Merge a change from MySQL AB:

ChangeSet
  2007/02/14 22:06:41-08:00 igor@olga.mysql.com 
  Fixed bug #25971: indexes on text columns were ignored when ref accesses
  were evaluated.
  According to the new rules for string comparison partial indexes on text
  columns can be used in the same cases when partial indexes on varchar
  columns can be used.

mysql-test/r/innodb.result
  2007/02/14 22:06:39-08:00 igor@olga.mysql.com +1 -1
  Adjusted results after the fix for bug #25971.

mysql-test/innodb.result

@@ -1984,7 +1984,7 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ref	c	c	11	const	#	Using where; Using index
 explain select count(*) from t1 where t='a  ';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t1	range	t	t	13	NULL	#	Using where
+1	SIMPLE	t1	ref	t	t	13	const	#	Using where
 explain select count(*) from t1 where v like 'a%';
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	range	v	v	13	NULL	#	Using where; Using index