Bug #12917164 DROP USER CAN'T DROP USERS WITH LEGACY

    UPPER CASE HOST NAME ANYMORE
Merging from mysql-5.1 to mysql-5.5

scripts/mysql_system_tables_data.sql

@@ -24,8 +24,7 @@
 -- Get the hostname, if the hostname has any wildcard character like "_" or "%" 
 -- add escape character in front of wildcard character to convert "_" or "%" to
 -- a plain character
-SET @get_hostname= @@hostname;
-SELECT REPLACE((SELECT REPLACE(@get_hostname,'_','\_')),'%','\%') INTO @current_hostname;
+SELECT LOWER( REPLACE((SELECT REPLACE(@@hostname,'_','\_')),'%','\%') )INTO @current_hostname;
 
 
 -- Fill "db" table with default grants for anyone to
@@ -41,11 +40,11 @@ DROP TABLE tmp_db;
 -- from local machine if "user" table didn't exist before
 CREATE TEMPORARY TABLE tmp_user LIKE user;
 INSERT INTO tmp_user VALUES ('localhost','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','','','','',0,0,0,0,'','');
-REPLACE INTO tmp_user SELECT @current_hostname,'root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','','','','',0,0,0,0,'','' FROM dual WHERE LOWER( @current_hostname) != 'localhost';
+REPLACE INTO tmp_user SELECT @current_hostname,'root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','','','','',0,0,0,0,'','' FROM dual WHERE @current_hostname != 'localhost';
 REPLACE INTO tmp_user VALUES ('127.0.0.1','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','','','','',0,0,0,0,'','');
 REPLACE INTO tmp_user VALUES ('::1','root','','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','Y','','','','',0,0,0,0,'','');
 INSERT INTO tmp_user (host,user) VALUES ('localhost','');
-INSERT INTO tmp_user (host,user) SELECT @current_hostname,'' FROM dual WHERE LOWER(@current_hostname ) != 'localhost';
+INSERT INTO tmp_user (host,user) SELECT @current_hostname,'' FROM dual WHERE @current_hostname != 'localhost';
 INSERT INTO user SELECT * FROM tmp_user WHERE @had_user_table=0;
 DROP TABLE tmp_user;
 

scripts/mysql_system_tables_fix.sql

@@ -652,6 +652,8 @@ INSERT INTO tmp_proxies_priv VALUES ('localhost', 'root', '', '', TRUE, '', now(
 INSERT INTO proxies_priv SELECT * FROM tmp_proxies_priv WHERE @had_proxies_priv_table=0;
 DROP TABLE tmp_proxies_priv;
 
+# Convering the host name to lower case for existing users
+UPDATE user SET host=LOWER( host ) WHERE LOWER( host ) <> host;
 
 # Activate the new, possible modified privilege tables
 # This should not be needed, but gives us some extra testing that the above