	c_datetime	8	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_datetime	c_datetime	8	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_datetime IN (NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@ -713,11 +713,11 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN SELECT * FROM t1 WHERE c_timestamp
 IN ('2009-09-01 00:00:01', '2009-09-01 00:00:02', '2009-09-01 00:00:03');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_timestamp	c_timestamp	4	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_timestamp	c_timestamp	4	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_timestamp
 IN (NULL, '2009-09-01 00:00:01', '2009-09-01 00:00:02', '2009-09-01 00:00:03');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_timestamp	c_timestamp	4	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_timestamp	c_timestamp	4	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_timestamp IN (NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@ -726,10 +726,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 EXPLAIN SELECT * FROM t1 WHERE c_year IN (1, 2, 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_year	c_year	1	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_year	c_year	1	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_year IN (NULL, 1, 2, 3);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_year	c_year	1	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_year	c_year	1	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_year IN (NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
@ -738,10 +738,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
 EXPLAIN SELECT * FROM t1 WHERE c_char IN ('1', '2', '3');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_char	c_char	10	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_char	c_char	10	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_char IN (NULL, '1', '2', '3');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c_char	c_char	10	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	c_char	c_char	10	NULL	3	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE c_char IN (NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
--- a/mysql-test/r/index_intersect.result
+++ b/mysql-test/r/index_intersect.result
@ -74,12 +74,12 @@ EXPLAIN
 SELECT * FROM City 
 WHERE Name LIKE 'M%' AND Population > 300000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population,Name	Name	35	NULL	#	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	Population,Name	Name	35	NULL	#	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE Name LIKE 'M%' AND Population > 7000000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population,Name	Population	4	NULL	#	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	Population,Name	Population	4	NULL	#	Using index condition; Using where; Rowid-ordered scan
 SELECT * FROM City USE INDEX ()
 WHERE Name LIKE 'C%' AND Population > 1000000;
 ID	Name	Country	Population
@ -371,7 +371,7 @@ EXPLAIN
 SELECT * FROM City 
 WHERE Name BETWEEN 'G' AND 'K' AND Population > 500000 AND Country LIKE 'C%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population,Country,Name	Name	35	NULL	#	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	Population,Country,Name	Name	35	NULL	#	Using index condition; Using where; Rowid-ordered scan
 SELECT * FROM City USE INDEX ()
 WHERE Name BETWEEN 'M' AND 'N' AND Population > 1000000 AND Country LIKE 'C%';
 ID	Name	Country	Population
@ -462,7 +462,7 @@ EXPLAIN
 SELECT * FROM City
 WHERE ID BETWEEN 501 AND 1000 AND Population > 700000 AND Country LIKE 'C%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY,Population,Country	Population	4	NULL	#	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	PRIMARY,Population,Country	Population	4	NULL	#	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE ID BETWEEN 1 AND 500 AND Population > 1000000 AND Country LIKE 'A%';
@ -472,7 +472,7 @@ EXPLAIN
 SELECT * FROM City 
 WHERE ID BETWEEN 2001 AND 2500 AND Population > 300000 AND Country LIKE 'H%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY,Population,Country	Country	3	NULL	#	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	PRIMARY,Population,Country	Country	3	NULL	#	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City 
 WHERE ID BETWEEN 3701 AND 4000 AND Population > 1000000
@ -484,7 +484,7 @@ SELECT * FROM City
 WHERE ID BETWEEN 3001 AND 4000 AND Population > 600000
 AND Country BETWEEN 'S' AND 'Z' ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY,Population,Country	Population	4	NULL	#	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	PRIMARY,Population,Country	Population	4	NULL	#	Using index condition; Using where; Rowid-ordered scan
 SELECT * FROM City USE INDEX ()
 WHERE ID BETWEEN 501 AND 1000 AND Population > 700000 AND Country LIKE 'C%';
 ID	Name	Country	Population
@ -733,7 +733,7 @@ EXPLAIN
 SELECT * FROM City 
 WHERE  Name BETWEEN 'G' AND 'J' AND Population > 500000 AND Country LIKE 'C%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population,Country,Name	Name	35	NULL	#	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	Population,Country,Name	Name	35	NULL	#	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE ID BETWEEN 1 AND 500 AND Population > 1000000 AND Country LIKE 'A%';
@ -744,7 +744,7 @@ SELECT * FROM City
 WHERE ID BETWEEN 3001 AND 4000 AND Population > 600000
 AND Country BETWEEN 'S' AND 'Z';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY,Population,Country	Population	4	NULL	#	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	PRIMARY,Population,Country	Population	4	NULL	#	Using index condition; Using where; Rowid-ordered scan
 SELECT * FROM City WHERE
 Name LIKE 'C%' AND Population > 1000000;
 ID	Name	Country	Population
@ -1028,7 +1028,7 @@ EXPLAIN
 SELECT * FROM t1
 WHERE (f1 < 535  OR  f1 > 985) AND ( f4='r' OR f4 LIKE 'a%' ) ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY,f4	f4	35	NULL	#	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY,f4	f4	35	NULL	#	Using index condition; Using where; Rowid-ordered scan
 SELECT * FROM t1
 WHERE (f1 < 535  OR  f1 > 985) AND ( f4='r' OR f4 LIKE 'a%' ) ;
 f1	f4	f5
--- a/mysql-test/r/index_merge_myisam.result
+++ b/mysql-test/r/index_merge_myisam.result
@ -21,7 +21,7 @@ Table	Op	Msg_type	Msg_text
 test.t0	analyze	status	OK
 explain select * from t0 where key1 < 3 or key1 > 1020;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	range	i1	i1	4	NULL	78	Using index condition; Using MRR
+1	SIMPLE	t0	range	i1	i1	4	NULL	78	Using index condition; Rowid-ordered scan
 explain
 select * from t0 where key1 < 3 or key2 > 1020;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@ -74,7 +74,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	17	Using sort_union(i1,i2); Using where
 explain select * from t0 where key2 = 45 or key1 <=> null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	range	i1,i2	i2	4	NULL	1	Using where; Using MRR
+1	SIMPLE	t0	range	i1,i2	i2	4	NULL	1	Using where; Rowid-ordered scan
 explain select * from t0 where key2 = 45 or key1 is not null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t0	ALL	i1,i2	NULL	NULL	NULL	1024	Using where
@ -277,7 +277,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 explain select * from t0,t1 where t0.key1 < 3 and
 (t1.key1 = t0.key1 or t1.key8 = t0.key1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	range	i1	i1	4	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t0	range	i1	i1	4	NULL	3	Using index condition; Rowid-ordered scan
 1	SIMPLE	t1	ALL	i1,i8	NULL	NULL	NULL	1024	Range checked for each record (index map: 0x81)
 explain select * from t1 where key1=3 or key2=4
 union select * from t1 where key1<4 or key3=5;
@ -1379,7 +1379,7 @@ primary key (pk1, pk2)
 );
 explain select * from t1 where pk1 = 1 and pk2 < 80  and key1=0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY,key1	PRIMARY	8	NULL	7	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY,key1	PRIMARY	8	NULL	7	Using index condition; Using where; Rowid-ordered scan
 select * from t1 where pk1 = 1 and pk2 < 80  and key1=0;
 pk1	pk2	key1	key2	pktail1ok	pktail2ok	pktail3bad	pktail4bad	pktail5bad	pk2copy	badkey	filler1	filler2
 1	19	0	0	0	0	0	0	0	19	0	filler-data-19	filler2
--- a/mysql-test/r/innodb.result
+++ b/mysql-test/r/innodb.result
@ -1295,7 +1295,7 @@ count(*)
 623
 explain select * from t1 where c between 1 and 2500;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c	c	5	NULL	#	Using index condition; Using MRR
+1	SIMPLE	t1	range	c	c	5	NULL	#	Using index condition; Rowid-ordered scan
 update t1 set c=a;
 explain select * from t1 where c between 1 and 2500;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
--- a/mysql-test/r/innodb_mrr.result
+++ b/mysql-test/r/innodb_mrr.result
@ -184,7 +184,7 @@ explain
 select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1'
                                                      or c='no-such-row2');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	range	idx1	idx1	29	NULL	16	Using index condition; Using MRR
+1	SIMPLE	t4	range	idx1	idx1	29	NULL	16	Using index condition; Rowid-ordered scan
 select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1'
                                                    or c='no-such-row2');
 a	b	c	filler
@ -206,7 +206,7 @@ NULL	NULL	NULL	NULL-1
 explain 
 select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	range	idx1	idx1	29	NULL	32	Using index condition; Using MRR
+1	SIMPLE	t4	range	idx1	idx1	29	NULL	32	Using index condition; Rowid-ordered scan
 select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2');
 a	b	c	filler
 b-1	NULL	c-1	NULL-15
@ -309,7 +309,7 @@ from t1 A, t1 B, t1 C;
 explain
 select count(length(a) + length(filler)) from t2 where a>='a-1000-a' and a <'a-1001-a';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	range	a	a	9	NULL	99	Using index condition; Using MRR
+1	SIMPLE	t2	range	a	a	9	NULL	99	Using index condition; Rowid-ordered scan
 select count(length(a) + length(filler)) from t2 where a>='a-1000-a' and a <'a-1001-a';
 count(length(a) + length(filler))
 100
@ -319,7 +319,7 @@ filler char(10), key(d), primary key (a,b,c)) engine= innodb;
 insert into t2 select A.a, B.a, B.a, A.a, 'filler' from t1 A, t1 B;
 explain select * from t2 force index (d) where d < 10;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	range	d	d	5	NULL	#	Using index condition; Using MRR
+1	SIMPLE	t2	range	d	d	5	NULL	#	Using index condition; Rowid-ordered scan
 drop table t2;
 drop table t1;
 set @@mrr_buffer_size= @mrr_buffer_size_save;
--- a/mysql-test/r/innodb_mrr_cpk.result
+++ b/mysql-test/r/innodb_mrr_cpk.result
@ -25,7 +25,7 @@ This should use join buffer:
 explain select * from t1, t2 where t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
-1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	8	test.t2.a	1	Using join buffer (flat, BKA join)
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	8	test.t2.a	1	Using join buffer (flat, BKA join); Key-ordered scan
 This output must be sorted by value of t1.a:
 select * from t1, t2 where t1.a=t2.a;
 a	b	filler	a
@ -47,7 +47,7 @@ insert into t2 values ('a-1010=A', 1010), ('a-1030=A', 1030), ('a-1020=A', 1020)
 explain select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
-1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	28	test.t2.a,test.t2.b	1	Using join buffer (flat, BKA join)
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	28	test.t2.a,test.t2.b	1	Using join buffer (flat, BKA join); Key-ordered scan
 select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
 a	b	filler	a	b
 a-1010=A	1010	filler	a-1010=A	1010
@ -57,7 +57,7 @@ insert into t2 values ('a-1030=A', 1030), ('a-1020=A', 1020);
 explain select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	5	Using where
-1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	28	test.t2.a,test.t2.b	1	Using join buffer (flat, BKA join)
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	28	test.t2.a,test.t2.b	1	Using join buffer (flat, BKA join); Key-ordered scan
 select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
 a	b	filler	a	b
 a-1010=A	1010	filler	a-1010=A	1010
@ -80,7 +80,7 @@ insert into t2 values ('a-1010=A', 1010), ('a-1030=A', 1030), ('a-1020=A', 1020)
 explain select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
-1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	30	test.t2.a,test.t2.b	1	Using index condition(BKA); Using join buffer (flat, BKA join)
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	30	test.t2.a,test.t2.b	1	Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered scan
 select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
 a	b	filler	a	b
 a-1010=A	1010	filler	a-1010=A	1010
@ -89,7 +89,7 @@ a-1030=A	1030	filler	a-1030=A	1030
 explain select * from t1, t2 where t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
-1	SIMPLE	t1	ref	PRIMARY	PRIMARY	26	test.t2.a	1	Using index condition(BKA); Using join buffer (flat, BKA join)
+1	SIMPLE	t1	ref	PRIMARY	PRIMARY	26	test.t2.a	1	Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered scan
 select * from t1, t2 where t1.a=t2.a;
 a	b	filler	a	b
 a-1010=A	1010	filler	a-1010=A	1010
@ -109,7 +109,7 @@ insert into t2 values (11,33), (11,22), (11,11);
 explain select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
-1	SIMPLE	t1	ref	PRIMARY	PRIMARY	8	test.t2.a,test.t2.b	1	Using join buffer (flat, BKA join)
+1	SIMPLE	t1	ref	PRIMARY	PRIMARY	8	test.t2.a,test.t2.b	1	Using join buffer (flat, BKA join); Key-ordered scan
 select * from t1, t2 where t1.a=t2.a and t1.b=t2.b;
 a	b	c	filler	a	b
 11	11	11	filler	11	11
@ -131,14 +131,14 @@ set join_cache_level=6;
 explain select * from t1, t2 where t1.a=t2.a and t2.b + t1.b > 100;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
-1	SIMPLE	t1	ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using index condition(BKA); Using join buffer (flat, BKA join)
+1	SIMPLE	t1	ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered scan
 select * from t1, t2 where t1.a=t2.a and t2.b + t1.b > 100;
 a	b	c	filler	a	b
 set optimizer_switch='index_condition_pushdown=off';
 explain select * from t1, t2 where t1.a=t2.a and t2.b + t1.b > 100;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	Using where
-1	SIMPLE	t1	ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t1	ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using where; Using join buffer (flat, BKA join); Key-ordered scan
 select * from t1, t2 where t1.a=t2.a and t2.b + t1.b > 100;
 a	b	c	filler	a	b
 set optimizer_switch='index_condition_pushdown=on';
--- a/mysql-test/r/join_cache.result
+++ b/mysql-test/r/join_cache.result
@ -399,7 +399,7 @@ ON City.Country=Country.Code AND City.Population > 5000000
 WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
-1	SIMPLE	City	hash_range	City_Population	#hash#$hj:City_Population	3:4	world.Country.Code	25	Using where; Using MRR; Using join buffer (flat, BNLH join)
+1	SIMPLE	City	hash_range	City_Population	#hash#$hj:City_Population	3:4	world.Country.Code	25	Using where; Rowid-ordered scan; Using join buffer (flat, BNLH join)
 SELECT Country.Name, Country.Population, City.Name, City.Population 
 FROM Country LEFT JOIN City
 ON City.Country=Country.Code AND City.Population > 5000000
@ -815,7 +815,7 @@ SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
 1	SIMPLE	City	hash_ALL	Population,Country	#hash#Country	3	world.Country.Code	4079	Using where; Using join buffer (flat, BNLH join)
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
@ -889,7 +889,7 @@ SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
 1	PRIMARY	City	hash_ALL	Population,Country	#hash#Country	3	world.Country.Code	4079	Using where; Using join buffer (flat, BNLH join)
 SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
@ -1015,7 +1015,7 @@ SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
 1	SIMPLE	City	hash_ALL	Population,Country	#hash#Country	3	world.Country.Code	4079	Using where; Using join buffer (flat, BNLH join)
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
@ -1089,7 +1089,7 @@ SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
 1	PRIMARY	City	hash_ALL	Population,Country	#hash#Country	3	world.Country.Code	4079	Using where; Using join buffer (flat, BNLH join)
 SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
@ -1209,8 +1209,8 @@ FROM Country LEFT JOIN City
 ON City.Country=Country.Code AND City.Population > 5000000
 WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	Name	Name	52	NULL	#	Using index condition; Using where; Using MRR
+1	SIMPLE	Country	range	Name	Name	52	NULL	#	Using index condition; Using where; Rowid-ordered scan
-1	SIMPLE	City	hash_range	Population,Country	#hash#Country:Population	3:4	world.Country.Code	#	Using where; Using MRR; Using join buffer (flat, BNLH join)
+1	SIMPLE	City	hash_range	Population,Country	#hash#Country:Population	3:4	world.Country.Code	#	Using where; Rowid-ordered scan; Using join buffer (flat, BNLH join)
 SELECT Country.Name, Country.Population, City.Name, City.Population 
 FROM Country LEFT JOIN City
 ON City.Country=Country.Code AND City.Population > 5000000
@ -1237,7 +1237,7 @@ ON City.Country=Country.Code AND
 (City.Population > 5000000 OR City.Name LIKE 'Za%')
 WHERE Country.Name LIKE 'C%' AND Country.Population > 10000000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	Name	Name	52	NULL	17	Using index condition; Using where; Using MRR
+1	SIMPLE	Country	range	Name	Name	52	NULL	17	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	City	hash_index_merge	Population,Country,City_Name	#hash#Country:Population,City_Name	3:4,35	world.Country.Code	96	Using sort_union(Population,City_Name); Using where; Using join buffer (flat, BNLH join)
 SELECT Country.Name, Country.Population, City.Name, City.Population
 FROM Country LEFT JOIN City 
@ -1274,8 +1274,8 @@ SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
@ -1305,8 +1305,8 @@ CountryLanguage.Percentage > 50 AND
 LENGTH(Language) < LENGTH(City.Name) - 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
-1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name, CountryLanguage.Language
 FROM City,Country,CountryLanguage
 WHERE City.Country=Country.Code AND
@ -1348,8 +1348,8 @@ SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join)
+1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
@ -1377,7 +1377,7 @@ WHERE
 Country.Population > 10000000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
-1	SIMPLE	CountryLanguage	eq_ref	PRIMARY	PRIMARY	33	world.Country.Code,const	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	CountryLanguage	eq_ref	PRIMARY	PRIMARY	33	world.Country.Code,const	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
 FROM Country LEFT JOIN CountryLanguage ON
 (CountryLanguage.Country=Country.Code AND Language='English')
@ -1471,8 +1471,8 @@ SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
@ -1502,8 +1502,8 @@ CountryLanguage.Percentage > 50 AND
 LENGTH(Language) < LENGTH(City.Name) - 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
-1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name, CountryLanguage.Language
 FROM City,Country,CountryLanguage
 WHERE City.Country=Country.Code AND
@ -1545,8 +1545,8 @@ SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join)
+1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
@ -1574,7 +1574,7 @@ WHERE
 Country.Population > 10000000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
-1	SIMPLE	CountryLanguage	eq_ref	PRIMARY	PRIMARY	33	world.Country.Code,const	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	CountryLanguage	eq_ref	PRIMARY	PRIMARY	33	world.Country.Code,const	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
 FROM Country LEFT JOIN CountryLanguage ON
 (CountryLanguage.Country=Country.Code AND Language='English')
@ -1668,8 +1668,8 @@ SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
@ -1699,8 +1699,8 @@ CountryLanguage.Percentage > 50 AND
 LENGTH(Language) < LENGTH(City.Name) - 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
-1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
-1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name, CountryLanguage.Language
 FROM City,Country,CountryLanguage
 WHERE City.Country=Country.Code AND
@ -1742,8 +1742,8 @@ SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join)
+1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
@ -1771,7 +1771,7 @@ WHERE
 Country.Population > 10000000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
-1	SIMPLE	CountryLanguage	eq_ref	PRIMARY	PRIMARY	33	world.Country.Code,const	1	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	CountryLanguage	eq_ref	PRIMARY	PRIMARY	33	world.Country.Code,const	1	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
 FROM Country LEFT JOIN CountryLanguage ON
 (CountryLanguage.Country=Country.Code AND Language='English')
@ -1865,8 +1865,8 @@ SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
@ -1896,8 +1896,8 @@ CountryLanguage.Percentage > 50 AND
 LENGTH(Language) < LENGTH(City.Name) - 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
-1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
-1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (incremental, BKAH join)
+1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name, CountryLanguage.Language
 FROM City,Country,CountryLanguage
 WHERE City.Country=Country.Code AND
@ -1939,8 +1939,8 @@ SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join)
+1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
@ -1968,7 +1968,7 @@ WHERE
 Country.Population > 10000000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	Country	ALL	NULL	NULL	NULL	NULL	239	Using where
-1	SIMPLE	CountryLanguage	eq_ref	PRIMARY	PRIMARY	33	world.Country.Code,const	1	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	CountryLanguage	eq_ref	PRIMARY	PRIMARY	33	world.Country.Code,const	1	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT Country.Name, IF(ISNULL(CountryLanguage.Country), NULL, CountryLanguage.Percentage)
 FROM Country LEFT JOIN CountryLanguage ON
 (CountryLanguage.Country=Country.Code AND Language='English')
@ -2066,7 +2066,7 @@ SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
 1	SIMPLE	City	hash_ALL	Population,Country	#hash#Country	3	world.Country.Code	4079	Using where; Using join buffer (flat, BNLH join)
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
@ -2140,7 +2140,7 @@ SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
 1	PRIMARY	City	hash_ALL	Population,Country	#hash#Country	3	world.Country.Code	4079	Using where; Using join buffer (flat, BNLH join)
 SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
@ -2170,7 +2170,7 @@ SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
 1	SIMPLE	City	hash_ALL	Population,Country	#hash#Country	3	world.Country.Code	4079	Using where; Using join buffer (flat, BNLH join)
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
@ -2244,7 +2244,7 @@ SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
 1	PRIMARY	City	hash_ALL	Population,Country	#hash#Country	3	world.Country.Code	4079	Using where; Using join buffer (flat, BNLH join)
 SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
@ -2274,8 +2274,8 @@ SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
@ -2305,8 +2305,8 @@ CountryLanguage.Percentage > 50 AND
 LENGTH(Language) < LENGTH(City.Name) - 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
-1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name, CountryLanguage.Language
 FROM City,Country,CountryLanguage
 WHERE City.Country=Country.Code AND
@ -2348,8 +2348,8 @@ SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join)
+1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
@ -2378,8 +2378,8 @@ SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
@ -2409,8 +2409,8 @@ CountryLanguage.Percentage > 50 AND
 LENGTH(Language) < LENGTH(City.Name) - 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
-1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name, CountryLanguage.Language
 FROM City,Country,CountryLanguage
 WHERE City.Country=Country.Code AND
@ -2452,8 +2452,8 @@ SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join)
+1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
@ -2482,8 +2482,8 @@ SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
@ -2513,8 +2513,8 @@ CountryLanguage.Percentage > 50 AND
 LENGTH(Language) < LENGTH(City.Name) - 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
-1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
-1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name, CountryLanguage.Language
 FROM City,Country,CountryLanguage
 WHERE City.Country=Country.Code AND
@ -2556,8 +2556,8 @@ SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join)
+1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
@ -2586,8 +2586,8 @@ SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	SIMPLE	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND 
 Country.Name LIKE 'L%' AND City.Population > 100000;
@ -2617,8 +2617,8 @@ CountryLanguage.Percentage > 50 AND
 LENGTH(Language) < LENGTH(City.Name) - 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	CountryLanguage	ALL	PRIMARY,Percentage	NULL	NULL	NULL	984	Using where
-1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.CountryLanguage.Country	1	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
-1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (incremental, BKAH join)
+1	SIMPLE	City	ref	Country	Country	3	world.CountryLanguage.Country	18	Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name, CountryLanguage.Language
 FROM City,Country,CountryLanguage
 WHERE City.Country=Country.Code AND
@ -2660,8 +2660,8 @@ SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Using MRR
+1	PRIMARY	Country	range	PRIMARY,Name	Name	52	NULL	10	Using index condition; Rowid-ordered scan
-1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join)
+1	PRIMARY	City	ref	Population,Country	Country	3	world.Country.Code	18	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT Name FROM City
 WHERE City.Country IN (SELECT Code FROM Country WHERE Country.Name LIKE 'L%') AND
 City.Population > 100000;
@ -2745,8 +2745,8 @@ EXPLAIN
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND City.Population > 3000000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population,Country	Population	4	NULL	#	Using index condition; Using MRR
+1	SIMPLE	City	range	Population,Country	Population	4	NULL	#	Using index condition; Rowid-ordered scan
-1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.City.Country	#	Using join buffer (flat, BKAH join)
+1	SIMPLE	Country	eq_ref	PRIMARY	PRIMARY	3	world.City.Country	#	Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT City.Name, Country.Name FROM City,Country
 WHERE City.Country=Country.Code AND City.Population > 3000000;
 Name	Name
@ -3035,15 +3035,15 @@ t1.metaid = t2.metaid AND t1.affiliateid = '2';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t6	system	PRIMARY	NULL	NULL	NULL	1	
 1	SIMPLE	t1	ref	t1_affiliateid,t1_metaid	t1_affiliateid	4	const	1	
-1	SIMPLE	t4	ref	PRIMARY,t4_formatclassid,t4_formats_idx	t4_formats_idx	1	const	1	Using index condition; Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t4	ref	PRIMARY,t4_formatclassid,t4_formats_idx	t4_formats_idx	1	const	1	Using index condition; Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t5	eq_ref	PRIMARY,t5_formattypeid	PRIMARY	4	test.t4.formatclassid	1	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t5	eq_ref	PRIMARY,t5_formattypeid	PRIMARY	4	test.t4.formatclassid	1	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.metaid	1	Using join buffer (incremental, BKA join)
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.metaid	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t7	ref	PRIMARY	PRIMARY	4	test.t1.metaid	1	Using index
-1	SIMPLE	t3	ref	t3_metaid,t3_formatid,t3_metaidformatid	t3_metaid	4	test.t1.metaid	2	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t3	ref	t3_metaid,t3_formatid,t3_metaidformatid	t3_metaid	4	test.t1.metaid	2	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t8	eq_ref	PRIMARY	PRIMARY	4	test.t7.artistid	1	Using join buffer (incremental, BKA join)
+1	SIMPLE	t8	eq_ref	PRIMARY	PRIMARY	4	test.t7.artistid	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t9	index	PRIMARY,t9_subgenreid,t9_metaid	PRIMARY	8	NULL	2	Using where; Using index; Using join buffer (incremental, BNL join)
-1	SIMPLE	t10	eq_ref	PRIMARY,t10_genreid	PRIMARY	4	test.t9.subgenreid	1	Using join buffer (incremental, BKA join)
+1	SIMPLE	t10	eq_ref	PRIMARY,t10_genreid	PRIMARY	4	test.t9.subgenreid	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t11	eq_ref	PRIMARY	PRIMARY	4	test.t10.genreid	1	Using join buffer (incremental, BKA join)
+1	SIMPLE	t11	eq_ref	PRIMARY	PRIMARY	4	test.t10.genreid	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 SELECT t1.uniquekey, t1.xml AS affiliateXml,
 t8.name AS artistName, t8.artistid, 
 t11.name AS genreName, t11.genreid, t11.priority AS genrePriority,
@ -3124,7 +3124,7 @@ FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	9	Using where
 1	SIMPLE	t2	ref	PRIMARY	PRIMARY	4	test.t1.a1	1	Using index
-1	SIMPLE	t3	ref	idx	idx	5	test.t2.b2	5	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t3	ref	idx	idx	5	test.t2.b2	5	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT a1<>a2, a1, a2, b2, b3, c3,
 SUBSTR(filler1,1,1) AS s1, SUBSTR(filler2,1,1) AS s2
 FROM t1,t2,t3 WHERE a1=a2 AND b2=b3 AND MOD(c3,10)>7;
@ -3156,7 +3156,7 @@ set join_cache_level=8;
 EXPLAIN SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	idx	NULL	NULL	NULL	7	Using where
-1	SIMPLE	t2	ref	idx	idx	5	test.t1.a	2	Using join buffer (flat, BKAH join)
+1	SIMPLE	t2	ref	idx	idx	5	test.t1.a	2	Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT * FROM t1,t2 WHERE t1.a=t2.a AND t1.b >= 30;
 a	b	a	b
 7	40	7	10
@ -3189,7 +3189,7 @@ EXPLAIN
 SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
-1	SIMPLE	t2	ref	i_a	i_a	4	test.t1.a	2	Using where; Not exists; Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	i_a	i_a	4	test.t1.a	2	Using where; Not exists; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT * FROM t1 LEFT JOIN t2 ON t1.a=t2.a WHERE t2.b IS NULL;
 a	a	b
 3	NULL	NULL
@ -3216,7 +3216,7 @@ select t1.a, count(t2.p) as count
 from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	8	Using temporary; Using filesort
-1	SIMPLE	t2	ref	i_a	i_a	5	test.t1.a	2	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	i_a	i_a	5	test.t1.a	2	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 select t1.a, count(t2.p) as count
 from t1 left join t2 on t1.a=t2.a and t2.p % 2 = 1 group by t1.a;
 a	count
@ -3335,7 +3335,7 @@ set join_buffer_size=1024;
 EXPLAIN SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2050	Using where
-1	SIMPLE	t2	ref	idx	idx	5	test.t1.a	640	Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	idx	idx	5	test.t1.a	640	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT AVG(c) FROM t1,t2 WHERE t1.a=t2.b;
 AVG(c)
 5.0000
@ -3375,8 +3375,8 @@ WHERE t1.a=t2.a AND t2.a=t3.a AND
 t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	PRIMARY	NULL	NULL	NULL	16384	Using where
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT COUNT(*) FROM t1,t2,t3
 WHERE t1.a=t2.a AND t2.a=t3.a AND
 t1.b IS NULL AND t2.b IS NULL AND t3.b IS NULL;
@ -3441,7 +3441,7 @@ WHERE t1.a=t2.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	index	PRIMARY	PRIMARY	8	NULL	2	Using index
 1	SIMPLE	t2	ref	PRIMARY	PRIMARY	8	test.t1.a	1	Using index
-1	SIMPLE	t3	ref	idx	idx	16	test.t1.a,test.t2.b	2	Using join buffer (flat, BKA join)
+1	SIMPLE	t3	ref	idx	idx	16	test.t1.a,test.t2.b	2	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT t1.a, t2.a, t3.a, t2.b, t3.b, t3.val 
 FROM (t1,t2) LEFT JOIN t3 ON (t1.a=t3.a AND t2.b=t3.b) 
 WHERE t1.a=t2.a;
@ -3512,7 +3512,7 @@ explain select t2.f1, t2.f2, t2.f3 from t1,t2
 where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
-1	SIMPLE	t2	ref	f1	f1	4	test.t1.f1	3	Using index condition(BKA); Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	f1	f1	4	test.t1.f1	3	Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 set join_cache_level=6;
 select t2.f1, t2.f2, t2.f3 from t1,t2
 where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
@ -3525,7 +3525,7 @@ explain select t2.f1, t2.f2, t2.f3 from t1,t2
 where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
-1	SIMPLE	t2	ref	f1	f1	4	test.t1.f1	3	Using index condition(BKA); Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	f1	f1	4	test.t1.f1	3	Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 set join_cache_level=7;
 select t2.f1, t2.f2, t2.f3 from t1,t2
 where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
@ -3538,7 +3538,7 @@ explain select t2.f1, t2.f2, t2.f3 from t1,t2
 where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
-1	SIMPLE	t2	ref	f1	f1	4	test.t1.f1	3	Using index condition(BKA); Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	t2	ref	f1	f1	4	test.t1.f1	3	Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 set join_cache_level=8;
 select t2.f1, t2.f2, t2.f3 from t1,t2
 where t1.f1=t2.f1 and t2.f2 between t1.f1 and t1.f2 and t2.f2 + 1 >= t1.f1 + 1;
@ -3551,7 +3551,7 @@ explain select t2.f1, t2.f2, t2.f3 from t1,t2
 where t1.f1=t2.f1 and t2.f2 between t1.f1 and t2.f2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
-1	SIMPLE	t2	ref	f1	f1	4	test.t1.f1	3	Using index condition(BKA); Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	t2	ref	f1	f1	4	test.t1.f1	3	Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 drop table t1,t2;
 set join_cache_level=default;
 #
@ -3570,7 +3570,7 @@ select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1
 where t1.d=3 group by t1.id1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	idx1	idx1	5	const	4	Using where; Using index; Using temporary; Using filesort
-1	SIMPLE	t2	ref	idx2	idx2	5	test.t1.id1	2	Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	idx2	idx2	5	test.t1.id1	2	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 select t1.id1, sum(t2.id2) from t1 join t2 on t1.id1=t2.id1 
 where t1.d=3 group by t1.id1;
 id1	sum(t2.id2)
@ -3582,7 +3582,7 @@ select t1.id1  from t1 join t2 on t1.id1=t2.id1
 where t1.d=3 and t2.id2 > 200 order by t1.id1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	idx1	idx1	5	const	4	Using where; Using index; Using temporary; Using filesort
-1	SIMPLE	t2	ref	idx2	idx2	5	test.t1.id1	2	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	idx2	idx2	5	test.t1.id1	2	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 select t1.id1  from t1 join t2 on t1.id1=t2.id1 
 where t1.d=3 and t2.id2 > 200 order by t1.id1;
 id1
@ -3639,9 +3639,9 @@ select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
 where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	7	Using where
-1	SIMPLE	t2	ref	idx	idx	5	test.t1.b	1	Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	idx	idx	5	test.t1.b	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t3	ref	idx	idx	5	test.t1.d	1	Using join buffer (incremental, BKA join)
+1	SIMPLE	t3	ref	idx	idx	5	test.t1.d	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t4	ref	idx	idx	5	test.t1.c	1	Using join buffer (incremental, BKA join)
+1	SIMPLE	t4	ref	idx	idx	5	test.t1.c	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 select t1.a, t1.b, t1.c, t1.d, t2.e, t3.f, t4.g from t1,t2,t3,t4
 where t2.b=t1.b and t3.d=t1.d and t4.c=t1.c;
 a	b	c	d	e	f	g
@ -3690,10 +3690,10 @@ WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and  t4.id2=t1.id2 AND
 t5.enum2='Active' AND t3.id4=t2.id4 AND t2.id3=t1.id3 AND t3.text1<'D';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	349	Using where
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	8	test.t1.id3	1	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	8	test.t1.id3	1	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	8	test.t2.id4	1	Using where; Using join buffer (incremental, BKAH join)
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	8	test.t2.id4	1	Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	8	test.t1.id2	1	Using join buffer (incremental, BKAH join)
+1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	8	test.t1.id2	1	Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	16	test.t1.id1,test.t1.id2	1	Using where; Using join buffer (incremental, BKAH join)
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	16	test.t1.id1,test.t1.id2	1	Using where; Using join buffer (incremental, BKAH join); Key-ordered Rowid-ordered scan
 SELECT STRAIGHT_JOIN t1.id1, t1.num3, t3.text1, t3.id4, t2.id3, t4.dummy
 FROM t1 JOIN  t2 JOIN  t3 JOIN  t4 JOIN  t5 
 WHERE t1.id1=t5.id1 AND t1.id2=t5.id2 and  t4.id2=t1.id2 AND
@ -3906,7 +3906,7 @@ SELECT t3.a FROM t1,t2,t3 WHERE t1.a = t3.a AND t1.b = t3.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	5	Using join buffer (flat, BNL join)
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 SELECT t3.a FROM t1,t2,t3 WHERE t1.a = t3.a AND t1.b = t3.b;
 a
 27
@ -3968,7 +3968,7 @@ set join_cache_level = 5;
 explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b  = t1.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	SIMPLE	t2	ref	b	b	5	test.t1.b	2	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	b	b	5	test.t1.b	2	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b  = t1.b;
 a
 NULL
@ -3977,7 +3977,7 @@ set join_cache_level = 8;
 explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b  = t1.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	SIMPLE	t2	ref	b	b	5	test.t1.b	2	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	t2	ref	b	b	5	test.t1.b	2	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b  = t1.b;
 a
 NULL
@ -3988,7 +3988,7 @@ set join_cache_level = 5;
 explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b  = t1.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	SIMPLE	t2	ref	b	b	5	test.t1.b	2	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	b	b	5	test.t1.b	2	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b  = t1.b;
 a
 NULL
@ -4002,7 +4002,7 @@ set join_cache_level = 5;
 explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b  = t1.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	SIMPLE	t2	ref	b	b	103	test.t1.b	2	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	b	b	103	test.t1.b	2	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b  = t1.b;
 a
 NULL
@ -4011,7 +4011,7 @@ set join_cache_level = 8;
 explain SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b  = t1.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
-1	SIMPLE	t2	ref	b	b	103	test.t1.b	2	Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	t2	ref	b	b	103	test.t1.b	2	Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT t2.a FROM t1 LEFT JOIN t2 ON t2.b  = t1.b;
 a
 NULL
@ -4037,7 +4037,7 @@ SELECT t.a FROM t1 t, t1 s FORCE INDEX(idx)
 WHERE s.pk AND s.a  >= t.pk AND  s.b  = t.c;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t	ALL	NULL	NULL	NULL	NULL	2	Using where
-1	SIMPLE	s	ref	idx	idx	19	test.t.c	1	Using index condition(BKA); Using where; Using join buffer (flat, BKAH join)
+1	SIMPLE	s	ref	idx	idx	19	test.t.c	1	Using index condition(BKA); Using where; Using join buffer (flat, BKAH join); Key-ordered Rowid-ordered scan
 SELECT t.a FROM t1 t, t1 s FORCE INDEX(idx)
 WHERE s.pk AND s.a  >= t.pk AND  s.b  = t.c;
 a
@ -4229,8 +4229,8 @@ SELECT t2.v FROM t1, t2, t3 WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v
 GROUP BY t2.v ORDER BY t1.pk,t2.v;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	idx1	NULL	NULL	NULL	20	Using temporary; Using filesort
-1	SIMPLE	t3	eq_ref	PRIMARY,idx2	PRIMARY	4	test.t2.i	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t3	eq_ref	PRIMARY,idx2	PRIMARY	4	test.t2.i	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t1	ref	idx2	idx2	3	test.t3.v	2	Using join buffer (incremental, BKA join)
+1	SIMPLE	t1	ref	idx2	idx2	3	test.t3.v	2	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 SELECT t2.v FROM t1, t2, t3 WHERE t3.v <> t2.v AND t3.pk = t2.i AND t1.v = t3.v 
 GROUP BY t2.v ORDER BY t1.pk,t2.v;
 v
@ -4700,7 +4700,7 @@ SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	
 1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	1	Using where; Using join buffer (flat, BNL join)
-1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.a2	1	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.a2	1	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 SELECT * FROM t1 LEFT JOIN t2 JOIN t3 ON t3.a3 = t2.a2 ON t3.b3 <> 0;
 a1	a2	b2	a3	b3
 0	2	1	2	1
@ -4761,7 +4761,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	1	Using where
 1	SIMPLE	t3	eq_ref	PRIMARY	PRIMARY	4	test.t2.a2	1	Using index
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	1	Using where; Using join buffer (flat, BNL join)
-1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t2.a2	1	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t5	eq_ref	PRIMARY	PRIMARY	4	test.t2.a2	1	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 SELECT t4.a4, t5.b5 
 FROM ((t1 LEFT JOIN (t2 JOIN t3 ON t2.a2 = t3.a3) ON t2.b2 = t1.a1)
 LEFT JOIN t4 ON t4.a4 <> 0) LEFT JOIN t5 ON t5.a5 = t2.a2;
@ -4819,8 +4819,8 @@ EXPLAIN
 SELECT * FROM t1,t2
 WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	2	Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	2	Using where; Rowid-ordered scan
-1	SIMPLE	t2	range	PRIMARY	PRIMARY	4	NULL	2	Using where; Using MRR; Using join buffer (flat, BNL join)
+1	SIMPLE	t2	range	PRIMARY	PRIMARY	4	NULL	2	Using where; Rowid-ordered scan; Using join buffer (flat, BNL join)
 SELECT * FROM t1,t2
 WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6);
 f1	f3	f3	f2	f4
@ -4829,8 +4829,8 @@ EXPLAIN
 SELECT * FROM t1,t2
 WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Rowid-ordered scan
-1	SIMPLE	t2	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Using where; Using MRR; Using join buffer (flat, BNL join)
+1	SIMPLE	t2	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Using where; Rowid-ordered scan; Using join buffer (flat, BNL join)
 SELECT * FROM t1,t2
 WHERE t1.f1 = t2.f4 AND (t1.f3 = 1 AND t2.f3 = 4 OR t1.f3 = 2 AND t2.f3 = 6);
 f1	f3	f3	f2	f4
@ -4902,7 +4902,7 @@ EXPLAIN
 SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	Using where; Using index
-1	SIMPLE	t2	hash_range	idx	#hash#idx:idx	5:5	const	4	Using index condition; Using MRR; Using join buffer (flat, BNLH join)
+1	SIMPLE	t2	hash_range	idx	#hash#idx:idx	5:5	const	4	Using index condition; Rowid-ordered scan; Using join buffer (flat, BNLH join)
 SELECT * FROM t1,t2 WHERE t1.a < 3 and t2.a IS NULL;
 a	a	b
 1	NULL	10
--- a/mysql-test/r/join_nested_jcl6.result
+++ b/mysql-test/r/join_nested_jcl6.result
@ -858,7 +858,7 @@ 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	filtered	Extra
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	2	100.00	Using join buffer (flat, BNL join)
-1	SIMPLE	t2	ref	idx_b	idx_b	5	test.t3.b	2	100.00	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t2	ref	idx_b	idx_b	5	test.t3.b	2	100.00	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using join buffer (incremental, BNL join)
 Warnings:
 Note	1003	select `test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b` from `test`.`t3` join `test`.`t4` left join (`test`.`t1` join `test`.`t2`) on((((`test`.`t3`.`a` = 1) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) and (`test`.`t2`.`b` = `test`.`t3`.`b`))) and (`test`.`t3`.`b` is not null))) where 1
@ -966,7 +966,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	t1	hash_ALL	NULL	#hash#$hj	5	test.t0.b	3	100.00	Using where; Using join buffer (flat, BNLH join)
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (incremental, BNL join)
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer (incremental, BNL join)
-1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	100.00	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	100.00	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (incremental, BNL join)
 1	SIMPLE	t7	hash_ALL	NULL	#hash#$hj	5	test.t5.b	2	100.00	Using where; Using join buffer (incremental, BNLH join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (incremental, BNL join)
@ -1015,11 +1015,11 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	t1	hash_ALL	NULL	#hash#$hj	5	test.t0.b	3	100.00	Using where; Using join buffer (flat, BNLH join)
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (incremental, BNL join)
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer (incremental, BNL join)
-1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	100.00	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	100.00	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (incremental, BNL join)
 1	SIMPLE	t7	hash_ALL	NULL	#hash#$hj	5	test.t5.b	2	100.00	Using where; Using join buffer (incremental, BNLH join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (incremental, BNL join)
-1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t5.b	2	100.00	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t5.b	2	100.00	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (incremental, BNL join)
 Warnings:
 Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on((((`test`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on((((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t5`.`b` = `test`.`t0`.`b`)) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
@ -1062,14 +1062,14 @@ t0.b=t1.b AND
 (t9.a=1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	SIMPLE	t0	ref	idx_a	idx_a	5	const	1	100.00	Using where
-1	SIMPLE	t1	ref	idx_b	idx_b	5	test.t0.b	2	100.00	Using join buffer (flat, BKA join)
+1	SIMPLE	t1	ref	idx_b	idx_b	5	test.t0.b	2	100.00	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (incremental, BNL join)
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer (incremental, BNL join)
-1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	100.00	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t4	ref	idx_b	idx_b	5	test.t2.b	2	100.00	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t5	ALL	idx_b	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (incremental, BNL join)
 1	SIMPLE	t7	hash_ALL	NULL	#hash#$hj	5	test.t5.b	2	100.00	Using where; Using join buffer (incremental, BNLH join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (incremental, BNL join)
-1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t7.b	2	100.00	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t8	ref	idx_b	idx_b	5	test.t7.b	2	100.00	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t9	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where; Using join buffer (incremental, BNL join)
 Warnings:
 Note	1003	select `test`.`t0`.`a` AS `a`,`test`.`t0`.`b` AS `b`,`test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b`,`test`.`t2`.`a` AS `a`,`test`.`t2`.`b` AS `b`,`test`.`t3`.`a` AS `a`,`test`.`t3`.`b` AS `b`,`test`.`t4`.`a` AS `a`,`test`.`t4`.`b` AS `b`,`test`.`t5`.`a` AS `a`,`test`.`t5`.`b` AS `b`,`test`.`t6`.`a` AS `a`,`test`.`t6`.`b` AS `b`,`test`.`t7`.`a` AS `a`,`test`.`t7`.`b` AS `b`,`test`.`t8`.`a` AS `a`,`test`.`t8`.`b` AS `b`,`test`.`t9`.`a` AS `a`,`test`.`t9`.`b` AS `b` from `test`.`t0` join `test`.`t1` left join (`test`.`t2` left join (`test`.`t3` join `test`.`t4`) on((((`test`.`t3`.`a` = 1) and (`test`.`t4`.`b` = `test`.`t2`.`b`)) and (`test`.`t2`.`b` is not null))) join `test`.`t5` left join (`test`.`t6` join `test`.`t7` left join `test`.`t8` on((((`test`.`t6`.`b` < 10) and ((`test`.`t7`.`b` = `test`.`t5`.`b`) and (`test`.`t8`.`b` = `test`.`t5`.`b`))) and (`test`.`t7`.`b` is not null)))) on((((`test`.`t6`.`b` >= 2) and (`test`.`t7`.`b` = `test`.`t5`.`b`)) and (`test`.`t5`.`b` is not null)))) on((((`test`.`t3`.`b` = 2) or isnull(`test`.`t3`.`c`)) and ((`test`.`t6`.`b` = 2) or isnull(`test`.`t6`.`c`)) and (((`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t5`.`b` = `test`.`t0`.`b`)) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t6`.`c`) or isnull(`test`.`t8`.`c`)) and (`test`.`t1`.`a` <> 2))) join `test`.`t9` where ((`test`.`t9`.`a` = 1) and (`test`.`t1`.`b` = `test`.`t0`.`b`) and (`test`.`t0`.`a` = 1) and ((`test`.`t2`.`a` >= 4) or isnull(`test`.`t2`.`c`)) and ((`test`.`t3`.`a` < 5) or isnull(`test`.`t3`.`c`)) and ((`test`.`t4`.`b` = `test`.`t3`.`b`) or isnull(`test`.`t3`.`c`) or isnull(`test`.`t4`.`c`)) and ((`test`.`t5`.`a` >= 2) or isnull(`test`.`t5`.`c`)) and ((`test`.`t6`.`a` >= 4) or isnull(`test`.`t6`.`c`)) and ((`test`.`t7`.`a` <= 2) or isnull(`test`.`t7`.`c`)) and ((`test`.`t8`.`a` < 1) or isnull(`test`.`t8`.`c`)) and ((`test`.`t9`.`b` = `test`.`t8`.`b`) or isnull(`test`.`t8`.`c`)))
@ -1452,27 +1452,27 @@ explain select * from t4 join
 t2 left join (t3 join t5 on t5.a=t3.b) on t3.a=t2.b where t4.a<=>t3.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	X	
-1	SIMPLE	t3	ref	a	a	5	test.t2.b	X	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t3	ref	a	a	5	test.t2.b	X	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t5	ref	a	a	5	test.t3.b	X	Using join buffer (incremental, BKA join)
+1	SIMPLE	t5	ref	a	a	5	test.t3.b	X	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t4	ref	a	a	5	test.t3.b	X	Using index condition(BKA); Using join buffer (incremental, BKA join)
+1	SIMPLE	t4	ref	a	a	5	test.t3.b	X	Using index condition(BKA); Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 explain select * from (t4 join t6 on t6.a=t4.b) right join t3 on t4.a=t3.b
 join t2 left join (t5 join t7 on t7.a=t5.b) on t5.a=t2.b where t3.a<=>t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	X	
-1	SIMPLE	t3	ref	a	a	5	test.t2.b	X	Using index condition(BKA); Using join buffer (flat, BKA join)
+1	SIMPLE	t3	ref	a	a	5	test.t2.b	X	Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t4	ref	a	a	5	test.t3.b	X	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t4	ref	a	a	5	test.t3.b	X	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t6	ref	a	a	5	test.t4.b	X	Using join buffer (incremental, BKA join)
+1	SIMPLE	t6	ref	a	a	5	test.t4.b	X	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t5	ref	a	a	5	test.t2.b	X	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t5	ref	a	a	5	test.t2.b	X	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t7	ref	a	a	5	test.t5.b	X	Using join buffer (incremental, BKA join)
+1	SIMPLE	t7	ref	a	a	5	test.t5.b	X	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 explain select * from t2 left join
 (t3 left join (t4 join t6 on t6.a=t4.b) on t4.a=t3.b 
 join t5 on t5.a=t3.b) on t3.a=t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	X	
-1	SIMPLE	t3	ref	a	a	5	test.t2.b	X	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t3	ref	a	a	5	test.t2.b	X	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t5	ref	a	a	5	test.t3.b	X	Using join buffer (incremental, BKA join)
+1	SIMPLE	t5	ref	a	a	5	test.t3.b	X	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t4	ref	a	a	5	test.t5.a	X	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t4	ref	a	a	5	test.t5.a	X	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t6	ref	a	a	5	test.t4.b	X	Using join buffer (incremental, BKA join)
+1	SIMPLE	t6	ref	a	a	5	test.t4.b	X	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 drop table t0, t1, t2, t3, t4, t5, t6, t7;
 create table t1 (a int);
 insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
@ -1485,8 +1485,8 @@ explain select * from t1 left join
 on (t1.a = t2.a);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	10	
-1	SIMPLE	t2	ref	a	a	5	test.t1.a	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	a	a	5	test.t1.a	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t3	ref	a	a	5	test.t1.a	1	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t3	ref	a	a	5	test.t1.a	1	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 drop table t1, t2, t3;
 CREATE TABLE t1 (id int NOT NULL PRIMARY KEY, type varchar(10));
 CREATE TABLE t2 (pid int NOT NULL PRIMARY KEY, type varchar(10));
@ -1737,7 +1737,7 @@ LEFT JOIN
 ON t4.carrier = t1.carrier;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	index	package_id	package_id	5	NULL	45	Using where; Using index
-1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.package_id	1	Using join buffer (flat, BKA join)
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.package_id	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t4	eq_ref	PRIMARY,id	PRIMARY	2	test.t1.carrier	1	Using where
 1	SIMPLE	t5	ref	carrier_id	carrier_id	5	test.t4.id	22	Using index
 1	SIMPLE	t3	ref	package_id	package_id	5	test.t2.package_id	1	Using index
@ -1831,9 +1831,9 @@ ON t6.b >= 2 AND t5.b=t7.b AND
 (t8.a > 0 OR t8.c IS NULL);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	3	
-1	SIMPLE	t7	ref	b_i	b_i	5	test.t5.b	2	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t7	ref	b_i	b_i	5	test.t5.b	2	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t6	ALL	b_i	NULL	NULL	NULL	3	Using where; Using join buffer (incremental, BNL join)
-1	SIMPLE	t8	ref	b_i	b_i	5	test.t5.b	2	Using where; Using join buffer (incremental, BKA join)
+1	SIMPLE	t8	ref	b_i	b_i	5	test.t5.b	2	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
 FROM t5 
 LEFT JOIN 
@ -1867,7 +1867,7 @@ ON (t5.b=t8.b);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	2	
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (flat, BNL join)
-1	SIMPLE	t7	const	PRIMARY	PRIMARY	4	const	1	Using join buffer (incremental, BKA join)
+1	SIMPLE	t7	const	PRIMARY	PRIMARY	4	const	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t8	ALL	b_i	NULL	NULL	NULL	1	Using where; Using join buffer (incremental, BNL join)
 SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
 FROM t5 LEFT JOIN                
@ -1884,7 +1884,7 @@ ON (t5.b=t8.b);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	2	
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (flat, BNL join)
-1	SIMPLE	t7	ref	b_i	b_i	5	const	0	Using join buffer (incremental, BKA join)
+1	SIMPLE	t7	ref	b_i	b_i	5	const	0	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t8	ALL	b_i	NULL	NULL	NULL	1	Using where; Using join buffer (incremental, BNL join)
 SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
 FROM t5 LEFT JOIN                
@ -1902,7 +1902,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	2	
 1	SIMPLE	t8	ALL	b_i	NULL	NULL	NULL	1	Using where; Using join buffer (flat, BNL join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	1	Using join buffer (incremental, BNL join)
-1	SIMPLE	t7	const	PRIMARY	PRIMARY	4	const	1	Using join buffer (incremental, BKA join)
+1	SIMPLE	t7	const	PRIMARY	PRIMARY	4	const	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 SELECT t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b
 FROM t5 LEFT JOIN                
 (t8, t6 LEFT JOIN t7 ON t7.a=1)
--- a/mysql-test/r/join_outer_jcl6.result
+++ b/mysql-test/r/join_outer_jcl6.result
@ -102,7 +102,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 explain select t1.*,t2.* from t1 left join t2 on t1.a=t2.a where isnull(t2.a)=1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	7	
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	8	test.t1.a	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	8	test.t1.a	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 select t1.*,t2.*,t3.a from t1 left join t2 on (t1.a=t2.a) left join t1 as t3 on (t2.a=t3.a);
 grp	a	c	id	a	c	d	a
 1	1	a	1	1	a	1	1
@ -745,13 +745,13 @@ explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from
 order by m.match_id desc;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	s	ALL	NULL	NULL	NULL	NULL	10	Using temporary; Using filesort
-1	SIMPLE	m	const	match_id,match_id_2	match_id	1	const	1	Using join buffer (flat, BKA join)
+1	SIMPLE	m	const	match_id,match_id_2	match_id	1	const	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 explain select s.*, '*', m.*, (s.match_1_h - m.home) UUX from 
 (t2 s left join t1 m on m.match_id = 1) 
 order by UUX desc;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	s	ALL	NULL	NULL	NULL	NULL	10	Using temporary; Using filesort
-1	SIMPLE	m	const	match_id,match_id_2	match_id	1	const	1	Using join buffer (flat, BKA join)
+1	SIMPLE	m	const	match_id,match_id_2	match_id	1	const	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 select s.*, '*', m.*, (s.match_1_h - m.home) UUX from 
 (t2 s left join t1 m on m.match_id = 1) 
 order by UUX desc;
@ -771,7 +771,7 @@ t2 s straight_join t1 m where m.match_id = 1
 order by UUX desc;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	s	ALL	NULL	NULL	NULL	NULL	10	Using temporary; Using filesort
-1	SIMPLE	m	const	match_id,match_id_2	match_id	1	const	1	Using join buffer (flat, BKA join)
+1	SIMPLE	m	const	match_id,match_id_2	match_id	1	const	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 select s.*, '*', m.*, (s.match_1_h - m.home) UUX from 
 t2 s straight_join t1 m where m.match_id = 1 
 order by UUX desc;
@ -1134,15 +1134,15 @@ a	b	a	b
 EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a = t2.a OR t1.a = t2.b;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	4	
-1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using join buffer (flat, BKA join)
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a IN(t2.a, t2.b);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	4	Using where
-1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using join buffer (flat, BKA join)
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 LEFT JOIN t2 ON t1.a = t2.a WHERE t1.a > IF(t1.a = t2.b-2, t2.b, t2.b-1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	PRIMARY	NULL	NULL	NULL	4	Using where
-1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using join buffer (flat, BKA join)
+1	SIMPLE	t1	eq_ref	PRIMARY	PRIMARY	4	test.t2.a	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 DROP TABLE t1,t2;
 DROP VIEW IF EXISTS v1,v2;
 DROP TABLE IF EXISTS t1,t2;
@ -1231,7 +1231,7 @@ EXPLAIN
 SELECT t1.id, a FROM t1 LEFT JOIN t2 ON t1.id=t2.id WHERE t2.b IS NULL;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
-1	SIMPLE	t2	ref	idx	idx	4	test.t1.id	2	Using where; Not exists; Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	idx	idx	4	test.t1.id	2	Using where; Not exists; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 flush status;
 SELECT t1.id, a FROM t1 LEFT JOIN t2 ON t1.id=t2.id WHERE t2.b IS NULL;
 id	a
--- a/mysql-test/r/key_cache.result
+++ b/mysql-test/r/key_cache.result
@ -628,7 +628,7 @@ select p from t1 where p between 1010 and 1020;
 p
 explain select i from t2 where p between 1010 and 1020;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	range	PRIMARY	PRIMARY	4	NULL	28	Using index condition; Using MRR
+1	SIMPLE	t2	range	PRIMARY	PRIMARY	4	NULL	28	Using index condition; Rowid-ordered scan
 select i from t2 where p between 1010 and 1020;
 i
 1
--- a/mysql-test/r/maria_mrr.result
+++ b/mysql-test/r/maria_mrr.result
@ -185,7 +185,7 @@ explain
 select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1'
                                                      or c='no-such-row2');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	range	idx1	idx1	29	NULL	16	Using index condition; Using MRR
+1	SIMPLE	t4	range	idx1	idx1	29	NULL	16	Using index condition; Rowid-ordered scan
 select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1'
                                                    or c='no-such-row2');
 a	b	c	filler
@ -207,7 +207,7 @@ NULL	NULL	NULL	NULL-1
 explain 
 select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	range	idx1	idx1	29	NULL	32	Using index condition; Using MRR
+1	SIMPLE	t4	range	idx1	idx1	29	NULL	32	Using index condition; Rowid-ordered scan
 select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2');
 a	b	c	filler
 b-1	NULL	c-1	NULL-15
@ -395,7 +395,7 @@ WHERE
 table1.col_varchar_1024_latin1_key = table2.col_varchar_10_latin1 AND table1.pk<>0 ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	table2	ALL	NULL	NULL	NULL	NULL	2	Using where
-1	SIMPLE	table1	ref	PRIMARY,col_varchar_1024_latin1_key	col_varchar_1024_latin1_key	1027	test.table2.col_varchar_10_latin1	2	Using index condition(BKA); Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	table1	ref	PRIMARY,col_varchar_1024_latin1_key	col_varchar_1024_latin1_key	1027	test.table2.col_varchar_10_latin1	2	Using index condition(BKA); Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT count(*)
 FROM t1 AS table1, t2 AS table2
 WHERE
--- a/mysql-test/r/merge.result
+++ b/mysql-test/r/merge.result
@ -673,7 +673,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN SELECT * FROM t1 WHERE fileset_id = 2
 AND file_code BETWEEN '0000000115' AND '0000000120' LIMIT 1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY,files	PRIMARY	35	NULL	5	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY,files	PRIMARY	35	NULL	5	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t2 WHERE fileset_id = 2
 AND file_code = '0000000115' LIMIT 1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
--- a/mysql-test/r/mix2_myisam.result
+++ b/mysql-test/r/mix2_myisam.result
@ -1114,11 +1114,11 @@ count(*)
 29267
 explain select * from t1 where c between 1 and 2500;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c	c	5	NULL	#	Using index condition; Using MRR
+1	SIMPLE	t1	range	c	c	5	NULL	#	Using index condition; Rowid-ordered scan
 update t1 set c=a;
 explain select * from t1 where c between 1 and 2500;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	c	c	5	NULL	#	Using index condition; Using MRR
+1	SIMPLE	t1	range	c	c	5	NULL	#	Using index condition; Rowid-ordered scan
 drop table t1,t2;
 create table t1 (id int primary key auto_increment, fk int, index index_fk (fk)) engine=MyISAM;
 insert into t1 (id) values (null),(null),(null),(null),(null);
--- a/mysql-test/r/myisam.result
+++ b/mysql-test/r/myisam.result
@ -368,7 +368,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	5	Using where
 explain select * from t1 force index (a) where a=0 or a=2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	a	a	4	NULL	4	Using index condition; Using MRR
+1	SIMPLE	t1	range	a	a	4	NULL	4	Using index condition; Rowid-ordered scan
 explain select * from t1 where c=1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	c,c_2	c	5	const	1	
--- a/mysql-test/r/myisam_mrr.result
+++ b/mysql-test/r/myisam_mrr.result
@ -186,7 +186,7 @@ explain
 select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1'
                                                      or c='no-such-row2');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	range	idx1	idx1	29	NULL	10	Using index condition; Using MRR
+1	SIMPLE	t4	range	idx1	idx1	29	NULL	10	Using index condition; Rowid-ordered scan
 select * from t4 where a IS NULL and b IS NULL and (c IS NULL or c='no-such-row1'
                                                    or c='no-such-row2');
 a	b	c	filler
@ -208,7 +208,7 @@ NULL	NULL	NULL	NULL-1
 explain 
 select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t4	range	idx1	idx1	29	NULL	21	Using index condition; Using MRR
+1	SIMPLE	t4	range	idx1	idx1	29	NULL	21	Using index condition; Rowid-ordered scan
 select * from t4 where (a ='b-1' or a='bb-1') and b IS NULL and (c='c-1' or c='cc-2');
 a	b	c	filler
 b-1	NULL	c-1	NULL-15
@ -403,16 +403,16 @@ insert into t1 select A.a + 10 *(B.a + 10*C.a), A.a + 10 *(B.a + 10*C.a) from t0
 A query that will use ICP: 
 explain select * from t1 where a < 20;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	a	a	5	NULL	20	Using index condition; Using MRR
+1	SIMPLE	t1	range	a	a	5	NULL	20	Using index condition; Rowid-ordered scan
 set @save_optimizer_switch=@@optimizer_switch;
 set optimizer_switch='index_condition_pushdown=off';
 explain select * from t1 where a < 20;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	a	a	5	NULL	20	Using where; Using MRR
+1	SIMPLE	t1	range	a	a	5	NULL	20	Using where; Rowid-ordered scan
 set optimizer_switch='index_condition_pushdown=on';
 explain select * from t1 where a < 20;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	a	a	5	NULL	20	Using index condition; Using MRR
+1	SIMPLE	t1	range	a	a	5	NULL	20	Using index condition; Rowid-ordered scan
 set optimizer_switch=@save_optimizer_switch;
 # 
 # BUG#629684: Unreachable code in multi_range_read.cc in maria-5.3-dsmrr-cpk
@ -426,7 +426,7 @@ explain
 select * from t0, t1 where t0.a<=>t1.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t0	ALL	NULL	NULL	NULL	NULL	5	
-1	SIMPLE	t1	ref	a	a	5	test.t0.a	1	Using index condition(BKA); Using join buffer (flat, BKA join)
+1	SIMPLE	t1	ref	a	a	5	test.t0.a	1	Using index condition(BKA); Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 select * from t0, t1 where t0.a<=>t1.a;
 a	a	b
 0	0	0
@ -504,7 +504,7 @@ table3.col_varchar_key = table2.col_varchar_nokey AND
 table3.pk<>0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	table2	ALL	col_varchar_key	NULL	NULL	NULL	20	Using where
-1	SIMPLE	table3	ref	PRIMARY,col_varchar_key	col_varchar_key	3	test.table2.col_varchar_key	3	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	table3	ref	PRIMARY,col_varchar_key	col_varchar_key	3	test.table2.col_varchar_key	3	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 set join_cache_level= @save_join_cache_level;
 set join_buffer_size= @save_join_buffer_size;
 drop table t1;
--- a/mysql-test/r/null.result
+++ b/mysql-test/r/null.result
@ -148,10 +148,10 @@ insert into t1 values
 (7,7), (8,8), (9,9), (10,10), (11,11), (12,12);
 explain select * from t1 where a between 2 and 3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	idx	idx	4	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	idx	idx	4	NULL	2	Using index condition; Rowid-ordered scan
 explain select * from t1 where a between 2 and 3 or b is null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	idx	idx	4	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	idx	idx	4	NULL	2	Using index condition; Rowid-ordered scan
 drop table t1;
 select cast(NULL as signed);
 cast(NULL as signed)
--- a/mysql-test/r/order_by.result
+++ b/mysql-test/r/order_by.result
@ -611,7 +611,7 @@ DS-MRR: use two IGNORE INDEX queries, otherwise we get cost races, because
 DS-MRR: records_in_range/read_time return the same numbers for all three indexes
 EXPLAIN SELECT * FROM t1 IGNORE INDEX (LongField, StringField) WHERE FieldKey > '2' ORDER BY LongVal;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	FieldKey	FieldKey	38	NULL	4	Using index condition; Using MRR; Using filesort
+1	SIMPLE	t1	range	FieldKey	FieldKey	38	NULL	4	Using index condition; Rowid-ordered scan; Using filesort
 EXPLAIN SELECT * FROM t1 IGNORE INDEX (FieldKey, LongField) WHERE FieldKey > '2' ORDER BY LongVal;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	range	StringField	StringField	38	NULL	4	Using where; Using filesort
@ -1112,7 +1112,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	index	k2	k3	5	NULL	73	Using where
 EXPLAIN SELECT id,c3 FROM t2 WHERE c2 BETWEEN 20 AND 30 ORDER BY c3 LIMIT 4000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t2	range	k2	k2	5	NULL	386	Using index condition; Using where; Using MRR; Using filesort
+1	SIMPLE	t2	range	k2	k2	5	NULL	386	Using index condition; Using where; Rowid-ordered scan; Using filesort
 SELECT id,c3 FROM t2 WHERE c2=11 ORDER BY c3 LIMIT 20;
 id	c3
 6	14
@ -1607,19 +1607,19 @@ INSERT INTO t2 SELECT a+4, b FROM t2;
 EXPLAIN 
 SELECT * FROM t1 FORCE INDEX FOR ORDER BY (a), t2 WHERE t1.a < 2 ORDER BY t1.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	a	a	5	NULL	2	Using index condition; Using MRR; Using temporary; Using filesort
+1	SIMPLE	t1	range	a	a	5	NULL	2	Using index condition; Rowid-ordered scan; Using temporary; Using filesort
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10	Using join buffer (flat, BNL join)
 # should have "using filesort"
 EXPLAIN 
 SELECT * FROM t1 USE INDEX FOR ORDER BY (a), t2 WHERE t1.a < 2 ORDER BY t1.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	a	a	5	NULL	2	Using index condition; Using MRR; Using temporary; Using filesort
+1	SIMPLE	t1	range	a	a	5	NULL	2	Using index condition; Rowid-ordered scan; Using temporary; Using filesort
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10	Using join buffer (flat, BNL join)
 # should have "using filesort"
 EXPLAIN 
 SELECT * FROM t1 FORCE INDEX FOR JOIN (a), t2 WHERE t1.a < 2 ORDER BY t1.a;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	a	a	5	NULL	2	Using index condition; Using MRR; Using temporary; Using filesort
+1	SIMPLE	t1	range	a	a	5	NULL	2	Using index condition; Rowid-ordered scan; Using temporary; Using filesort
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	10	Using join buffer (flat, BNL join)
 DROP TABLE t1, t2;
 #
--- a/mysql-test/r/ps_1general.result
+++ b/mysql-test/r/ps_1general.result
@ -465,9 +465,9 @@ def					key	253	64	7	Y	0	31	8
 def					key_len	253	4096	1	Y	0	31	8
 def					ref	253	2048	0	Y	0	31	8
 def					rows	8	10	1	Y	32928	0	63
-def					Extra	253	255	48	N	1	31	8
+def					Extra	253	255	57	N	1	31	8
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	Using index condition; Using MRR; Using filesort
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	Using index condition; Rowid-ordered scan; Using filesort
 drop table if exists t2;
 create table t2 (id smallint, name varchar(20)) ;
 prepare stmt1 from ' insert into t2 values(?, ?) ' ;
--- a/mysql-test/r/range.result
+++ b/mysql-test/r/range.result
@ -221,27 +221,27 @@ update t1 set y=x;
 explain select * from t1, t1 t2 where t1.y = 8 and t2.x between 7 and t1.y+0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Using MRR; Using join buffer (flat, BNL join)
+1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Rowid-ordered scan; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 8 and t2.x >= 7 and t2.x <= t1.y+0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Using MRR; Using join buffer (flat, BNL join)
+1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Rowid-ordered scan; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x between t1.y-1 and t1.y+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	3	Using index condition; Using MRR; Using join buffer (flat, BNL join)
+1	SIMPLE	t2	range	x	x	5	NULL	3	Using index condition; Rowid-ordered scan; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x >= t1.y-1 and t2.x <= t1.y+1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	3	Using index condition; Using MRR; Using join buffer (flat, BNL join)
+1	SIMPLE	t2	range	x	x	5	NULL	3	Using index condition; Rowid-ordered scan; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x between 0 and t1.y;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Using MRR; Using join buffer (flat, BNL join)
+1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Rowid-ordered scan; Using join buffer (flat, BNL join)
 explain select * from t1, t1 t2 where t1.y = 2 and t2.x >= 0 and t2.x <= t1.y;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	y	y	5	const	1	
-1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Using MRR; Using join buffer (flat, BNL join)
+1	SIMPLE	t2	range	x	x	5	NULL	2	Using index condition; Rowid-ordered scan; Using join buffer (flat, BNL join)
 explain select count(*) from t1 where x in (1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	x	x	5	const	1	Using index
@ -276,7 +276,7 @@ INSERT INTO t1 VALUES
 (33,5),(33,5),(33,5),(33,5),(34,5),(35,5);
 EXPLAIN SELECT * FROM t1 WHERE a IN(1,2) AND b=5;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	a,b	a	5	NULL	2	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	a,b	a	5	NULL	2	Using index condition; Using where; Rowid-ordered scan
 SELECT * FROM t1 WHERE a IN(1,2) AND b=5;
 a	b
 DROP TABLE t1;
@ -421,19 +421,19 @@ test.t1	analyze	status	OK
 test.t2	analyze	status	Table is already up to date
 explain select * from t1, t2  where t1.uid=t2.uid AND t1.uid > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	uid_index	uid_index	4	NULL	112	Using index condition; Using MRR
+1	SIMPLE	t1	range	uid_index	uid_index	4	NULL	112	Using index condition; Rowid-ordered scan
 1	SIMPLE	t2	ref	uid_index	uid_index	4	test.t1.uid	38	
 explain select * from t1, t2  where t1.uid=t2.uid AND t2.uid > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	uid_index	uid_index	4	NULL	112	Using index condition; Using MRR
+1	SIMPLE	t1	range	uid_index	uid_index	4	NULL	112	Using index condition; Rowid-ordered scan
 1	SIMPLE	t2	ref	uid_index	uid_index	4	test.t1.uid	38	
 explain select * from t1, t2  where t1.uid=t2.uid AND t1.uid != 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	uid_index	uid_index	4	NULL	113	Using index condition; Using MRR
+1	SIMPLE	t1	range	uid_index	uid_index	4	NULL	113	Using index condition; Rowid-ordered scan
 1	SIMPLE	t2	ref	uid_index	uid_index	4	test.t1.uid	38	
 explain select * from t1, t2  where t1.uid=t2.uid AND t2.uid != 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	uid_index	uid_index	4	NULL	113	Using index condition; Using MRR
+1	SIMPLE	t1	range	uid_index	uid_index	4	NULL	113	Using index condition; Rowid-ordered scan
 1	SIMPLE	t2	ref	uid_index	uid_index	4	test.t1.uid	38	
 select * from t1, t2  where t1.uid=t2.uid AND t1.uid > 0;
 id	name	uid	id	name	uid
@ -618,10 +618,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	a	a	11	const	2	Using index condition
 explain select * from t1 where a=binary 'aaa';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	a	a	11	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	a	a	11	NULL	2	Using index condition; Rowid-ordered scan
 explain select * from t1 where a='aaa' collate latin1_bin;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	a	a	11	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	a	a	11	NULL	2	Using index condition; Rowid-ordered scan
 explain select * from t1 where a='aaa' collate latin1_german1_ci;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	a	NULL	NULL	NULL	9	Using where
@ -878,10 +878,10 @@ INSERT INTO t1 VALUES
 (55,'C'), (56,'C'), (57,'C'), (58,'C'), (59,'C'), (60,'C');
 EXPLAIN SELECT * FROM t1 WHERE status <> 'A' AND status <> 'B';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	status	status	23	NULL	11	Using index condition; Using MRR
+1	SIMPLE	t1	range	status	status	23	NULL	11	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE status NOT IN ('A','B');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	status	status	23	NULL	11	Using index condition; Using MRR
+1	SIMPLE	t1	range	status	status	23	NULL	11	Using index condition; Rowid-ordered scan
 SELECT * FROM t1 WHERE status <> 'A' AND status <> 'B';
 id	status
 53	C
@ -910,10 +910,10 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	range	status	status	23	NULL	11	Using where; Using index
 EXPLAIN SELECT * FROM t1 WHERE status NOT BETWEEN 'A' AND 'B';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	status	status	23	NULL	10	Using index condition; Using MRR
+1	SIMPLE	t1	range	status	status	23	NULL	10	Using index condition; Rowid-ordered scan
 EXPLAIN SELECT * FROM t1 WHERE status < 'A' OR status > 'B';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	status	status	23	NULL	10	Using index condition; Using MRR
+1	SIMPLE	t1	range	status	status	23	NULL	10	Using index condition; Rowid-ordered scan
 SELECT * FROM t1 WHERE status NOT BETWEEN 'A' AND 'B';
 id	status
 53	C
@ -1014,10 +1014,10 @@ create table t2 (a varchar(10), filler char(200), key(a));
 insert into t2 select * from t1;
 explain select * from t1 where a between 'a' and 'a ';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	a	a	13	NULL	#	Using index condition; Using MRR
+1	SIMPLE	t1	range	a	a	13	NULL	#	Using index condition; Rowid-ordered scan
 explain select * from t1 where a = 'a' or a='a ';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	a	a	13	NULL	#	Using index condition; Using MRR
+1	SIMPLE	t1	range	a	a	13	NULL	#	Using index condition; Rowid-ordered scan
 explain select * from t2 where a between 'a' and 'a ';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ref	a	a	13	const	#	Using index condition
@ -1027,7 +1027,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 update t1 set a='b' where a<>'a';
 explain select * from t1 where a not between 'b' and 'b';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	a	a	13	NULL	#	Using index condition; Using MRR
+1	SIMPLE	t1	range	a	a	13	NULL	#	Using index condition; Rowid-ordered scan
 select a, hex(filler) from t1 where a not between 'b' and 'b';
 a	hex(filler)
 a	0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
@ -1071,10 +1071,10 @@ id	b	c
 0	3	4
 EXPLAIN  SELECT * FROM t1 WHERE b<=3 AND 3<=c;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	idx1,idx2	idx2	4	NULL	3	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	idx1,idx2	idx2	4	NULL	3	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN  SELECT * FROM t1 WHERE 3 BETWEEN b AND c;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	idx1,idx2	idx2	4	NULL	3	Using where; Using MRR
+1	SIMPLE	t1	range	idx1,idx2	idx2	4	NULL	3	Using where; Rowid-ordered scan
 SELECT * FROM t1 WHERE 0 < b OR 0 > c;
 id	b	c
 0	3	4
@ -1151,7 +1151,7 @@ INSERT INTO t1 VALUES
 This must use range access:
 explain select * from t1 where dateval >= '2007-01-01 00:00:00' and dateval <= '2007-01-02 23:59:59';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	dateval	dateval	4	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	dateval	dateval	4	NULL	2	Using index condition; Rowid-ordered scan
 drop table t1;
 CREATE TABLE t1 (
 a varchar(32), index (a)
--- a/mysql-test/r/range_vs_index_merge.result
+++ b/mysql-test/r/range_vs_index_merge.result
@ -49,14 +49,14 @@ SELECT * FROM City
 WHERE (Population >= 100000 OR Name LIKE 'P%') AND Country='CAN' OR
 (Population < 100000 OR Name Like 'T%') AND Country='ARG';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population,Country,Name	Country	3	NULL	104	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	Population,Country,Name	Country	3	NULL	104	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE Population < 200000 AND Name LIKE 'P%' AND
 (Population > 300000 OR Name LIKE 'T%') AND
 (Population < 100000 OR Name LIKE 'Pa%');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population,Name	Name	35	NULL	135	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	Population,Name	Name	35	NULL	135	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE Population > 100000 AND Name LIKE 'Aba%' OR
@ -69,12 +69,12 @@ EXPLAIN
 SELECT * FROM City
 WHERE (Population > 101000 AND Population < 115000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	459	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	459	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City
 WHERE (Population > 101000 AND Population < 102000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	39	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	39	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City
 WHERE ((Name > 'Ca' AND Name < 'Cf') OR (Country > 'E' AND Country < 'F'));
@ -91,7 +91,7 @@ SELECT * FROM City
 WHERE ((Name > 'Ca' AND Name < 'Cf') OR (Country > 'E' AND Country < 'F'))
 AND (Population > 101000 AND Population < 102000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population,Country,Name	Population	4	NULL	39	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	Population,Country,Name	Population	4	NULL	39	Using index condition; Using where; Rowid-ordered scan
 SELECT * FROM City USE INDEX ()
 WHERE ((Name > 'Ca' AND Name < 'Cf') OR (Country > 'E' AND Country < 'F'))
 AND (Population > 101000 AND Population < 115000);
@ -171,37 +171,37 @@ ID	Name	Country	Population
 EXPLAIN
 SELECT  * FROM City WHERE (Name < 'Ac');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	13	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	13	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City WHERE (Name < 'Bb');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	208	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	208	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City WHERE (Country > 'A' AND Country < 'B');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Country	Country	3	NULL	104	Using index condition; Using MRR
+1	SIMPLE	City	range	Country	Country	3	NULL	104	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City WHERE (Name BETWEEN 'P' AND 'Pb');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	39	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	39	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City WHERE (Name BETWEEN 'P' AND 'S');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	221	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	221	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City WHERE (Population > 101000 AND Population < 110000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	328	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	328	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City WHERE (Population > 103000 AND Population < 104000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	37	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	37	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City 
 WHERE (Name < 'Ac' AND (Country > 'A' AND Country < 'B')) OR
 (Name BETWEEN 'P' AND 'Pb' AND (Population > 101000 AND Population < 110000));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population,Country,Name	Name	35	NULL	52	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	Population,Country,Name	Name	35	NULL	52	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City
 WHERE (Name < 'Ac' AND (Country > 'A' AND Country < 'B')) OR
@ -327,11 +327,11 @@ ID	Name	Country	Population
 EXPLAIN
 SELECT * FROM City WHERE (ID < 10) OR (ID BETWEEN 100 AND 110);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	21	Using index condition; Using MRR
+1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	21	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE (ID < 200) OR (ID BETWEEN 100 AND 200);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	201	Using index condition; Using MRR
+1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	201	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE (ID < 600) OR (ID BETWEEN 900 AND 1500);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@ -339,22 +339,22 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN
 SELECT * FROM City WHERE Country > 'A' AND Country < 'ARG';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Country	Country	3	NULL	19	Using index condition; Using MRR
+1	SIMPLE	City	range	Country	Country	3	NULL	19	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE Name LIKE 'H%' OR Name LIKE 'P%' ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	222	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	222	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE Name LIKE 'Ha%' OR Name LIKE 'Pa%' ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	72	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	72	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE ((ID < 10) AND (Name LIKE 'H%' OR (Country > 'A' AND Country < 'ARG')))
 OR ((ID BETWEEN 100 AND 110) AND 
 (Name LIKE 'P%' OR (Population > 103000 AND Population < 104000)));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY,Population,Country,Name	PRIMARY	4	NULL	21	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	PRIMARY,Population,Country,Name	PRIMARY	4	NULL	21	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE ((ID < 800) AND (Name LIKE 'Ha%' OR (Country > 'A' AND Country < 'ARG')))
@ -576,39 +576,39 @@ ID	Name	Country	Population
 EXPLAIN 
 SELECT * FROM City WHERE Population > 101000 AND Population < 102000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	39	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	39	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE Population > 101000 AND Population < 110000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	328	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	328	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE Country < 'C';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Country	Country	3	NULL	436	Using index condition; Using MRR
+1	SIMPLE	City	range	Country	Country	3	NULL	436	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE Country < 'AGO';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Country	Country	3	NULL	6	Using index condition; Using MRR
+1	SIMPLE	City	range	Country	Country	3	NULL	6	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE Name BETWEEN 'P' AND 'S';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	221	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	221	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE Name BETWEEN 'P' AND 'Pb';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	39	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	39	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE ID BETWEEN 3400 AND 3800;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	401	Using index condition; Using MRR
+1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	401	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE ID BETWEEN 3790 AND 3800;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	11	Using index condition; Using MRR
+1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	11	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE Name LIKE 'P%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	135	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	135	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE ((Population > 101000 AND Population < 102000) AND
@ -679,15 +679,15 @@ CREATE INDEX CountryPopulation ON City(Country,Population);
 EXPLAIN
 SELECT * FROM City WHERE Name LIKE 'Pas%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	5	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	5	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE Name LIKE 'P%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	135	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	135	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE (Population > 101000 AND Population < 103000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	81	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	81	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE Country='USA';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@ -764,39 +764,39 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN
 SELECT * FROM City WHERE ID BETWEEN 3790 AND 3800;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	11	Using index condition; Using MRR
+1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	11	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE ID BETWEEN 4025 AND 4035;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	11	Using index condition; Using MRR
+1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	11	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE ID BETWEEN 4028 AND 4032;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	5	Using index condition; Using MRR
+1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	5	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE ID BETWEEN 3500 AND 3800;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	301	Using index condition; Using MRR
+1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	301	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE ID BETWEEN 4000 AND 4300;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	80	Using index condition; Using MRR
+1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	80	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE ID BETWEEN 250 and 260 ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	11	Using index condition; Using MRR
+1	SIMPLE	City	range	PRIMARY	PRIMARY	4	NULL	11	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE (Population > 101000 AND Population < 102000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	39	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	39	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE (Population > 101000 AND Population < 103000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	81	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	81	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE Name LIKE 'Pa%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	41	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	41	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE ((Population > 101000 AND Population < 102000) OR
@ -949,14 +949,14 @@ WHERE ((Population > 101000 AND Population < 11000) OR
 ID BETWEEN 3500 AND 3800) AND Country='USA'
        AND (Name LIKE 'P%' OR ID BETWEEN 4000 AND 4300);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY,Population,Country,Name,CountryPopulation,CountryName	CountryName	38	NULL	23	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	PRIMARY,Population,Country,Name,CountryPopulation,CountryName	CountryName	38	NULL	23	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE ((Population > 101000 AND Population < 11000) OR
 ID BETWEEN 3500 AND 3800) AND Country='USA'
        AND (Name LIKE 'Pho%' OR ID BETWEEN 4000 AND 4300);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY,Population,Country,Name,CountryPopulation,CountryName	Name	35	NULL	1	Using where; Using MRR
+1	SIMPLE	City	range	PRIMARY,Population,Country,Name,CountryPopulation,CountryName	Name	35	NULL	1	Using where; Rowid-ordered scan
 SELECT * FROM City USE INDEX ()
 WHERE ((Population > 101000 AND Population < 11000) OR
 ID BETWEEN 3500 AND 3800) AND Country='USA'
--- a/mysql-test/r/range_vs_index_merge_innodb.result
+++ b/mysql-test/r/range_vs_index_merge_innodb.result
@ -50,14 +50,14 @@ SELECT * FROM City
 WHERE (Population >= 100000 OR Name LIKE 'P%') AND Country='CAN' OR
 (Population < 100000 OR Name Like 'T%') AND Country='ARG';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population,Country,Name	Country	3	NULL	106	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	Population,Country,Name	Country	3	NULL	106	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE Population < 200000 AND Name LIKE 'P%' AND
 (Population > 300000 OR Name LIKE 'T%') AND
 (Population < 100000 OR Name LIKE 'Pa%');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population,Name	Name	35	NULL	235	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	Population,Name	Name	35	NULL	235	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE Population > 100000 AND Name LIKE 'Aba%' OR
@ -70,12 +70,12 @@ EXPLAIN
 SELECT * FROM City
 WHERE (Population > 101000 AND Population < 115000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	458	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	458	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City
 WHERE (Population > 101000 AND Population < 102000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	38	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	38	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City
 WHERE ((Name > 'Ca' AND Name < 'Cf') OR (Country > 'E' AND Country < 'F'));
@ -92,7 +92,7 @@ SELECT * FROM City
 WHERE ((Name > 'Ca' AND Name < 'Cf') OR (Country > 'E' AND Country < 'F'))
 AND (Population > 101000 AND Population < 102000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population,Country,Name	Population	4	NULL	38	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	Population,Country,Name	Population	4	NULL	38	Using index condition; Using where; Rowid-ordered scan
 SELECT * FROM City USE INDEX ()
 WHERE ((Name > 'Ca' AND Name < 'Cf') OR (Country > 'E' AND Country < 'F'))
 AND (Population > 101000 AND Population < 115000);
@ -172,37 +172,37 @@ ID	Name	Country	Population
 EXPLAIN
 SELECT  * FROM City WHERE (Name < 'Ac');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	23	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	23	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City WHERE (Name < 'Bb');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	373	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	373	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City WHERE (Country > 'A' AND Country < 'B');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Country	Country	3	NULL	106	Using index condition; Using MRR
+1	SIMPLE	City	range	Country	Country	3	NULL	106	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City WHERE (Name BETWEEN 'P' AND 'Pb');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	71	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	71	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City WHERE (Name BETWEEN 'P' AND 'S');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	384	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	384	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City WHERE (Population > 101000 AND Population < 110000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	327	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	327	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City WHERE (Population > 103000 AND Population < 104000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	36	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	36	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City 
 WHERE (Name < 'Ac' AND (Country > 'A' AND Country < 'B')) OR
 (Name BETWEEN 'P' AND 'Pb' AND (Population > 101000 AND Population < 110000));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population,Country,Name	Name	35	NULL	94	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	Population,Country,Name	Name	35	NULL	94	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN
 SELECT  * FROM City
 WHERE (Name < 'Ac' AND (Country > 'A' AND Country < 'B')) OR
@ -340,15 +340,15 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN
 SELECT * FROM City WHERE Country > 'A' AND Country < 'ARG';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Country	Country	3	NULL	19	Using index condition; Using MRR
+1	SIMPLE	City	range	Country	Country	3	NULL	19	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE Name LIKE 'H%' OR Name LIKE 'P%' ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	394	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	394	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE Name LIKE 'Ha%' OR Name LIKE 'Pa%' ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	133	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	133	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE ((ID < 10) AND (Name LIKE 'H%' OR (Country > 'A' AND Country < 'ARG')))
@ -577,27 +577,27 @@ ID	Name	Country	Population
 EXPLAIN 
 SELECT * FROM City WHERE Population > 101000 AND Population < 102000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	38	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	38	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE Population > 101000 AND Population < 110000;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	327	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	327	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE Country < 'C';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Country	Country	3	NULL	446	Using index condition; Using MRR
+1	SIMPLE	City	range	Country	Country	3	NULL	446	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE Country < 'AGO';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Country	Country	3	NULL	5	Using index condition; Using MRR
+1	SIMPLE	City	range	Country	Country	3	NULL	5	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE Name BETWEEN 'P' AND 'S';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	384	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	384	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE Name BETWEEN 'P' AND 'Pb';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	71	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	71	Using index condition; Rowid-ordered scan
 EXPLAIN 
 SELECT * FROM City WHERE ID BETWEEN 3400 AND 3800;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@ -609,7 +609,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN 
 SELECT * FROM City WHERE Name LIKE 'P%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	235	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	235	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE ((Population > 101000 AND Population < 102000) AND
@ -680,15 +680,15 @@ CREATE INDEX CountryPopulation ON City(Country,Population);
 EXPLAIN
 SELECT * FROM City WHERE Name LIKE 'Pas%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	8	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	8	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE Name LIKE 'P%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	235	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	235	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE (Population > 101000 AND Population < 103000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	80	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	80	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE Country='USA';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@ -789,15 +789,15 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 EXPLAIN
 SELECT * FROM City WHERE (Population > 101000 AND Population < 102000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	38	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	38	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE (Population > 101000 AND Population < 103000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Population	Population	4	NULL	80	Using index condition; Using MRR
+1	SIMPLE	City	range	Population	Population	4	NULL	80	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City WHERE Name LIKE 'Pa%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	Name	Name	35	NULL	71	Using index condition; Using MRR
+1	SIMPLE	City	range	Name	Name	35	NULL	71	Using index condition; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE ((Population > 101000 AND Population < 102000) OR
@ -950,14 +950,14 @@ WHERE ((Population > 101000 AND Population < 11000) OR
 ID BETWEEN 3500 AND 3800) AND Country='USA'
        AND (Name LIKE 'P%' OR ID BETWEEN 4000 AND 4300);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY,Population,Country,Name,CountryPopulation,CountryName	CountryName	38	NULL	18	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	PRIMARY,Population,Country,Name,CountryPopulation,CountryName	CountryName	38	NULL	18	Using index condition; Using where; Rowid-ordered scan
 EXPLAIN
 SELECT * FROM City
 WHERE ((Population > 101000 AND Population < 11000) OR
 ID BETWEEN 3500 AND 3800) AND Country='USA'
        AND (Name LIKE 'Pho%' OR ID BETWEEN 4000 AND 4300);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	City	range	PRIMARY,Population,Country,Name,CountryPopulation,CountryName	Name	35	NULL	1	Using index condition; Using where; Using MRR
+1	SIMPLE	City	range	PRIMARY,Population,Country,Name,CountryPopulation,CountryName	Name	35	NULL	1	Using index condition; Using where; Rowid-ordered scan
 SELECT * FROM City USE INDEX ()
 WHERE ((Population > 101000 AND Population < 11000) OR
 ID BETWEEN 3500 AND 3800) AND Country='USA'
--- a/mysql-test/r/select.result
+++ b/mysql-test/r/select.result
@ -3417,7 +3417,7 @@ SELECT t2.sku, t2.sppr, t2.name, t1.sku, t1.pr
 FROM t2, t1 WHERE t2.sku=20 AND (t2.sku=t1.sku OR t2.sppr=t1.sku);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Rowid-ordered scan
 DROP TABLE t1,t2;
 CREATE TABLE t1 (i TINYINT UNSIGNED NOT NULL);
 INSERT t1 SET i = 0;
@ -3453,7 +3453,7 @@ In next EXPLAIN, B.rows must be exactly 10:
 explain select * from t2 A, t2 B where A.a=5 and A.b=5 and A.C<5
 and B.a=5 and B.b=A.e and (B.b =1 or B.b = 3 or B.b=5);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	A	range	PRIMARY	PRIMARY	12	NULL	4	Using index condition; Using where; Using MRR
+1	SIMPLE	A	range	PRIMARY	PRIMARY	12	NULL	4	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	B	ref	PRIMARY	PRIMARY	8	const,test.A.e	10	
 drop table t1, t2;
 CREATE TABLE t1 (a int PRIMARY KEY, b int, INDEX(b));
@ -3467,12 +3467,12 @@ INSERT INTO t2 VALUES
 EXPLAIN
 SELECT a, c, d, f FROM t1,t2 WHERE a=c AND b BETWEEN 4 AND 6;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Rowid-ordered scan
 1	SIMPLE	t2	ref	c	c	5	test.t1.a	2	
 EXPLAIN
 SELECT a, c, d, f FROM t1,t2 WHERE a=c AND b BETWEEN 4 AND 6 AND a > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t2	ref	c	c	5	test.t1.a	2	
 DROP TABLE t1, t2;
 create table t1 (
@ -3562,19 +3562,19 @@ EXPLAIN SELECT t2.*
 FROM t1 JOIN t2 ON t2.fk=t1.pk
 WHERE t2.fk < 'c' AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	3	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	3	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where
 EXPLAIN SELECT t2.* 
 FROM t1 JOIN t2 ON t2.fk=t1.pk 
 WHERE t2.fk BETWEEN 'a' AND 'b' AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where
 EXPLAIN SELECT t2.* 
 FROM t1 JOIN t2 ON t2.fk=t1.pk 
 WHERE t2.fk IN ('a','b') AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where
 DROP TABLE t1,t2;
 CREATE TABLE t1 (a int, b varchar(20) NOT NULL, PRIMARY KEY(a));
@ -3608,7 +3608,7 @@ WHERE t1.id = 8 AND t2.i BETWEEN t1.b AND t1.e AND
 t3.a=t2.a AND t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si	si	5	NULL	4	Using index condition; Using where; Using MRR
+1	SIMPLE	t2	range	si	si	5	NULL	4	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 EXPLAIN
 SELECT t3.a FROM t1,t2,t3
@ -3616,7 +3616,7 @@ WHERE t1.id = 8 AND t2.i BETWEEN t1.b AND t1.e AND
 t3.a=t2.a AND t3.c IN ('bb','ee') ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si,ai	si	5	NULL	4	Using index condition; Using where; Using MRR
+1	SIMPLE	t2	range	si,ai	si	5	NULL	4	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 EXPLAIN 
 SELECT t3.a FROM t1,t2 FORCE INDEX (si),t3
@ -3624,7 +3624,7 @@ WHERE t1.id = 8 AND (t2.i=t1.b OR t2.i=t1.e) AND t3.a=t2.a AND
 t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si	si	5	NULL	2	Using index condition; Using where; Using MRR
+1	SIMPLE	t2	range	si	si	5	NULL	2	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 EXPLAIN 
 SELECT t3.a FROM t1,t2,t3
@ -3632,7 +3632,7 @@ WHERE t1.id = 8 AND (t2.i=t1.b OR t2.i=t1.e) AND t3.a=t2.a AND
 t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si,ai	si	5	NULL	2	Using index condition; Using where; Using MRR
+1	SIMPLE	t2	range	si,ai	si	5	NULL	2	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 DROP TABLE t1,t2,t3;
 CREATE TABLE t1 ( f1 int primary key, f2 int, f3 int, f4 int, f5 int, f6 int, checked_out int);
@ -3752,7 +3752,7 @@ AND t1.ts BETWEEN t2.dt1 AND t2.dt2
 AND t1.ts BETWEEN "2006-01-01" AND "2006-12-31";
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t1	range	ts	ts	4	NULL	1	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	ts	ts	4	NULL	1	Using index condition; Using where; Rowid-ordered scan
 Warnings:
 Warning	1292	Incorrect datetime value: '2999-12-31 00:00:00' for column 'ts' at row 1
 SELECT * FROM t1 LEFT JOIN t2 ON (t1.a=t2.a) WHERE t1.a=30
@ -4376,12 +4376,12 @@ CREATE TABLE t1 (a INT KEY, b INT);
 INSERT INTO t1 VALUES (1,1), (2,2), (3,3), (4,4);
 EXPLAIN EXTENDED SELECT a, b FROM t1 WHERE a > 1 AND a = b LIMIT 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Rowid-ordered scan
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`b` = `test`.`t1`.`a`) and (`test`.`t1`.`a` > 1)) limit 2
 EXPLAIN EXTENDED SELECT a, b FROM t1 WHERE a > 1 AND b = a LIMIT 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Rowid-ordered scan
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`b` = `test`.`t1`.`a`) and (`test`.`t1`.`a` > 1)) limit 2
 DROP TABLE t1;
--- a/mysql-test/r/select_jcl6.result
+++ b/mysql-test/r/select_jcl6.result
@ -611,15 +611,15 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 explain select * from t3 as t1,t3 where t1.period=t3.period order by t3.period;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	period	NULL	NULL	NULL	41810	Using temporary; Using filesort
-1	SIMPLE	t3	ref	period	period	4	test.t1.period	4181	Using join buffer (flat, BKA join)
+1	SIMPLE	t3	ref	period	period	4	test.t1.period	4181	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 explain select * from t3 as t1,t3 where t1.period=t3.period order by t3.period limit 10;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t3	ALL	period	NULL	NULL	NULL	41810	Using temporary; Using filesort
-1	SIMPLE	t1	ref	period	period	4	test.t3.period	4181	Using join buffer (flat, BKA join)
+1	SIMPLE	t1	ref	period	period	4	test.t3.period	4181	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 explain select * from t3 as t1,t3 where t1.period=t3.period order by t1.period limit 10;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	period	NULL	NULL	NULL	41810	Using temporary; Using filesort
-1	SIMPLE	t3	ref	period	period	4	test.t1.period	4181	Using join buffer (flat, BKA join)
+1	SIMPLE	t3	ref	period	period	4	test.t1.period	4181	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 select period from t1;
 period
 9410
@ -1366,7 +1366,7 @@ count(*)
 explain select t2.companynr,companyname from t2 left join t4 using (companynr) where t4.companynr is null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1200	
-1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	Using where; Not exists; Using join buffer (flat, BKA join)
+1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	Using where; Not exists; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr is null;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t4	ALL	NULL	NULL	NULL	NULL	12	
@ -1386,15 +1386,15 @@ delete from t2 where fld1=999999;
 explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
-1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	Using join buffer (flat, BKA join)
+1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr > 0 or t2.companynr < 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
-1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	Using join buffer (flat, BKA join)
+1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 explain select t2.companynr,companyname from t4 left join t2 using (companynr) where t2.companynr > 0 and t4.companynr > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	1199	Using where
-1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	Using join buffer (flat, BKA join)
+1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	1	test.t2.companynr	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 explain select companynr,companyname from t4 left join t2 using (companynr) where companynr > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t4	ALL	PRIMARY	NULL	NULL	NULL	12	Using where
@ -3424,7 +3424,7 @@ SELECT t2.sku, t2.sppr, t2.name, t1.sku, t1.pr
 FROM t2, t1 WHERE t2.sku=20 AND (t2.sku=t1.sku OR t2.sppr=t1.sku);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Rowid-ordered scan
 DROP TABLE t1,t2;
 CREATE TABLE t1 (i TINYINT UNSIGNED NOT NULL);
 INSERT t1 SET i = 0;
@ -3460,8 +3460,8 @@ In next EXPLAIN, B.rows must be exactly 10:
 explain select * from t2 A, t2 B where A.a=5 and A.b=5 and A.C<5
 and B.a=5 and B.b=A.e and (B.b =1 or B.b = 3 or B.b=5);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	A	range	PRIMARY	PRIMARY	12	NULL	4	Using index condition; Using where; Using MRR
+1	SIMPLE	A	range	PRIMARY	PRIMARY	12	NULL	4	Using index condition; Using where; Rowid-ordered scan
-1	SIMPLE	B	ref	PRIMARY	PRIMARY	8	const,test.A.e	10	Using join buffer (flat, BKA join)
+1	SIMPLE	B	ref	PRIMARY	PRIMARY	8	const,test.A.e	10	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 drop table t1, t2;
 CREATE TABLE t1 (a int PRIMARY KEY, b int, INDEX(b));
 INSERT INTO t1 VALUES (1, 3), (9,4), (7,5), (4,5), (6,2),
@ -3474,13 +3474,13 @@ INSERT INTO t2 VALUES
 EXPLAIN
 SELECT a, c, d, f FROM t1,t2 WHERE a=c AND b BETWEEN 4 AND 6;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Rowid-ordered scan
-1	SIMPLE	t2	ref	c	c	5	test.t1.a	2	Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	c	c	5	test.t1.a	2	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 EXPLAIN
 SELECT a, c, d, f FROM t1,t2 WHERE a=c AND b BETWEEN 4 AND 6 AND a > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using where; Rowid-ordered scan
-1	SIMPLE	t2	ref	c	c	5	test.t1.a	2	Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	c	c	5	test.t1.a	2	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 DROP TABLE t1, t2;
 create table t1 (
 a int unsigned    not null auto_increment primary key,
@ -3569,20 +3569,20 @@ EXPLAIN SELECT t2.*
 FROM t1 JOIN t2 ON t2.fk=t1.pk
 WHERE t2.fk < 'c' AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	3	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	3	Using index condition; Using where; Rowid-ordered scan
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 EXPLAIN SELECT t2.* 
 FROM t1 JOIN t2 ON t2.fk=t1.pk 
 WHERE t2.fk BETWEEN 'a' AND 'b' AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Rowid-ordered scan
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 EXPLAIN SELECT t2.* 
 FROM t1 JOIN t2 ON t2.fk=t1.pk 
 WHERE t2.fk IN ('a','b') AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Rowid-ordered scan
-1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 DROP TABLE t1,t2;
 CREATE TABLE t1 (a int, b varchar(20) NOT NULL, PRIMARY KEY(a));
 CREATE TABLE t2 (a int, b varchar(20) NOT NULL,
@ -3615,32 +3615,32 @@ WHERE t1.id = 8 AND t2.i BETWEEN t1.b AND t1.e AND
 t3.a=t2.a AND t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si	si	5	NULL	4	Using index condition; Using where; Using MRR
+1	SIMPLE	t2	range	si	si	5	NULL	4	Using index condition; Using where; Rowid-ordered scan
-1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 EXPLAIN
 SELECT t3.a FROM t1,t2,t3
 WHERE t1.id = 8 AND t2.i BETWEEN t1.b AND t1.e AND
 t3.a=t2.a AND t3.c IN ('bb','ee') ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si,ai	si	5	NULL	4	Using index condition; Using where; Using MRR
+1	SIMPLE	t2	range	si,ai	si	5	NULL	4	Using index condition; Using where; Rowid-ordered scan
-1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 EXPLAIN 
 SELECT t3.a FROM t1,t2 FORCE INDEX (si),t3
 WHERE t1.id = 8 AND (t2.i=t1.b OR t2.i=t1.e) AND t3.a=t2.a AND
 t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si	si	5	NULL	2	Using index condition; Using where; Using MRR
+1	SIMPLE	t2	range	si	si	5	NULL	2	Using index condition; Using where; Rowid-ordered scan
-1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 EXPLAIN 
 SELECT t3.a FROM t1,t2,t3
 WHERE t1.id = 8 AND (t2.i=t1.b OR t2.i=t1.e) AND t3.a=t2.a AND
 t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si,ai	si	5	NULL	2	Using index condition; Using where; Using MRR
+1	SIMPLE	t2	range	si,ai	si	5	NULL	2	Using index condition; Using where; Rowid-ordered scan
-1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 DROP TABLE t1,t2,t3;
 CREATE TABLE t1 ( f1 int primary key, f2 int, f3 int, f4 int, f5 int, f6 int, checked_out int);
 CREATE TABLE t2 ( f11 int PRIMARY KEY );
@ -3759,7 +3759,7 @@ AND t1.ts BETWEEN t2.dt1 AND t2.dt2
 AND t1.ts BETWEEN "2006-01-01" AND "2006-12-31";
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t1	range	ts	ts	4	NULL	1	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	ts	ts	4	NULL	1	Using index condition; Using where; Rowid-ordered scan
 Warnings:
 Warning	1292	Incorrect datetime value: '2999-12-31 00:00:00' for column 'ts' at row 1
 SELECT * FROM t1 LEFT JOIN t2 ON (t1.a=t2.a) WHERE t1.a=30
@ -4383,12 +4383,12 @@ CREATE TABLE t1 (a INT KEY, b INT);
 INSERT INTO t1 VALUES (1,1), (2,2), (3,3), (4,4);
 EXPLAIN EXTENDED SELECT a, b FROM t1 WHERE a > 1 AND a = b LIMIT 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Rowid-ordered scan
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`b` = `test`.`t1`.`a`) and (`test`.`t1`.`a` > 1)) limit 2
 EXPLAIN EXTENDED SELECT a, b FROM t1 WHERE a > 1 AND b = a LIMIT 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Rowid-ordered scan
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`b` = `test`.`t1`.`a`) and (`test`.`t1`.`a` > 1)) limit 2
 DROP TABLE t1;
@ -4827,7 +4827,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	system	NULL	NULL	NULL	NULL	1	
 1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	12	
 1	SIMPLE	t3	ALL	NULL	NULL	NULL	NULL	1	Using where; Using join buffer (flat, BNL join)
-1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	4	const	1	Using join buffer (incremental, BKA join)
+1	SIMPLE	t4	eq_ref	PRIMARY	PRIMARY	4	const	1	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t5	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (incremental, BNL join)
 1	SIMPLE	t6	ALL	NULL	NULL	NULL	NULL	2	Using join buffer (incremental, BNL join)
 SELECT STRAIGHT_JOIN * FROM t2, (t1 LEFT JOIN (t3,t4) ON t1.f1 = t4.f1), t5, t6;
@ -4907,18 +4907,18 @@ SET SESSION optimizer_switch='index_condition_pushdown=off';
 EXPLAIN SELECT * from t1,t2,t3 WHERE t3.a3=t1.a1 AND t2.a2=t1.a1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	idx	NULL	NULL	NULL	3	
-1	SIMPLE	t2	ref	idx	idx	4	test.t1.a1	2	Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	idx	idx	4	test.t1.a1	2	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t3	ref	idx	idx	4	test.t1.a1	5	Using join buffer (incremental, BKA join)
+1	SIMPLE	t3	ref	idx	idx	4	test.t1.a1	5	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 EXPLAIN SELECT * FROM t1,t2,t3 WHERE t2.a2=t1.a1 AND t3.a3=t1.a1;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	idx	NULL	NULL	NULL	3	
-1	SIMPLE	t2	ref	idx	idx	4	test.t1.a1	2	Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	idx	idx	4	test.t1.a1	2	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t3	ref	idx	idx	4	test.t1.a1	5	Using join buffer (incremental, BKA join)
+1	SIMPLE	t3	ref	idx	idx	4	test.t1.a1	5	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 EXPLAIN SELECT * FROM t1,t2,t3 WHERE t2.a2=t1.a1 AND t3.a3=t2.a2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	idx	NULL	NULL	NULL	3	
-1	SIMPLE	t2	ref	idx	idx	4	test.t1.a1	2	Using join buffer (flat, BKA join)
+1	SIMPLE	t2	ref	idx	idx	4	test.t1.a1	2	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	SIMPLE	t3	ref	idx	idx	4	test.t1.a1	5	Using join buffer (incremental, BKA join)
+1	SIMPLE	t3	ref	idx	idx	4	test.t1.a1	5	Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 SELECT * from t1,t2,t3
 WHERE t3.a3=t1.a1 AND t2.a2=t1.a1 AND
 LENGTH(CONCAT(CONCAT(t1.b1,t2.b2),t3.b3)) <= 7;
@ -5013,7 +5013,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t5	system	PRIMARY	NULL	NULL	NULL	1	
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	Using index
 1	SIMPLE	t2	ref	f22	f22	5	const	1	
-1	SIMPLE	t6	ref	f61	f61	5	const	1	Using where; Using join buffer (flat, BKA join)
+1	SIMPLE	t6	ref	f61	f61	5	const	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 1	SIMPLE	t4	ref	f42	f42	5	const	1	Using index
 1	SIMPLE	t7	ALL	NULL	NULL	NULL	NULL	2	Using where; Using join buffer (flat, BNL join)
 SELECT t2.f23 FROM
--- a/mysql-test/r/select_pkeycache.result
+++ b/mysql-test/r/select_pkeycache.result
@ -3417,7 +3417,7 @@ SELECT t2.sku, t2.sppr, t2.name, t1.sku, t1.pr
 FROM t2, t1 WHERE t2.sku=20 AND (t2.sku=t1.sku OR t2.sppr=t1.sku);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Rowid-ordered scan
 DROP TABLE t1,t2;
 CREATE TABLE t1 (i TINYINT UNSIGNED NOT NULL);
 INSERT t1 SET i = 0;
@ -3453,7 +3453,7 @@ In next EXPLAIN, B.rows must be exactly 10:
 explain select * from t2 A, t2 B where A.a=5 and A.b=5 and A.C<5
 and B.a=5 and B.b=A.e and (B.b =1 or B.b = 3 or B.b=5);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	A	range	PRIMARY	PRIMARY	12	NULL	4	Using index condition; Using where; Using MRR
+1	SIMPLE	A	range	PRIMARY	PRIMARY	12	NULL	4	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	B	ref	PRIMARY	PRIMARY	8	const,test.A.e	10	
 drop table t1, t2;
 CREATE TABLE t1 (a int PRIMARY KEY, b int, INDEX(b));
@ -3467,12 +3467,12 @@ INSERT INTO t2 VALUES
 EXPLAIN
 SELECT a, c, d, f FROM t1,t2 WHERE a=c AND b BETWEEN 4 AND 6;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using MRR
+1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Rowid-ordered scan
 1	SIMPLE	t2	ref	c	c	5	test.t1.a	2	
 EXPLAIN
 SELECT a, c, d, f FROM t1,t2 WHERE a=c AND b BETWEEN 4 AND 6 AND a > 0;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY,b	b	5	NULL	3	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t2	ref	c	c	5	test.t1.a	2	
 DROP TABLE t1, t2;
 create table t1 (
@ -3562,19 +3562,19 @@ EXPLAIN SELECT t2.*
 FROM t1 JOIN t2 ON t2.fk=t1.pk
 WHERE t2.fk < 'c' AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	3	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	3	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where
 EXPLAIN SELECT t2.* 
 FROM t1 JOIN t2 ON t2.fk=t1.pk 
 WHERE t2.fk BETWEEN 'a' AND 'b' AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where
 EXPLAIN SELECT t2.* 
 FROM t1 JOIN t2 ON t2.fk=t1.pk 
 WHERE t2.fk IN ('a','b') AND t2.pk=t1.fk;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t2	eq_ref	PRIMARY	PRIMARY	18	test.t1.fk	1	Using where
 DROP TABLE t1,t2;
 CREATE TABLE t1 (a int, b varchar(20) NOT NULL, PRIMARY KEY(a));
@ -3608,7 +3608,7 @@ WHERE t1.id = 8 AND t2.i BETWEEN t1.b AND t1.e AND
 t3.a=t2.a AND t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si	si	5	NULL	4	Using index condition; Using where; Using MRR
+1	SIMPLE	t2	range	si	si	5	NULL	4	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 EXPLAIN
 SELECT t3.a FROM t1,t2,t3
@ -3616,7 +3616,7 @@ WHERE t1.id = 8 AND t2.i BETWEEN t1.b AND t1.e AND
 t3.a=t2.a AND t3.c IN ('bb','ee') ;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si,ai	si	5	NULL	4	Using index condition; Using where; Using MRR
+1	SIMPLE	t2	range	si,ai	si	5	NULL	4	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 EXPLAIN 
 SELECT t3.a FROM t1,t2 FORCE INDEX (si),t3
@ -3624,7 +3624,7 @@ WHERE t1.id = 8 AND (t2.i=t1.b OR t2.i=t1.e) AND t3.a=t2.a AND
 t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si	si	5	NULL	2	Using index condition; Using where; Using MRR
+1	SIMPLE	t2	range	si	si	5	NULL	2	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 EXPLAIN 
 SELECT t3.a FROM t1,t2,t3
@ -3632,7 +3632,7 @@ WHERE t1.id = 8 AND (t2.i=t1.b OR t2.i=t1.e) AND t3.a=t2.a AND
 t3.c IN ('bb','ee');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t2	range	si,ai	si	5	NULL	2	Using index condition; Using where; Using MRR
+1	SIMPLE	t2	range	si,ai	si	5	NULL	2	Using index condition; Using where; Rowid-ordered scan
 1	SIMPLE	t3	eq_ref	PRIMARY,ci	PRIMARY	4	test.t2.a	1	Using where
 DROP TABLE t1,t2,t3;
 CREATE TABLE t1 ( f1 int primary key, f2 int, f3 int, f4 int, f5 int, f6 int, checked_out int);
@ -3752,7 +3752,7 @@ AND t1.ts BETWEEN t2.dt1 AND t2.dt2
 AND t1.ts BETWEEN "2006-01-01" AND "2006-12-31";
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t2	const	PRIMARY	PRIMARY	4	const	1	
-1	SIMPLE	t1	range	ts	ts	4	NULL	1	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	ts	ts	4	NULL	1	Using index condition; Using where; Rowid-ordered scan
 Warnings:
 Warning	1292	Incorrect datetime value: '2999-12-31 00:00:00' for column 'ts' at row 1
 SELECT * FROM t1 LEFT JOIN t2 ON (t1.a=t2.a) WHERE t1.a=30
@ -4376,12 +4376,12 @@ CREATE TABLE t1 (a INT KEY, b INT);
 INSERT INTO t1 VALUES (1,1), (2,2), (3,3), (4,4);
 EXPLAIN EXTENDED SELECT a, b FROM t1 WHERE a > 1 AND a = b LIMIT 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Rowid-ordered scan
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`b` = `test`.`t1`.`a`) and (`test`.`t1`.`a` > 1)) limit 2
 EXPLAIN EXTENDED SELECT a, b FROM t1 WHERE a > 1 AND b = a LIMIT 2;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Using MRR
+1	SIMPLE	t1	range	PRIMARY	PRIMARY	4	NULL	3	100.00	Using index condition; Using where; Rowid-ordered scan
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t1` where ((`test`.`t1`.`b` = `test`.`t1`.`a`) and (`test`.`t1`.`a` > 1)) limit 2
 DROP TABLE t1;
--- a/mysql-test/r/subselect3.result
+++ b/mysql-test/r/subselect3.result
@ -1135,7 +1135,7 @@ and t4.pk=t1.c);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	100	
 1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
-2	SUBQUERY	t1	range	kp1	kp1	5	NULL	48	Using index condition; Using where; Using MRR
+2	SUBQUERY	t1	range	kp1	kp1	5	NULL	48	Using index condition; Using where; Rowid-ordered scan
 2	SUBQUERY	t4	eq_ref	PRIMARY	PRIMARY	4	test.t1.c	1	Using index
 drop table t1, t3, t4;
 create table t1 (a int) as select * from t0 where a < 5;
--- a/mysql-test/r/subselect3_jcl6.result
+++ b/mysql-test/r/subselect3_jcl6.result
@ -167,7 +167,7 @@ from t3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	
 2	DEPENDENT SUBQUERY	t1	ref_or_null	a	a	5	func	4	100.00	Using where; Full scan on NULL key
-2	DEPENDENT SUBQUERY	t2	ref	a	a	5	test.t1.b	1	100.00	Using where; Using join buffer (flat, BKA join)
+2	DEPENDENT SUBQUERY	t2	ref	a	a	5	test.t1.b	1	100.00	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 Warnings:
 Note	1276	Field or reference 'test.t3.oref' of SELECT #2 was resolved in SELECT #1
 Note	1003	select `test`.`t3`.`a` AS `a`,`test`.`t3`.`oref` AS `oref`,<expr_cache><`test`.`t3`.`a`,`test`.`t3`.`oref`>(<in_optimizer>(`test`.`t3`.`a`,<exists>(select 1 from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`b`) and (`test`.`t2`.`b` = `test`.`t3`.`oref`) and trigcond(((<cache>(`test`.`t3`.`a`) = `test`.`t1`.`a`) or isnull(`test`.`t1`.`a`)))) having trigcond(<is_not_null_test>(`test`.`t1`.`a`))))) AS `Z` from `test`.`t3`
@ -195,7 +195,7 @@ from t3;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	3	100.00	
 2	DEPENDENT SUBQUERY	t1	ref	a	a	4	func	2	100.00	Using where; Full scan on NULL key
-2	DEPENDENT SUBQUERY	t2	ref	a	a	4	test.t1.b	1	100.00	Using where; Using join buffer (flat, BKA join)
+2	DEPENDENT SUBQUERY	t2	ref	a	a	4	test.t1.b	1	100.00	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 Warnings:
 Note	1276	Field or reference 'test.t3.oref' of SELECT #2 was resolved in SELECT #1
 Note	1003	select `test`.`t3`.`a` AS `a`,`test`.`t3`.`oref` AS `oref`,<expr_cache><`test`.`t3`.`a`,`test`.`t3`.`oref`>(<in_optimizer>(`test`.`t3`.`a`,<exists>(select 1 from `test`.`t1` join `test`.`t2` where ((`test`.`t2`.`a` = `test`.`t1`.`b`) and (`test`.`t2`.`b` = `test`.`t3`.`oref`) and trigcond((<cache>(`test`.`t3`.`a`) = `test`.`t1`.`a`)))))) AS `Z` from `test`.`t3`
@ -739,7 +739,7 @@ WHERE t3.name='xxx' AND t2.id=t3.id);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	4	Using where
 2	DEPENDENT SUBQUERY	t2	eq_ref	PRIMARY	PRIMARY	4	func	1	Using where; Using index; Full scan on NULL key
-2	DEPENDENT SUBQUERY	t3	eq_ref	PRIMARY	PRIMARY	4	func	1	Using index condition(BKA); Using where; Full scan on NULL key; Using join buffer (flat, BKA join)
+2	DEPENDENT SUBQUERY	t3	eq_ref	PRIMARY	PRIMARY	4	func	1	Using index condition(BKA); Using where; Full scan on NULL key; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 SELECT * FROM t1
 WHERE t1.id NOT IN (SELECT t2.id FROM t2,t3 
 WHERE t3.name='xxx' AND t2.id=t3.id);
@ -1142,7 +1142,7 @@ and t4.pk=t1.c);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t3	ALL	NULL	NULL	NULL	NULL	100	
 1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
-2	SUBQUERY	t1	range	kp1	kp1	5	NULL	48	Using index condition; Using where; Using MRR
+2	SUBQUERY	t1	range	kp1	kp1	5	NULL	48	Using index condition; Using where; Rowid-ordered scan
 2	SUBQUERY	t4	eq_ref	PRIMARY	PRIMARY	4	test.t1.c	1	Using index
 drop table t1, t3, t4;
 create table t1 (a int) as select * from t0 where a < 5;
@ -1175,7 +1175,7 @@ insert into t3 select A.a + 10*B.a, 'filler' from t0 A, t0 B;
 explain select * from t3 where a in (select a from t2) and (a > 5 or a < 10);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	2	
-1	PRIMARY	t3	ref	a	a	5	test.t2.a	1	Using join buffer (flat, BKA join)
+1	PRIMARY	t3	ref	a	a	5	test.t2.a	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	Using where
 select * from t3 where a in (select a from t2);
 a	filler
@ -1224,7 +1224,7 @@ explain select * from t1, t3 where t3.a in (select a from t2) and (t3.a < 10 or
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	10	Using where
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
-1	PRIMARY	t3	ref	a	a	5	test.t2.a	10	Using join buffer (flat, BKA join)
+1	PRIMARY	t3	ref	a	a	5	test.t2.a	10	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	10	Using where
 explain select straight_join * from t1 A, t1 B where A.a in (select a from t2);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
@ -1254,14 +1254,14 @@ explain select * from t0, t3 where t3.a in (select a from t2) and (t3.a < 10 or
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t0	system	NULL	NULL	NULL	NULL	1	
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
-1	PRIMARY	t3	ref	a	a	5	test.t2.a	10	Using join buffer (flat, BKA join)
+1	PRIMARY	t3	ref	a	a	5	test.t2.a	10	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 2	SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	10	Using where
 create table t4 as select a as x, a as y from t1;
 explain select * from t0, t3 where (t3.a, t3.b) in (select x,y from t4) and (t3.a < 10 or t3.a >30);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t0	system	NULL	NULL	NULL	NULL	1	
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
-1	PRIMARY	t3	ref	a	a	5	test.t4.x	10	Using where; Using join buffer (flat, BKA join)
+1	PRIMARY	t3	ref	a	a	5	test.t4.x	10	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 2	SUBQUERY	t4	ALL	NULL	NULL	NULL	NULL	10	Using where
 drop table t0,t1,t2,t3,t4;
 create table t0 (a int);
@ -1412,7 +1412,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	2	1.00	
 1	PRIMARY	a	index	PRIMARY	PRIMARY	4	NULL	2	100.00	Using where; Using index; Using join buffer (flat, BNL join)
 2	SUBQUERY	cona	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where
-2	SUBQUERY	c	eq_ref	PRIMARY	PRIMARY	4	test.cona.idContact	1	100.00	Using join buffer (flat, BKA join)
+2	SUBQUERY	c	eq_ref	PRIMARY	PRIMARY	4	test.cona.idContact	1	100.00	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 Warnings:
 Note	1003	select `test`.`a`.`idIndividual` AS `idIndividual` from `test`.`t1` `a` semi join (`test`.`t3` `cona` join `test`.`t2` `c`) where ((`test`.`c`.`idContact` = `test`.`cona`.`idContact`) and (`test`.`a`.`idIndividual` = `test`.`c`.`idObj`) and (`test`.`cona`.`postalStripped` = 'T2H3B2'))
 drop table t1,t2,t3;
--- a/mysql-test/r/subselect4.result
+++ b/mysql-test/r/subselect4.result
@ -954,28 +954,28 @@ EXPLAIN
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
-2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10);
 f1	f2
 EXPLAIN
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2 WHERE f3 > 10);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
-2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2 WHERE f3 > 10);
 f1	f2
 EXPLAIN
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2 WHERE f3 > 10);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
-2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2 WHERE f3 > 10);
 f1	f2
 EXPLAIN
 SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10) as not_in;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10) as not_in;
 not_in
 NULL
@ -983,21 +983,21 @@ EXPLAIN
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
-2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10);
 f1	f2
 EXPLAIN
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2 WHERE f3 > 10);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
-2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2 WHERE f3 > 10);
 f1	f2
 EXPLAIN
 SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10) as not_in;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10) as not_in;
 not_in
 NULL
@ -1005,7 +1005,7 @@ EXPLAIN
 SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) > 7) as not_in;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) > 7) as not_in;
 not_in
 1
@ -1013,7 +1013,7 @@ EXPLAIN
 SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) is null) as not_in;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) is null) as not_in;
 not_in
 NULL
@ -1021,7 +1021,7 @@ EXPLAIN
 SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2 WHERE f3 > 10) as not_in;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2 WHERE f3 > 10) as not_in;
 not_in
 NULL
@ -1029,7 +1029,7 @@ EXPLAIN
 SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2 WHERE f3 > 10) as not_in;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2 WHERE f3 > 10) as not_in;
 not_in
 NULL
@ -1045,28 +1045,28 @@ EXPLAIN
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10);
 f1	f2
 EXPLAIN
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2 WHERE f3 > 10);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3+f4, min(f4) FROM t2 WHERE f3 > 10);
 f1	f2
 EXPLAIN
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2 WHERE f3 > 10);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, min(f4)+max(f4) FROM t2 WHERE f3 > 10);
 f1	f2
 EXPLAIN
 SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10) as not_in;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT (2, 0) NOT IN (SELECT f3, min(f4) FROM t2 WHERE f3 > 10) as not_in;
 not_in
 NULL
@ -1074,21 +1074,21 @@ EXPLAIN
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10);
 f1	f2
 EXPLAIN
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2 WHERE f3 > 10);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT * FROM t1 WHERE (2, 0) NOT IN (SELECT f3, f3 + count(f4) FROM t2 WHERE f3 > 10);
 f1	f2
 EXPLAIN
 SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10) as not_in;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10) as not_in;
 not_in
 NULL
@ -1096,7 +1096,7 @@ EXPLAIN
 SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) > 7) as not_in;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) > 7) as not_in;
 not_in
 1
@ -1104,7 +1104,7 @@ EXPLAIN
 SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) is null) as not_in;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT (2, 0) NOT IN (SELECT f3, count(f4) FROM t2 WHERE f3 > 10 HAVING max(f4) is null) as not_in;
 not_in
 NULL
@ -1112,7 +1112,7 @@ EXPLAIN
 SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2 WHERE f3 > 10) as not_in;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4) FROM t2 WHERE f3 > 10) as not_in;
 not_in
 NULL
@ -1120,7 +1120,7 @@ EXPLAIN
 SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2 WHERE f3 > 10) as not_in;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	No tables used
-2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Using MRR
+2	DEPENDENT SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	1	Using index condition; Rowid-ordered scan
 SELECT (2, 0) NOT IN (SELECT max(f3+f3), count(f4)+f3 FROM t2 WHERE f3 > 10) as not_in;
 not_in
 NULL
--- a/mysql-test/r/subselect_mat.result
+++ b/mysql-test/r/subselect_mat.result
@ -1213,7 +1213,7 @@ EXPLAIN SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
 1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
-2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Using MRR
+2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Rowid-ordered scan
 SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0);
 pk
 2
@ -1363,7 +1363,7 @@ EXPLAIN SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	
 1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	5	func	1	
-2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Using MRR
+2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	2	Using index condition; Rowid-ordered scan
 SELECT pk FROM t1 WHERE (a) IN (SELECT a FROM t2 WHERE pk > 0);
 pk
 2
--- a/mysql-test/r/subselect_sj.result
+++ b/mysql-test/r/subselect_sj.result
@ -812,7 +812,7 @@ EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (a, b) IN (SELECT a, b FROM t2 WHERE pk
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
 1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	13	func	1	1.00	
-2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using MRR
+2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Rowid-ordered scan
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (a, b) IN (SELECT a, b FROM t2 WHERE pk > 0);
@ -821,7 +821,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, c) IN (SELECT b, c FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`c` = `test`.`t1`.`c`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, c) IN (SELECT b, c FROM t2 WHERE pk > 0);
@ -831,7 +831,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, d) IN (SELECT b, d FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`d` = `test`.`t1`.`d`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, d) IN (SELECT b, d FROM t2 WHERE pk > 0);
@ -840,7 +840,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, e) IN (SELECT b, e FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`e` = `test`.`t1`.`e`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, e) IN (SELECT b, e FROM t2 WHERE pk > 0);
@ -850,7 +850,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, f) IN (SELECT b, f FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`f` = `test`.`t1`.`f`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, f) IN (SELECT b, f FROM t2 WHERE pk > 0);
@ -860,7 +860,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, g) IN (SELECT b, g FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`g` = `test`.`t1`.`g`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, g) IN (SELECT b, g FROM t2 WHERE pk > 0);
@ -870,7 +870,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, h) IN (SELECT b, h FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`h` = `test`.`t1`.`h`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, h) IN (SELECT b, h FROM t2 WHERE pk > 0);
@ -880,7 +880,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, i) IN (SELECT b, i FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`i` = `test`.`t1`.`i`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, i) IN (SELECT b, i FROM t2 WHERE pk > 0);
@ -890,7 +890,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, j) IN (SELECT b, j FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`j` = `test`.`t1`.`j`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, j) IN (SELECT b, j FROM t2 WHERE pk > 0);
@ -900,7 +900,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, k) IN (SELECT b, k FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`k` = `test`.`t1`.`k`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, k) IN (SELECT b, k FROM t2 WHERE pk > 0);
--- a/mysql-test/r/subselect_sj2.result
+++ b/mysql-test/r/subselect_sj2.result
@ -311,7 +311,7 @@ t2.Code IN (SELECT Country FROM t3
 WHERE Language='English' AND Percentage > 10 AND
 t2.Population > 100000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1	range	Population,Country	Population	4	NULL	1	Using index condition; Using MRR
+1	PRIMARY	t1	range	Population,Country	Population	4	NULL	1	Using index condition; Rowid-ordered scan
 1	PRIMARY	t3	eq_ref	PRIMARY,Percentage	PRIMARY	33	test.t1.Country,const	1	Using index condition; Using where
 1	PRIMARY	t2	eq_ref	PRIMARY,Population	PRIMARY	3	test.t1.Country	1	Using where
 DROP TABLE t1,t2,t3;
--- a/mysql-test/r/subselect_sj2_jcl6.result
+++ b/mysql-test/r/subselect_sj2_jcl6.result
@ -40,7 +40,7 @@ a	b
 explain select * from t2 where b in (select a from t1);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	3	
-1	PRIMARY	t2	ref	b	b	5	test.t1.a	2	Using join buffer (flat, BKA join)
+1	PRIMARY	t2	ref	b	b	5	test.t1.a	2	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 2	SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
 select * from t2 where b in (select a from t1);
 a	b
@ -83,7 +83,7 @@ from t0 A, t0 B where B.a <5;
 explain select * from t3 where b in (select a from t0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	subselect2	ALL	unique_key	NULL	NULL	NULL	10	
-1	PRIMARY	t3	ref	b	b	5	test.t0.a	1	Using join buffer (flat, BKA join)
+1	PRIMARY	t3	ref	b	b	5	test.t0.a	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 2	SUBQUERY	t0	ALL	NULL	NULL	NULL	NULL	10	Using where
 set @save_ecp= @@engine_condition_pushdown;
 set engine_condition_pushdown=0;
@ -318,9 +318,9 @@ t2.Code IN (SELECT Country FROM t3
 WHERE Language='English' AND Percentage > 10 AND
 t2.Population > 100000);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t1	range	Population,Country	Population	4	NULL	1	Using index condition; Using MRR
+1	PRIMARY	t1	range	Population,Country	Population	4	NULL	1	Using index condition; Rowid-ordered scan
-1	PRIMARY	t3	eq_ref	PRIMARY,Percentage	PRIMARY	33	test.t1.Country,const	1	Using index condition; Using where; Using join buffer (flat, BKA join)
+1	PRIMARY	t3	eq_ref	PRIMARY,Percentage	PRIMARY	33	test.t1.Country,const	1	Using index condition; Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	PRIMARY	t2	eq_ref	PRIMARY,Population	PRIMARY	3	test.t1.Country	1	Using where; Using join buffer (incremental, BKA join)
+1	PRIMARY	t2	eq_ref	PRIMARY,Population	PRIMARY	3	test.t1.Country	1	Using where; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 DROP TABLE t1,t2,t3;
 CREATE TABLE t1 (
 Code char(3) NOT NULL DEFAULT '',
@ -434,8 +434,8 @@ where t0.a in ( select t1.a from t1,t2 where t2.a=t0.a and
 t1.b=t2.b);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	5	100.00	Using where; Start temporary
-1	PRIMARY	t1	ref	a	a	5	test.t0.a	1	100.00	Using join buffer (flat, BKA join)
+1	PRIMARY	t1	ref	a	a	5	test.t0.a	1	100.00	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	PRIMARY	t2	eq_ref	PRIMARY	PRIMARY	4	test.t0.a	1	100.00	Using where; End temporary; Using join buffer (incremental, BKA join)
+1	PRIMARY	t2	eq_ref	PRIMARY	PRIMARY	4	test.t0.a	1	100.00	Using where; End temporary; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 Warnings:
 Note	1276	Field or reference 'test.t0.a' of SELECT #2 was resolved in SELECT #1
 Note	1003	select `test`.`t0`.`a` AS `a` from `test`.`t2` semi join (`test`.`t1`) join `test`.`t0` where ((`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t1`.`a` = `test`.`t0`.`a`) and (`test`.`t2`.`a` = `test`.`t0`.`a`))
--- a/mysql-test/r/subselect_sj_jcl6.result
+++ b/mysql-test/r/subselect_sj_jcl6.result
@ -60,7 +60,7 @@ flattening a nested subquery
 explain select * from t1 where a in (select pk from t10 where t10.a in (select pk from t12));
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	Using where
-1	PRIMARY	t10	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where; Using join buffer (flat, BKA join)
+1	PRIMARY	t10	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 1	PRIMARY	t12	eq_ref	PRIMARY	PRIMARY	4	test.t10.a	1	Using index
 select * from t1 where a in (select pk from t10 where t10.a in (select pk from t12));
 a	b
@ -71,7 +71,7 @@ flattening subquery w/ several tables
 explain extended select * from t1 where a in (select t10.pk from t10, t12 where t12.pk=t10.a);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	3	100.00	Using where
-1	PRIMARY	t10	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	100.00	Using where; Using join buffer (flat, BKA join)
+1	PRIMARY	t10	eq_ref	PRIMARY	PRIMARY	4	test.t1.a	1	100.00	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 1	PRIMARY	t12	eq_ref	PRIMARY	PRIMARY	4	test.t10.a	1	100.00	Using index
 Warnings:
 Note	1003	select `test`.`t1`.`a` AS `a`,`test`.`t1`.`b` AS `b` from `test`.`t10` join `test`.`t12` join `test`.`t1` where ((`test`.`t10`.`pk` = `test`.`t1`.`a`) and (`test`.`t12`.`pk` = `test`.`t10`.`a`))
@ -516,7 +516,7 @@ EXPLAIN EXTENDED SELECT vkey FROM t0 WHERE pk IN
 (SELECT t1.pk FROM t0 t1 JOIN t0 t2 ON t2.vkey = t1.vnokey);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t0	ALL	PRIMARY	NULL	NULL	NULL	5	100.00	
-1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t0.pk	1	100.00	Using where; Using join buffer (flat, BKA join)
+1	PRIMARY	t1	eq_ref	PRIMARY	PRIMARY	4	test.t0.pk	1	100.00	Using where; Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
 1	PRIMARY	t2	ref	vkey	vkey	4	test.t1.vnokey	2	100.00	Using index; FirstMatch(t1)
 Warnings:
 Note	1003	select `test`.`t0`.`vkey` AS `vkey` from `test`.`t0` `t1` semi join (`test`.`t0` `t2`) join `test`.`t0` where ((`test`.`t2`.`vkey` = `test`.`t1`.`vnokey`) and (`test`.`t1`.`pk` = `test`.`t0`.`pk`))
@ -820,7 +820,7 @@ EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (a, b) IN (SELECT a, b FROM t2 WHERE pk
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
 1	PRIMARY	subselect2	eq_ref	unique_key	unique_key	13	func	1	1.00	
-2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using MRR
+2	SUBQUERY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Rowid-ordered scan
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (a, b) IN (SELECT a, b FROM t2 WHERE pk > 0);
@ -829,7 +829,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, c) IN (SELECT b, c FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1); Using join buffer (flat, BNL join)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1); Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`c` = `test`.`t1`.`c`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, c) IN (SELECT b, c FROM t2 WHERE pk > 0);
@ -839,7 +839,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, d) IN (SELECT b, d FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1); Using join buffer (flat, BNL join)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1); Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`d` = `test`.`t1`.`d`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, d) IN (SELECT b, d FROM t2 WHERE pk > 0);
@ -848,7 +848,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, e) IN (SELECT b, e FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1); Using join buffer (flat, BNL join)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1); Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`e` = `test`.`t1`.`e`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, e) IN (SELECT b, e FROM t2 WHERE pk > 0);
@ -858,7 +858,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, f) IN (SELECT b, f FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1); Using join buffer (flat, BNL join)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1); Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`f` = `test`.`t1`.`f`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, f) IN (SELECT b, f FROM t2 WHERE pk > 0);
@ -868,7 +868,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, g) IN (SELECT b, g FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1); Using join buffer (flat, BNL join)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1); Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`g` = `test`.`t1`.`g`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, g) IN (SELECT b, g FROM t2 WHERE pk > 0);
@ -878,7 +878,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, h) IN (SELECT b, h FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1); Using join buffer (flat, BNL join)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1); Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`h` = `test`.`t1`.`h`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, h) IN (SELECT b, h FROM t2 WHERE pk > 0);
@ -888,7 +888,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, i) IN (SELECT b, i FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1); Using join buffer (flat, BNL join)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1); Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`i` = `test`.`t1`.`i`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, i) IN (SELECT b, i FROM t2 WHERE pk > 0);
@ -898,7 +898,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, j) IN (SELECT b, j FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1); Using join buffer (flat, BNL join)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1); Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`j` = `test`.`t1`.`j`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, j) IN (SELECT b, j FROM t2 WHERE pk > 0);
@ -908,7 +908,7 @@ pk
 EXPLAIN EXTENDED SELECT pk FROM t1 WHERE (b, k) IN (SELECT b, k FROM t2 WHERE pk > 0);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
 1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	
-1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Using MRR; FirstMatch(t1); Using join buffer (flat, BNL join)
+1	PRIMARY	t2	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using index condition; Using where; Rowid-ordered scan; FirstMatch(t1); Using join buffer (flat, BNL join)
 Warnings:
 Note	1003	select `test`.`t1`.`pk` AS `pk` from `test`.`t1` semi join (`test`.`t2`) where ((`test`.`t2`.`k` = `test`.`t1`.`k`) and (`test`.`t2`.`b` = `test`.`t1`.`b`) and (`test`.`t2`.`pk` > 0))
 SELECT pk FROM t1 WHERE (b, k) IN (SELECT b, k FROM t2 WHERE pk > 0);
@ -1268,8 +1268,8 @@ SELECT * FROM t0 WHERE t0.a IN
 (SELECT t1.a FROM t1, t2 WHERE t2.a=t0.a AND t1.b=t2.b);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t0	ALL	NULL	NULL	NULL	NULL	5	Using where; Start temporary
-1	PRIMARY	t1	ref	a	a	5	test.t0.a	1	Using join buffer (flat, BKA join)
+1	PRIMARY	t1	ref	a	a	5	test.t0.a	1	Using join buffer (flat, BKA join); Key-ordered Rowid-ordered scan
-1	PRIMARY	t2	eq_ref	PRIMARY	PRIMARY	4	test.t0.a	1	Using where; End temporary; Using join buffer (incremental, BKA join)
+1	PRIMARY	t2	eq_ref	PRIMARY	PRIMARY	4	test.t0.a	1	Using where; End temporary; Using join buffer (incremental, BKA join); Key-ordered Rowid-ordered scan
 SELECT * FROM t0 WHERE t0.a IN 
 (SELECT t1.a FROM t1, t2 WHERE t2.a=t0.a AND t1.b=t2.b);
 a
--- a/mysql-test/r/table_elim.result
+++ b/mysql-test/r/table_elim.result
@ -128,7 +128,7 @@ Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` where (`f`.`id` in (1,2,3
 This should use facts and a1 tables:
 explain extended select id from v1 where attr1 between 12 and 14;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	a1	range	PRIMARY,attr1	attr1	5	NULL	2	100.00	Using index condition; Using MRR
+1	PRIMARY	a1	range	PRIMARY,attr1	attr1	5	NULL	2	100.00	Using index condition; Rowid-ordered scan
 1	PRIMARY	f	eq_ref	PRIMARY	PRIMARY	4	test.a1.id	1	100.00	Using index
 Warnings:
 Note	1276	Field or reference 'test.a2.id' of SELECT #3 was resolved in SELECT #1
@ -136,7 +136,7 @@ Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` join `test`.`t1` `a1` whe
 This should use facts, a2 and its subquery:
 explain extended select id from v1 where attr2 between 12 and 14;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	a2	range	PRIMARY,attr2	attr2	5	NULL	5	100.00	Using index condition; Using where; Using MRR
+1	PRIMARY	a2	range	PRIMARY,attr2	attr2	5	NULL	5	100.00	Using index condition; Using where; Rowid-ordered scan
 1	PRIMARY	f	eq_ref	PRIMARY	PRIMARY	4	test.a2.id	1	100.00	Using index
 3	DEPENDENT SUBQUERY	t2	ref	PRIMARY	PRIMARY	4	test.a2.id	2	100.00	Using index
 Warnings:
@ -156,7 +156,7 @@ Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` where (`f`.`id` in (1,2,3
 This should use facts and a1 tables:
 explain extended select id from v2 where attr1 between 12 and 14;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	a1	range	PRIMARY,attr1	attr1	5	NULL	2	100.00	Using index condition; Using MRR
+1	PRIMARY	a1	range	PRIMARY,attr1	attr1	5	NULL	2	100.00	Using index condition; Rowid-ordered scan
 1	PRIMARY	f	eq_ref	PRIMARY	PRIMARY	4	test.a1.id	1	100.00	Using index
 Warnings:
 Note	1276	Field or reference 'test.f.id' of SELECT #3 was resolved in SELECT #1
@ -164,7 +164,7 @@ Note	1003	select `f`.`id` AS `id` from `test`.`t0` `f` join `test`.`t1` `a1` whe
 This should use facts, a2 and its subquery:
 explain extended select id from v2 where attr2 between 12 and 14;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra
-1	PRIMARY	a2	range	PRIMARY,attr2	attr2	5	NULL	5	100.00	Using index condition; Using MRR
+1	PRIMARY	a2	range	PRIMARY,attr2	attr2	5	NULL	5	100.00	Using index condition; Rowid-ordered scan
 1	PRIMARY	f	eq_ref	PRIMARY	PRIMARY	4	test.a2.id	1	100.00	Using where; Using index
 3	DEPENDENT SUBQUERY	t2	ref	PRIMARY	PRIMARY	4	test.f.id	2	100.00	Using index
 Warnings:
@ -416,7 +416,7 @@ select t1.*
 from t1 left join t2 on (t2.pk=3 and t2.b=3) or (t2.pk= 4 and t2.b=3);
 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	range	PRIMARY	PRIMARY	4	NULL	2	Using where; Using MRR
+1	SIMPLE	t2	range	PRIMARY	PRIMARY	4	NULL	2	Using where; Rowid-ordered scan
 drop table t1, t2;
 #
 # LPBUG#523593: Running RQG optimizer_no_subquery crashes MariaDB
--- a/sql/handler.h
+++ b/sql/handler.h
@ -1358,6 +1358,15 @@ void get_sweep_read_cost(TABLE *table, ha_rows nrows, bool interrupted,
 */
 #define HA_MRR_MATERIALIZED_KEYS 256
 #define HA_MRR_IMPLEMENTATION_FLAG1 512
 #define HA_MRR_IMPLEMENTATION_FLAG2 1024
 #define HA_MRR_IMPLEMENTATION_FLAG3 2048
 #define HA_MRR_IMPLEMENTATION_FLAG4 4096
 #define HA_MRR_IMPLEMENTATION_FLAG5 8192
 #define HA_MRR_IMPLEMENTATION_FLAG6 16384
 #define HA_MRR_IMPLEMENTATION_FLAGS \
  (512 | 1024 | 2048 | 4096 | 8192 | 16384)
 /*
  This is a buffer area that the handler can use to store rows.
@ -1863,14 +1872,40 @@ public:
  virtual ha_rows multi_range_read_info_const(uint keyno, RANGE_SEQ_IF *seq,
                                              void *seq_init_param, 
                                              uint n_ranges, uint *bufsz,
-                                              uint *flags, COST_VECT *cost);
+                                              uint *mrr_mode, COST_VECT *cost);
  virtual ha_rows multi_range_read_info(uint keyno, uint n_ranges, uint keys,
                                        uint key_parts, uint *bufsz, 
-                                        uint *flags, COST_VECT *cost);
+                                        uint *mrr_mode, COST_VECT *cost);
  virtual int multi_range_read_init(RANGE_SEQ_IF *seq, void *seq_init_param,
-                                    uint n_ranges, uint mode, 
+                                    uint n_ranges, uint mrr_mode, 
                                    HANDLER_BUFFER *buf);
  virtual int multi_range_read_next(range_id_t *range_info);
  /*
    Return string representation of the MRR plan.
    This is intended to be used for EXPLAIN, via the following scenario:
    1. SQL layer calls handler->multi_range_read_info().
    1.1. Storage engine figures out whether it will use some non-default
         MRR strategy, sets appropritate bits in *mrr_mode, and returns 
         control to SQL layer
    2. SQL layer remembers the returned mrr_mode
    3. SQL layer compares various options and choses the final query plan. As
       a part of that, it makes a choice of whether to use the MRR strategy
       picked in 1.1
    4. EXPLAIN code converts the query plan to its text representation. If MRR
       strategy is part of the plan, it calls
       multi_range_read_explain_info(mrr_mode) to get a text representation of
       the picked MRR strategy.
    @param mrr_mode   Mode which was returned by multi_range_read_info[_const]
    @param str        INOUT string to be printed for EXPLAIN
    @param str_end    End of the string buffer. The function is free to put the 
                      string into [str..str_end] memory range.
  */
  virtual int multi_range_read_explain_info(uint mrr_mode, char *str, 
                                            size_t size)
  { return 0; }
  virtual int read_range_first(const key_range *start_key,
                               const key_range *end_key,
                               bool eq_range, bool sorted);
--- a/sql/multi_range_read.cc
+++ b/sql/multi_range_read.cc
@ -1372,7 +1372,7 @@ ha_rows DsMrr_impl::dsmrr_info(uint keyno, uint n_ranges, uint rows,
  DBUG_ASSERT(!res);
  if ((*flags & HA_MRR_USE_DEFAULT_IMPL) || 
-      choose_mrr_impl(keyno, rows, &def_flags, &def_bufsz, cost))
+      choose_mrr_impl(keyno, rows, flags, bufsz, cost))
  {
    /* Default implementation is choosen */
    DBUG_PRINT("info", ("Default MRR implementation choosen"));
@ -1517,11 +1517,13 @@ bool DsMrr_impl::choose_mrr_impl(uint keyno, ha_rows rows, uint *flags,
  bool doing_cpk_scan= check_cpk_scan(thd, keyno, *flags); 
  bool using_cpk= test(keyno == table->s->primary_key &&
                       primary_file->primary_key_is_clustered());
  *flags &= ~HA_MRR_IMPLEMENTATION_FLAGS;
  if (thd->variables.optimizer_use_mrr == 2 || *flags & HA_MRR_INDEX_ONLY ||
      (using_cpk && !doing_cpk_scan) || key_uses_partial_cols(table, keyno))
  {
    /* Use the default implementation */
    *flags |= HA_MRR_USE_DEFAULT_IMPL;
    *flags &= ~HA_MRR_IMPLEMENTATION_FLAGS;
    return TRUE;
  }
@ -1549,9 +1551,24 @@ bool DsMrr_impl::choose_mrr_impl(uint keyno, ha_rows rows, uint *flags,
    *cost= dsmrr_cost;
    res= FALSE;
    if ((using_cpk && doing_cpk_scan) ||
        (optimizer_flag(thd, OPTIMIZER_SWITCH_MRR_SORT_KEYS) &&
         *flags & HA_MRR_SINGLE_POINT))
    {
      *flags |= DSMRR_IMPL_SORT_KEYS;
    }
    if (!(using_cpk && doing_cpk_scan) &&
        !(*flags & HA_MRR_INDEX_ONLY))
    {
      *flags |= DSMRR_IMPL_SORT_ROWIDS;
    }
    /*
    if ((*flags & HA_MRR_SINGLE_POINT) && 
         optimizer_flag(thd, OPTIMIZER_SWITCH_MRR_SORT_KEYS))
      *flags |= HA_MRR_MATERIALIZED_KEYS;
    */
  }
  else
  {
@ -1561,6 +1578,38 @@ bool DsMrr_impl::choose_mrr_impl(uint keyno, ha_rows rows, uint *flags,
  return res;
 }
 /*
  Take the flags we've returned previously and print one of
  - Key-ordered scan
  - Rowid-ordered scan
  - Key-ordered Rowid-ordered scan
 */
 int DsMrr_impl::dsmrr_explain_info(uint mrr_mode, char *str, size_t size)
 {
  const char *key_ordered=   "Key-ordered scan";
  const char *rowid_ordered= "Rowid-ordered scan";
  const char *both_ordered=  "Key-ordered Rowid-ordered scan";
  const char *used_str="";
  const uint BOTH_FLAGS= (DSMRR_IMPL_SORT_KEYS | DSMRR_IMPL_SORT_ROWIDS);
  if (!(mrr_mode & HA_MRR_USE_DEFAULT_IMPL))
  {
    if ((mrr_mode & BOTH_FLAGS) == BOTH_FLAGS)
      used_str= both_ordered;
    else if (mrr_mode & DSMRR_IMPL_SORT_KEYS)
      used_str= key_ordered;
    else if (mrr_mode & DSMRR_IMPL_SORT_ROWIDS)
      used_str= rowid_ordered;
    uint used_str_len= strlen(used_str);
    uint copy_len= min(used_str_len, size);
    memcpy(str, used_str, size);
    return copy_len;
  }
  return 0;
 }
 static void get_sort_and_sweep_cost(TABLE *table, ha_rows nrows, COST_VECT *cost);
--- a/sql/multi_range_read.h
+++ b/sql/multi_range_read.h
@ -395,6 +395,9 @@ public:
 };
 #define DSMRR_IMPL_SORT_KEYS   HA_MRR_IMPLEMENTATION_FLAG1
 #define DSMRR_IMPL_SORT_ROWIDS HA_MRR_IMPLEMENTATION_FLAG2
 /*
  DS-MRR implementation for one table. Create/use one object of this class for
  each ha_{myisam/innobase/etc} object. That object will be further referred to
@ -548,6 +551,8 @@ public:
  ha_rows dsmrr_info_const(uint keyno, RANGE_SEQ_IF *seq, 
                            void *seq_init_param, uint n_ranges, uint *bufsz,
                            uint *flags, COST_VECT *cost);
  int dsmrr_explain_info(uint mrr_mode, char *str, size_t size);
 private:
  /* Buffer to store (key, range_id) pairs */
  Lifo_buffer *key_buffer;
--- a/sql/sql_join_cache.cc
+++ b/sql/sql_join_cache.cc
@ -2491,8 +2491,36 @@ void JOIN_CACHE::print_explain_comment(String *str)
  str->append(join_alg);
  str->append(STRING_WITH_LEN(" join"));
  str->append(STRING_WITH_LEN(")"));
- }
+}
-   
+
 static void add_mrr_explain_info(String *str, uint mrr_mode, handler *file)
 {
  char mrr_str_buf[128]={0};
  int len;
  len= file->multi_range_read_explain_info(mrr_mode, mrr_str_buf,
                                           sizeof(mrr_str_buf));
  if (len > 0)
  {
    str->append(STRING_WITH_LEN("; "));
    str->append(mrr_str_buf, len);
  }
 }
 void JOIN_CACHE_BKA::print_explain_comment(String *str)
 {
  JOIN_CACHE::print_explain_comment(str); 
  add_mrr_explain_info(str, mrr_mode, join_tab->table->file);
 }
 void JOIN_CACHE_BKAH::print_explain_comment(String *str)
 {
  JOIN_CACHE::print_explain_comment(str); 
  add_mrr_explain_info(str, mrr_mode, join_tab->table->file);
 }
 /* 
  Initialize a hashed join cache       
--- a/sql/sql_join_cache.h
+++ b/sql/sql_join_cache.h
@ -637,7 +637,7 @@ public:
  enum_nested_loop_state join_records(bool skip_last);
  /* Add a comment on the join algorithm employed by the join cache */
-  void print_explain_comment(String *str);
+  virtual void print_explain_comment(String *str);
  virtual ~JOIN_CACHE() {}
  void reset_join(JOIN *j) { join= j; }
@ -1315,6 +1315,7 @@ public:
  /* Check index condition of the joined table for a record from BKA cache */
  bool skip_index_tuple(range_id_t range_info);
  void print_explain_comment(String *str);
 };
@ -1404,4 +1405,6 @@ public:
  /* Check index condition of the joined table for a record from BKAH cache */
  bool skip_index_tuple(range_id_t range_info);
  void print_explain_comment(String *str);
 };
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@ -19638,12 +19638,30 @@ static void select_describe(JOIN *join, bool need_tmp_table, bool need_order,
 	if (table->reginfo.not_exists_optimize)
 	  extra.append(STRING_WITH_LEN("; Not exists"));
        /*
        if (quick_type == QUICK_SELECT_I::QS_TYPE_RANGE &&
            !(((QUICK_RANGE_SELECT*)(tab->select->quick))->mrr_flags &
             HA_MRR_USE_DEFAULT_IMPL))
        {
 	  extra.append(STRING_WITH_LEN("; Using MRR"));
        }
        */
        if (quick_type == QUICK_SELECT_I::QS_TYPE_RANGE)
        {
          char mrr_str_buf[128];
          mrr_str_buf[0]=0;
          int len;
          uint mrr_flags= 
            ((QUICK_RANGE_SELECT*)(tab->select->quick))->mrr_flags;
          len= table->file->multi_range_read_explain_info(mrr_flags,
                                                          mrr_str_buf,
                                                          sizeof(mrr_str_buf));
          if (len > 0)
          {
            extra.append(STRING_WITH_LEN("; "));
            extra.append(mrr_str_buf, len);
          }
        }
 	if (need_tmp_table)
 	{
--- a/storage/maria/ha_maria.cc
+++ b/storage/maria/ha_maria.cc
@ -3665,6 +3665,11 @@ ha_rows ha_maria::multi_range_read_info(uint keyno, uint n_ranges, uint keys,
  return ds_mrr.dsmrr_info(keyno, n_ranges, keys, key_parts, bufsz, flags, cost);
 }
 int ha_maria::multi_range_read_explain_info(uint mrr_mode, char *str, 
                                            size_t size)
 {
  return ds_mrr.dsmrr_explain_info(mrr_mode, str, size);
 }
 /* MyISAM MRR implementation ends */
--- a/storage/maria/ha_maria.h
+++ b/storage/maria/ha_maria.h
@ -186,6 +186,7 @@ public:
  ha_rows multi_range_read_info(uint keyno, uint n_ranges, uint keys,
                                uint key_parts, uint *bufsz, 
                                uint *flags, COST_VECT *cost);
  int multi_range_read_explain_info(uint mrr_mode, char *str, size_t size);
  /* Index condition pushdown implementation */
  Item *idx_cond_push(uint keyno, Item* idx_cond);
--- a/storage/myisam/ha_myisam.cc
+++ b/storage/myisam/ha_myisam.cc
@ -2281,6 +2281,13 @@ ha_rows ha_myisam::multi_range_read_info(uint keyno, uint n_ranges, uint keys,
  return ds_mrr.dsmrr_info(keyno, n_ranges, keys, key_parts, bufsz, flags, cost);
 }
 int ha_myisam::multi_range_read_explain_info(uint mrr_mode, char *str, 
                                             size_t size)
 {
  return ds_mrr.dsmrr_explain_info(mrr_mode, str, size);
 }
 /* MyISAM MRR implementation ends */
--- a/storage/myisam/ha_myisam.h
+++ b/storage/myisam/ha_myisam.h
@ -170,7 +170,8 @@ public:
  ha_rows multi_range_read_info(uint keyno, uint n_ranges, uint keys,
                                uint key_parts, uint *bufsz, 
                                uint *flags, COST_VECT *cost);
-  
+  int multi_range_read_explain_info(uint mrr_mode, char *str, size_t size);
  /* Index condition pushdown implementation */
  Item *idx_cond_push(uint keyno, Item* idx_cond);
 private:
--- a/storage/xtradb/handler/ha_innodb.cc
+++ b/storage/xtradb/handler/ha_innodb.cc
@ -12139,6 +12139,10 @@ ha_rows ha_innobase::multi_range_read_info(uint keyno, uint n_ranges, uint keys,
  return res;
 }
 int ha_innobase::multi_range_read_explain_info(uint mrr_mode, char *str, size_t size)
 {
  return ds_mrr.dsmrr_explain_info(mrr_mode, str, size);
 }
 /* 
  A helper function used only in index_cond_func_innodb
--- a/storage/xtradb/handler/ha_innodb.h
+++ b/storage/xtradb/handler/ha_innodb.h
@ -237,6 +237,7 @@ public:
  ha_rows multi_range_read_info(uint keyno, uint n_ranges, uint keys,
                                uint key_parts, uint *bufsz, 
                                uint *flags, COST_VECT *cost);
  int multi_range_read_explain_info(uint mrr_mode, char *str, size_t size);
  DsMrr_impl ds_mrr;
  Item *idx_cond_push(uint keyno, Item* idx_cond);