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.

1 files changed, 2 insertions, 2 deletions

diff --git a/mysql-test/r/mix2_myisam.result b/mysql-test/r/mix2_myisam.result
index 676fd06fc8b..4172226b986 100644
--- 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);