diff --git a/include/my_base.h b/include/my_base.h
index cffe1c3caf4..dda64db2ef9 100644
--- a/include/my_base.h
+++ b/include/my_base.h
@@ -224,12 +224,17 @@ enum ha_base_keytype {
 /* poor old NISAM has 8-bit flags :-( */
 #define HA_SORT_ALLOWS_SAME	 128	/* Intern bit when sorting records */
 #endif
+#if MYSQL_VERSION_ID < 0x50200
 /*
   Key has a part that can have end space.  If this is an unique key
   we have to handle it differently from other unique keys as we can find
   many matching rows for one key (because end space are not compared)
 */
-#define HA_END_SPACE_KEY	4096
+#define HA_END_SPACE_KEY      0 /* was: 4096 */
+#else
+#error HA_END_SPACE_KEY is obsolete, please remove it
+#endif
+
 
 	/* These flags can be added to key-seg-flag */
 
diff --git a/mysql-test/r/func_str.result b/mysql-test/r/func_str.result
index 00642e1a570..c2c12f8d291 100644
--- a/mysql-test/r/func_str.result
+++ b/mysql-test/r/func_str.result
@@ -1143,9 +1143,9 @@ EXPLAIN EXTENDED
 SELECT * FROM t1 INNER JOIN t2 ON code=id 
 WHERE id='a12' AND (LENGTH(code)=5 OR code < 'a00');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t2	const	PRIMARY	PRIMARY	12	const	1	Using index
 1	SIMPLE	t1	ref	code	code	13	const	3	Using where; Using index
-1	SIMPLE	t2	ref	PRIMARY	PRIMARY	12	const	1	Using where; Using index
 Warnings:
-Note	1003	select `test`.`t1`.`code` AS `code`,`test`.`t2`.`id` AS `id` from `test`.`t1` join `test`.`t2` where ((`test`.`t1`.`code` = _latin1'a12') and (`test`.`t2`.`id` = _latin1'a12') and (length(`test`.`t1`.`code`) = 5))
+Note	1003	select `test`.`t1`.`code` AS `code`,`test`.`t2`.`id` AS `id` from `test`.`t1` join `test`.`t2` where ((`test`.`t1`.`code` = _latin1'a12') and (length(`test`.`t1`.`code`) = 5))
 DROP TABLE t1,t2;
 End of 5.0 tests
diff --git a/mysql-test/r/merge.result b/mysql-test/r/merge.result
index b8fdd24be74..5196462e97e 100644
--- a/mysql-test/r/merge.result
+++ b/mysql-test/r/merge.result
@@ -626,7 +626,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 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
-1	SIMPLE	t2	ref	PRIMARY,files	PRIMARY	35	const,const	1	Using where
+1	SIMPLE	t2	const	PRIMARY,files	PRIMARY	35	const,const	1	
 DROP TABLE t2, t1;
 create table t1 (x int, y int, index xy(x, y));
 create table t2 (x int, y int, index xy(x, y));
diff --git a/mysql-test/r/select.result b/mysql-test/r/select.result
index 9c35e1963e6..547b4c71895 100644
--- a/mysql-test/r/select.result
+++ b/mysql-test/r/select.result
@@ -3552,3 +3552,13 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	range	PRIMARY	PRIMARY	12	NULL	2	Using where
 1	SIMPLE	t2	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));
+CREATE TABLE t2 (a int, b varchar(20) NOT NULL,
+PRIMARY KEY (a), UNIQUE KEY (b));
+INSERT INTO t1 VALUES (1,'a'),(2,'b'),(3,'c');
+INSERT INTO t2 VALUES (1,'a'),(2,'b'),(3,'c');
+EXPLAIN SELECT t1.a FROM t1 LEFT JOIN t2 ON t2.b=t1.b WHERE t1.a=3;
+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	const	b	b	22	const	1	Using index
+DROP TABLE t1,t2;
diff --git a/mysql-test/r/subselect.result b/mysql-test/r/subselect.result
index 6bf85979002..abe840e96d9 100644
--- a/mysql-test/r/subselect.result
+++ b/mysql-test/r/subselect.result
@@ -363,12 +363,12 @@ INSERT INTO t8 (pseudo,email) VALUES ('joce1','test1');
 INSERT INTO t8 (pseudo,email) VALUES ('2joce1','2test1');
 EXPLAIN EXTENDED SELECT pseudo,(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce')) FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce');
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	PRIMARY	t8	ref	PRIMARY	PRIMARY	37	const	1	Using where; Using index
-4	SUBQUERY	t8	ref	PRIMARY	PRIMARY	37		1	Using where; Using index
-2	SUBQUERY	t8	ref	PRIMARY	PRIMARY	37	const	1	Using where
-3	SUBQUERY	t8	ref	PRIMARY	PRIMARY	37		1	Using where; Using index
+1	PRIMARY	t8	const	PRIMARY	PRIMARY	37	const	1	Using index
+4	SUBQUERY	t8	const	PRIMARY	PRIMARY	37		1	Using index
+2	SUBQUERY	t8	const	PRIMARY	PRIMARY	37	const	1	
+3	SUBQUERY	t8	const	PRIMARY	PRIMARY	37		1	Using index
 Warnings:
-Note	1003	select `test`.`t8`.`pseudo` AS `pseudo`,(select `test`.`t8`.`email` AS `email` from `test`.`t8` where (`test`.`t8`.`pseudo` = (select `test`.`t8`.`pseudo` AS `pseudo` from `test`.`t8` where (`test`.`t8`.`pseudo` = _latin1'joce')))) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where (`test`.`t8`.`pseudo` = (select `test`.`t8`.`pseudo` AS `pseudo` from `test`.`t8` where (`test`.`t8`.`pseudo` = _latin1'joce')))
+Note	1003	select `test`.`t8`.`pseudo` AS `pseudo`,(select `test`.`t8`.`email` AS `email` from `test`.`t8` where 1) AS `(SELECT email FROM t8 WHERE pseudo=(SELECT pseudo FROM t8 WHERE pseudo='joce'))` from `test`.`t8` where 1
 SELECT pseudo FROM t8 WHERE pseudo=(SELECT pseudo,email FROM
 t8 WHERE pseudo='joce');
 ERROR 21000: Operand should contain 1 column(s)
diff --git a/mysql-test/t/select.test b/mysql-test/t/select.test
index 166b709f9b6..741cc3de6b3 100644
--- a/mysql-test/t/select.test
+++ b/mysql-test/t/select.test
@@ -3033,3 +3033,17 @@ EXPLAIN SELECT t2.*
     WHERE t2.fk IN ('a','b') AND t2.pk=t1.fk;
 
 DROP TABLE t1,t2;
+
+#
+# Bug #22367: Optimizer uses ref join type instead of eq_ref for simple 
+#               join on strings
+#
+CREATE TABLE t1 (a int, b varchar(20) NOT NULL, PRIMARY KEY(a));
+CREATE TABLE t2 (a int, b varchar(20) NOT NULL,
+                 PRIMARY KEY (a), UNIQUE KEY (b));
+INSERT INTO t1 VALUES (1,'a'),(2,'b'),(3,'c');
+INSERT INTO t2 VALUES (1,'a'),(2,'b'),(3,'c');
+
+EXPLAIN SELECT t1.a FROM t1 LEFT JOIN t2 ON t2.b=t1.b WHERE t1.a=3;
+
+DROP TABLE t1,t2;