--- ../mysql-5.0.bk-orig/sql/sql_acl.cc	Fri Mar 23 11:12:09 2007
+++ sql/sql_acl.cc	Wed May 30 21:46:06 2007
@@ -1129,11 +1129,11 @@
 	acl_db->user &&
 	!strcmp(user,acl_db->user))
     {
       if (!acl_db->host.hostname && !host[0] ||
 	  acl_db->host.hostname &&
-	  !my_strcasecmp(system_charset_info, host, acl_db->host.hostname))
+          !strcmp(host, acl_db->host.hostname))
       {
 	if (!acl_db->db && !db[0] ||
 	    acl_db->db && !strcmp(db,acl_db->db))
 	{
 	  if (privileges)
@@ -5537,11 +5537,11 @@
 	  user= "";
 	if (!(host=acl_db->host.hostname))
 	  host= "";
 
 	if (!strcmp(lex_user->user.str,user) &&
-	    !my_strcasecmp(system_charset_info, lex_user->host.str, host))
+            !strcmp(lex_user->host.str, host))
 	{
 	  if (!replace_db_table(tables[1].table, acl_db->db, *lex_user, ~(ulong)0, 1))
 	  {
 	    /*
 	      Don't increment counter as replace_db_table deleted the
@@ -5568,11 +5568,11 @@
 	  user= "";
 	if (!(host=grant_table->host.hostname))
 	  host= "";
 
 	if (!strcmp(lex_user->user.str,user) &&
-	    !my_strcasecmp(system_charset_info, lex_user->host.str, host))
+            !strcmp(lex_user->host.str, host))
 	{
 	  if (replace_table_table(thd,grant_table,tables[2].table,*lex_user,
 				  grant_table->db,
 				  grant_table->tname,
 				  ~(ulong)0, 0, 1))
@@ -5614,11 +5614,11 @@
 	  user= "";
 	if (!(host=grant_proc->host.hostname))
 	  host= "";
 
 	if (!strcmp(lex_user->user.str,user) &&
-	    !my_strcasecmp(system_charset_info, lex_user->host.str, host))
+            !strcmp(lex_user->host.str, host))
 	{
 	  if (!replace_routine_table(thd,grant_proc,tables[4].table,*lex_user,
 				  grant_proc->db,
 				  grant_proc->tname,
                                   is_proc,
--- ../mysql-5.0.bk-orig/mysql-test/t/grant3.test	Mon May 21 07:50:00 2007
+++ mysql-test/t/grant3.test	Wed May 30 21:49:39 2007
@@ -32,5 +32,106 @@
 delete from mysql.user where user like 'mysqltest\_%';
 delete from mysql.db where user like 'mysqltest\_%';
 delete from mysql.tables_priv where user like 'mysqltest\_%';
 delete from mysql.columns_priv where user like 'mysqltest\_%';
 flush privileges;
+
+#
+# Bug: #19828 Case sensitivity in Grant/Revoke
+#
+
+grant select on test.* to CUser@localhost;
+grant select on test.* to CUser@LOCALHOST;
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser' order by 1,2;
+
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'LOCALHOST';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser' order by 1,2;
+
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'localhost';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser' order by 1,2;
+
+DROP USER CUser@localhost;
+DROP USER CUser@LOCALHOST;
+
+#### table grants
+create table t1 (a int);
+grant select on test.t1 to CUser@localhost;
+grant select on test.t1 to CUser@LOCALHOST;
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'LOCALHOST';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'localhost';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+
+DROP USER CUser@localhost;
+DROP USER CUser@LOCALHOST;
+
+### column grants
+
+grant select(a) on test.t1 to CUser@localhost;
+grant select(a) on test.t1 to CUser@LOCALHOST;
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'LOCALHOST';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'localhost';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+
+DROP USER CUser@localhost;
+DROP USER CUser@LOCALHOST;
+
+drop table t1;
+
+# revoke on a specific DB only
+
+grant select on test.* to CUser2@localhost;
+grant select on test.* to CUser2@LOCALHOST;
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser2' order by 1,2;
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser2' order by 1,2;
+
+REVOKE SELECT ON test.* FROM 'CUser2'@'LOCALHOST';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser2' order by 1,2;
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser2' order by 1,2;
+
+REVOKE SELECT ON test.* FROM 'CUser2'@'localhost';
+flush privileges;
+
+SELECT user, host FROM mysql.user where user = 'CUser2' order by 1,2;
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser2' order by 1,2;
+
+DROP USER CUser2@localhost;
+DROP USER CUser2@LOCALHOST;
+
--- ../mysql-5.0.bk-orig/mysql-test/r/grant3.result	Mon May 21 07:50:01 2007
+++ mysql-test/r/grant3.result	Wed May 30 21:49:42 2007
@@ -14,5 +14,127 @@
 delete from mysql.user where user like 'mysqltest\_%';
 delete from mysql.db where user like 'mysqltest\_%';
 delete from mysql.tables_priv where user like 'mysqltest\_%';
 delete from mysql.columns_priv where user like 'mysqltest\_%';
 flush privileges;
+grant select on test.* to CUser@localhost;
+grant select on test.* to CUser@LOCALHOST;
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser' order by 1,2;
+user	host	db	select_priv
+CUser	LOCALHOST	test	Y
+CUser	localhost	test	Y
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'LOCALHOST';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser' order by 1,2;
+user	host	db	select_priv
+CUser	localhost	test	Y
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'localhost';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser' order by 1,2;
+user	host	db	select_priv
+DROP USER CUser@localhost;
+DROP USER CUser@LOCALHOST;
+create table t1 (a int);
+grant select on test.t1 to CUser@localhost;
+grant select on test.t1 to CUser@LOCALHOST;
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+user	host	db	Table_name	Table_priv	Column_priv
+CUser	LOCALHOST	test	t1	Select	
+CUser	localhost	test	t1	Select	
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'LOCALHOST';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+user	host	db	Table_name	Table_priv	Column_priv
+CUser	localhost	test	t1	Select	
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'localhost';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+user	host	db	Table_name	Table_priv	Column_priv
+DROP USER CUser@localhost;
+DROP USER CUser@LOCALHOST;
+grant select(a) on test.t1 to CUser@localhost;
+grant select(a) on test.t1 to CUser@LOCALHOST;
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+user	host	db	Table_name	Table_priv	Column_priv
+CUser	LOCALHOST	test	t1		Select
+CUser	localhost	test	t1		Select
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'LOCALHOST';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+user	host	db	Table_name	Table_priv	Column_priv
+CUser	localhost	test	t1		Select
+REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'CUser'@'localhost';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser' order by 1,2;
+user	host
+CUser	LOCALHOST
+CUser	localhost
+SELECT user, host, db, Table_name, Table_priv, Column_priv FROM mysql.tables_priv where user = 'CUser' order by 1,2;
+user	host	db	Table_name	Table_priv	Column_priv
+DROP USER CUser@localhost;
+DROP USER CUser@LOCALHOST;
+drop table t1;
+grant select on test.* to CUser2@localhost;
+grant select on test.* to CUser2@LOCALHOST;
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser2' order by 1,2;
+user	host
+CUser2	LOCALHOST
+CUser2	localhost
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser2' order by 1,2;
+user	host	db	select_priv
+CUser2	LOCALHOST	test	Y
+CUser2	localhost	test	Y
+REVOKE SELECT ON test.* FROM 'CUser2'@'LOCALHOST';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser2' order by 1,2;
+user	host
+CUser2	LOCALHOST
+CUser2	localhost
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser2' order by 1,2;
+user	host	db	select_priv
+CUser2	localhost	test	Y
+REVOKE SELECT ON test.* FROM 'CUser2'@'localhost';
+flush privileges;
+SELECT user, host FROM mysql.user where user = 'CUser2' order by 1,2;
+user	host
+CUser2	LOCALHOST
+CUser2	localhost
+SELECT user, host, db, select_priv FROM mysql.db where user = 'CUser2' order by 1,2;
+user	host	db	select_priv
+DROP USER CUser2@localhost;
+DROP USER CUser2@LOCALHOST;