REVOKE all privileges and delete user(244)

include/mysqld_error.h:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
mysql-test/r/grant.result:
  Test for DROP USER, REVOKE ALL PRIVILEGES, GRANT
mysql-test/t/grant.test:
  Test for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/czech/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/danish/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/dutch/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/english/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/estonian/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/french/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/german/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/greek/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/hungarian/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/italian/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/japanese/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/korean/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/norwegian-ny/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/norwegian/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/polish/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/portuguese/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/romanian/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/russian/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/serbian/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/slovak/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/spanish/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/swedish/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT
sql/share/ukrainian/errmsg.txt:
  Error messages for DROP USER, REVOKE ALL PRIVILEGES, GRANT

include/mysqld_error.h

@@ -282,4 +282,6 @@
 #define ER_WARN_DATA_TRUNCATED 1263
 #define ER_WARN_USING_OTHER_HANDLER 1264
 #define ER_CANT_AGGREGATE_COLLATIONS 1265
+#define ER_DROP_USER 1266
+#define ER_REVOKE_GRANTS 1267
 #define ER_ERROR_MESSAGES 266

mysql-test/r/grant.result

@@ -1,3 +1,5 @@
+drop table if exists t1;
+create table t1 (a int);
 delete from mysql.user where user='mysqltest_1';
 delete from mysql.db where user='mysqltest_1';
 flush privileges;
@@ -69,3 +71,36 @@ show grants for user@localhost;
 Grants for user@localhost
 GRANT USAGE ON *.* TO 'user'@'localhost'
 GRANT USAGE ON `test`.* TO 'user'@'localhost' WITH GRANT OPTION
+grant ALL PRIVILEGES on *.* to drop_user2@localhost with GRANT OPTION;
+show grants for drop_user2@localhost;
+Grants for drop_user2@localhost
+GRANT ALL PRIVILEGES ON *.* TO 'drop_user2'@'localhost' WITH GRANT OPTION
+revoke all privileges, grant from drop_user2@localhost;
+drop user drop_user2@localhost;
+grant ALL PRIVILEGES on *.* to drop_user@localhost with GRANT OPTION;
+grant ALL PRIVILEGES on test.* to drop_user@localhost with GRANT OPTION;
+grant select(a) on test.t1 to drop_user@localhost;
+show grants for drop_user@localhost;
+Grants for drop_user@localhost
+GRANT ALL PRIVILEGES ON *.* TO 'drop_user'@'localhost' WITH GRANT OPTION
+GRANT ALL PRIVILEGES ON `test`.* TO 'drop_user'@'localhost' WITH GRANT OPTION
+GRANT SELECT (a) ON `test`.`t1` TO 'drop_user'@'localhost'
+revoke all privileges, grant from drop_user@localhost;
+show grants for drop_user@localhost;
+Grants for drop_user@localhost
+GRANT USAGE ON *.* TO 'drop_user'@'localhost'
+drop user drop_user@localhost;
+revoke all privileges, grant from drop_user@localhost;
+Can't revoke all privileges, grant for one or more of the requested users
+grant select(a) on test.t1 to drop_user1@localhost;
+grant select on test.t1 to drop_user2@localhost;
+grant select on test.* to drop_user3@localhost;
+grant select on *.* to drop_user4@localhost;
+drop user drop_user1@localhost, drop_user2@localhost, drop_user3@localhost,
+drop_user4@localhost;
+Can't drop one or more of the requested users
+revoke all privileges, grant from drop_user1@localhost, drop_user2@localhost,
+drop_user3@localhost, drop_user4@localhost;
+drop user drop_user1@localhost, drop_user2@localhost, drop_user3@localhost,
+drop_user4@localhost;
+drop table t1;

mysql-test/t/grant.test

@@ -1,3 +1,9 @@
+--disable_warnings
+drop table if exists t1;
+--enable_warnings
+
+create table t1 (a int);
+
 #
 # Test that SSL options works properly
 #
@@ -42,3 +48,35 @@ flush privileges;
 grant usage on test.* to user@localhost with grant option;
 show grants for user@localhost;
 
+#
+# Test for 'drop user', 'revoke privileges, grant' 
+#
+
+grant ALL PRIVILEGES on *.* to drop_user2@localhost with GRANT OPTION;
+show grants for drop_user2@localhost;
+revoke all privileges, grant from drop_user2@localhost;
+drop user drop_user2@localhost;
+
+grant ALL PRIVILEGES on *.* to drop_user@localhost with GRANT OPTION;
+grant ALL PRIVILEGES on test.* to drop_user@localhost with GRANT OPTION;
+grant select(a) on test.t1 to drop_user@localhost;
+show grants for drop_user@localhost;
+revoke all privileges, grant from drop_user@localhost;
+show grants for drop_user@localhost;
+drop user drop_user@localhost;
+--error 1267
+revoke all privileges, grant from drop_user@localhost;
+
+grant select(a) on test.t1 to drop_user1@localhost;
+grant select on test.t1 to drop_user2@localhost;
+grant select on test.* to drop_user3@localhost;
+grant select on *.* to drop_user4@localhost;
+--error 1266
+drop user drop_user1@localhost, drop_user2@localhost, drop_user3@localhost,
+drop_user4@localhost;
+revoke all privileges, grant from drop_user1@localhost, drop_user2@localhost,
+drop_user3@localhost, drop_user4@localhost;
+drop user drop_user1@localhost, drop_user2@localhost, drop_user3@localhost,
+drop_user4@localhost;
+
+drop table t1;

sql/lex.h

@@ -396,6 +396,7 @@ static SYMBOL symbols[] = {
   { "UNSIGNED",		SYM(UNSIGNED),0,0},
   { "USE",		SYM(USE_SYM),0,0},
   { "USE_FRM",		SYM(USE_FRM),0,0},
+  { "USER",		SYM(USER),0,0},
   { "USING",		SYM(USING),0,0},
   { "UPDATE",		SYM(UPDATE_SYM),0,0},
   { "USAGE",		SYM(USAGE),0,0},
@@ -632,7 +633,6 @@ static SYMBOL sql_functions[] = {
   { "UNIQUE_USERS",	SYM(UNIQUE_USERS),0,0},
   { "UNIX_TIMESTAMP",	SYM(UNIX_TIMESTAMP),0,0},
   { "UPPER",		SYM(FUNC_ARG1),0,CREATE_FUNC(create_func_ucase)},
-  { "USER",		SYM(USER),0,0},
   { "VARIANCE",		SYM(VARIANCE_SYM),0,0},
   { "VERSION",		SYM(FUNC_ARG0),0,CREATE_FUNC(create_func_version)},
   { "WEEK",		SYM(WEEK_SYM),0,0},

sql/share/czech/errmsg.txt

@@ -271,3 +271,5 @@ v/*
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/danish/errmsg.txt

@@ -265,3 +265,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/dutch/errmsg.txt

@@ -273,3 +273,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/english/errmsg.txt

@@ -267,3 +267,5 @@
 "Data truncated for column '%s' at row %ld"
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/estonian/errmsg.txt

@@ -267,3 +267,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/french/errmsg.txt

@@ -262,3 +262,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/german/errmsg.txt

@@ -271,3 +271,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/greek/errmsg.txt

@@ -262,3 +262,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/hungarian/errmsg.txt

@@ -264,3 +264,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/italian/errmsg.txt

@@ -262,3 +262,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/japanese/errmsg.txt

@@ -264,3 +264,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/korean/errmsg.txt

@@ -262,3 +262,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/norwegian-ny/errmsg.txt

@@ -264,3 +264,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/norwegian/errmsg.txt

@@ -264,3 +264,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/polish/errmsg.txt

@@ -266,3 +266,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/portuguese/errmsg.txt

@@ -262,3 +262,5 @@
 "%d linha(s) foi(foram) cortada(s) por group_concat()",
 "Usando engine de armazenamento %s para tabela '%s'",
 "Combina<6E><61>o ilegal de collations (%s,%s) e (%s,%s) para opera<72><61>o '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/romanian/errmsg.txt

@@ -266,3 +266,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/russian/errmsg.txt

@@ -264,3 +264,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/serbian/errmsg.txt

@@ -258,3 +258,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/slovak/errmsg.txt

@@ -270,3 +270,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/spanish/errmsg.txt

@@ -263,3 +263,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/swedish/errmsg.txt

@@ -262,3 +262,5 @@
 "%d rad(er) kapades av group_concat()",
 "Anv<6E>nder handler %s f<>r tabell '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/share/ukrainian/errmsg.txt

@@ -267,3 +267,5 @@
 "%d line(s) was(were) cut by group_concat()",
 "Using storage engine %s for table '%s'",
 "Illegal mix of collations (%s,%s) and (%s,%s) for operation '%s'",
+"Can't drop one or more of the requested users"
+"Can't revoke all privileges, grant for one or more of the requested users"

sql/sql_acl.cc

@@ -2179,11 +2179,6 @@ int mysql_table_grant(THD *thd, TABLE_LIST *table_list,
   {
     int error;
     GRANT_TABLE *grant_table;
-    if (!Str->host.str)
-    {
-      Str->host.str=(char*) "%";
-      Str->host.length=1;
-    }
     if (Str->host.length > HOSTNAME_LENGTH ||
 	Str->user.length > USERNAME_LENGTH)
     {
@@ -2350,11 +2345,6 @@ int mysql_grant (THD *thd, const char *db, List <LEX_USER> &list,
   int result=0;
   while ((Str = str_list++))
   {
-    if (!Str->host.str)
-    {
-      Str->host.str=(char*) "%";
-      Str->host.length=1;
-    }
     if (Str->host.length > HOSTNAME_LENGTH ||
 	Str->user.length > USERNAME_LENGTH)
     {
@@ -2855,11 +2845,6 @@ int mysql_show_grants(THD *thd,LEX_USER *lex_user)
     send_error(thd, ER_UNKNOWN_COM_ERROR);
     DBUG_RETURN(-1);
   }
-  if (!lex_user->host.str)
-  {
-    lex_user->host.str=(char*) "%";
-    lex_user->host.length=1;
-  }
   if (lex_user->host.length > HOSTNAME_LENGTH ||
       lex_user->user.length > USERNAME_LENGTH)
   {
@@ -3202,6 +3187,279 @@ void get_mqh(const char *user, const char *host, USER_CONN *uc)
     bzero((char*) &uc->user_resources, sizeof(uc->user_resources));
 }
 
+int open_grant_tables(THD *thd, TABLE_LIST *tables)
+{
+  DBUG_ENTER("open_grant_tables");
+
+  if (!initialized)
+  {
+    send_error(thd, ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES));
+    DBUG_RETURN(-1);
+  }
+
+  bzero((char*) tables, 4*sizeof(*tables));
+  tables->alias= tables->real_name= (char*) "user";
+  (tables+1)->alias= (tables+1)->real_name= (char*) "db";
+  (tables+2)->alias= (tables+2)->real_name= (char*) "tables_priv";
+  (tables+3)->alias= (tables+3)->real_name= (char*) "columns_priv";
+  tables->next= tables+1;
+  (tables+1)->next= tables+2;
+  (tables+2)->next= tables+3;
+  (tables+3)->next= 0;
+  tables->lock_type= (tables+1)->lock_type=
+    (tables+2)->lock_type= (tables+3)->lock_type= TL_WRITE;
+  tables->db= (tables+1)->db= (tables+2)->db= (tables+3)->db=(char*) "mysql";
+
+#ifdef HAVE_REPLICATION
+  /*
+    GRANT and REVOKE are applied the slave in/exclusion rules as they are
+    some kind of updates to the mysql.% tables.
+  */
+  if (thd->slave_thread && table_rules_on && !tables_ok(0, tables))
+    DBUG_RETURN(1);
+#endif
+
+  if (open_and_lock_tables(thd, tables))
+  {						// This should never happen
+    close_thread_tables(thd);
+    DBUG_RETURN(-1);
+  }
+
+  DBUG_RETURN(0);
+}
+
+ACL_USER *check_acl_user(LEX_USER *user_name,
+			 uint *acl_user_idx)
+{
+  ACL_USER *acl_user= 0;
+  uint counter;
+
+  for (counter= 0 ; counter < acl_users.elements ; counter++)
+  {
+    const char *user,*host;
+    acl_user= dynamic_element(&acl_users, counter, ACL_USER*);
+    if (!(user=acl_user->user))
+      user="";
+    if (!(host=acl_user->host.hostname))
+      host="%";
+    if (!strcmp(user_name->user.str,user) &&
+	!my_strcasecmp(system_charset_info, user_name->host.str, host))
+      break;
+  }
+  if (counter == acl_users.elements)
+    return 0;
+
+  *acl_user_idx= counter;
+  return acl_user;    
+}
+
+int mysql_drop_user(THD *thd, List <LEX_USER> &list)
+{
+  uint counter, user_id;
+  int result;
+  ACL_USER *acl_user;
+  ACL_DB *acl_db;
+  TABLE_LIST tables[4];
+
+  DBUG_ENTER("mysql_drop_user");
+
+  if ((result= open_grant_tables(thd, tables)))
+    DBUG_RETURN(result == 1 ? 0 : -1);
+
+  rw_wrlock(&LOCK_grant);
+  VOID(pthread_mutex_lock(&acl_cache->lock));
+
+  LEX_USER *user_name;
+  List_iterator <LEX_USER> user_list(list);
+  while ((user_name=user_list++))
+  {
+    if (!(acl_user= check_acl_user(user_name, &counter)))
+    {
+      sql_print_error("DROP USER: Can't drop user: '%s'@'%s'",
+		      user_name->user.str,
+		      user_name->host.str);
+      result= -1;
+      continue;
+    }
+    if ((acl_user->access & ~0))
+    {
+      sql_print_error("DROP USER: Can't drop user: '%s'@'%s'",
+		      user_name->user.str,
+		      user_name->host.str);
+      result= -1;
+      continue;
+    }
+    user_id= counter;
+
+    for (counter= 0 ; counter < acl_dbs.elements ; counter++)
+    {
+      const char *user,*host;
+      acl_db=dynamic_element(&acl_dbs,counter,ACL_DB*);
+      if (!(user= acl_db->user))
+	user="";
+      if (!(host= acl_db->host.hostname))
+	host="";
+
+      if (!strcmp(user_name->user.str,user) &&
+	  !my_strcasecmp(system_charset_info, user_name->host.str, host))
+	break;
+    }
+    if (counter != acl_dbs.elements)
+    {
+      sql_print_error("DROP USER: Can't drop user: '%s'@'%s'",
+		      user_name->user.str,
+		      user_name->host.str);
+      result= -1;
+      continue;
+    }
+
+    for (counter= 0 ; counter < column_priv_hash.records ; counter++)
+    {
+      const char *user,*host;
+      GRANT_TABLE *grant_table= (GRANT_TABLE*) hash_element(&column_priv_hash,
+							    counter);
+      if (!(user=grant_table->user))
+	user="";
+      if (!(host=grant_table->host))
+	host="";
+
+      if (!strcmp(user_name->user.str,user) &&
+	  !my_strcasecmp(system_charset_info, user_name->host.str, host))
+	break;
+    }
+    if (counter != column_priv_hash.records)
+    {
+      sql_print_error("DROP USER: Can't drop user: '%s'@'%s'",
+		      user_name->user.str,
+		      user_name->host.str);
+      result= -1;
+      continue;
+    }
+
+    tables[0].table->field[0]->store(user_name->host.str,(uint) 
+				     user_name->host.length, system_charset_info);
+    tables[0].table->field[1]->store(user_name->user.str,(uint) 
+				     user_name->user.length, system_charset_info);
+    if (!tables[0].table->file->index_read_idx(tables[0].table->record[0],0,
+					       (byte*) tables[0].table->field[0]->ptr,0,
+					       HA_READ_KEY_EXACT))
+    {
+      int error;
+      if ((error = tables[0].table->file->delete_row(tables[0].table->record[0])))
+      {
+	tables[0].table->file->print_error(error, MYF(0));
+	tables[0].table->file->index_end();
+	DBUG_RETURN(-1);
+      }
+      delete_dynamic_element(&acl_users, user_id);
+    }
+    tables[0].table->file->index_end();
+  }
+err:
+  VOID(pthread_mutex_unlock(&acl_cache->lock));
+  rw_unlock(&LOCK_grant);
+  close_thread_tables(thd);
+  if (result)
+    my_error(ER_DROP_USER, MYF(0));
+  DBUG_RETURN(result);
+}
+
+int mysql_revoke_all(THD *thd,  List <LEX_USER> &list)
+{
+  uint counter;
+  int result;
+  ACL_USER *acl_user; ACL_DB *acl_db;
+  TABLE_LIST tables[4];
+  DBUG_ENTER("mysql_revoke_all");
+
+  if ((result= open_grant_tables(thd, tables)))
+    DBUG_RETURN(result == 1 ? 0 : -1);
+
+  rw_wrlock(&LOCK_grant);
+  VOID(pthread_mutex_lock(&acl_cache->lock));
+
+  LEX_USER *lex_user;
+  List_iterator <LEX_USER> user_list(list);
+  while ((lex_user=user_list++))
+  {
+    if (!(acl_user= check_acl_user(lex_user, &counter)))
+    {
+      sql_print_error("REVOKE ALL PRIVILEGES, GRANT: User '%s'@'%s' not exists",
+		      lex_user->user.str,
+		      lex_user->host.str);
+      result= -1;
+      continue;
+    }
+    
+    if (replace_user_table(thd, tables[0].table,
+			   *lex_user, ~0, 1, 0))
+    {
+      result= -1;
+      continue;
+    }
+
+    /* Remove db access privileges */
+    for (counter= 0 ; counter < acl_dbs.elements ; counter++)
+    {
+      const char *user,*host;
+
+      acl_db=dynamic_element(&acl_dbs,counter,ACL_DB*);
+      if (!(user=acl_db->user))
+	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))
+      {
+	if (replace_db_table(tables[1].table, acl_db->db, *lex_user, ~0, 1))
+	  result= -1;
+      }
+    }
+
+    /* Remove column access */
+    for (counter= 0 ; counter < column_priv_hash.records ; counter++)
+    {
+      const char *user,*host;
+      GRANT_TABLE *grant_table= (GRANT_TABLE*) hash_element(&column_priv_hash,
+							    counter);
+      if (!(user=grant_table->user))
+	user="";
+      if (!(host=grant_table->host))
+	host="";
+
+      if (!strcmp(lex_user->user.str,user) &&
+	  !my_strcasecmp(system_charset_info, lex_user->host.str, host))
+      {
+	if (replace_table_table(thd,grant_table,tables[2].table,*lex_user,
+				grant_table->db,
+				grant_table->tname,
+				~0, 0, 1))
+	{
+	  result= -1;
+	  continue;
+	}
+	if (grant_table->cols)
+	{
+	  List<LEX_COLUMN> columns;
+	  if (replace_column_table(grant_table,tables[3].table, *lex_user,
+				   columns,
+				   grant_table->db,
+				   grant_table->tname,
+				   ~0, 1))
+	    result= -1;
+	}
+      }
+    }
+  }
+
+  VOID(pthread_mutex_unlock(&acl_cache->lock));
+  rw_unlock(&LOCK_grant);
+  close_thread_tables(thd);
+  if (result)
+    my_error(ER_REVOKE_GRANTS, MYF(0));
+  DBUG_RETURN(result);
+}
 
 
 /*****************************************************************************

sql/sql_acl.h

@@ -163,3 +163,5 @@ ulong get_column_grant(THD *thd, TABLE_LIST *table, Field *field);
 int mysql_show_grants(THD *thd, LEX_USER *user);
 void get_privilege_desc(char *to, uint max_length, ulong access);
 void get_mqh(const char *user, const char *host, USER_CONN *uc);
+int mysql_drop_user(THD *thd, List <LEX_USER> &list);
+int mysql_revoke_all(THD *thd, List <LEX_USER> &list);

sql/sql_lex.h

@@ -71,7 +71,7 @@ enum enum_sql_command {
   SQLCOM_SHOW_BINLOG_EVENTS, SQLCOM_SHOW_NEW_MASTER, SQLCOM_DO,
   SQLCOM_SHOW_WARNS, SQLCOM_EMPTY_QUERY, SQLCOM_SHOW_ERRORS,
   SQLCOM_SHOW_COLUMN_TYPES, SQLCOM_SHOW_TABLE_TYPES, SQLCOM_SHOW_PRIVILEGES,
-  SQLCOM_HELP,
+  SQLCOM_HELP, SQLCOM_DROP_USER, SQLCOM_REVOKE_ALL,
 
   /* This should be the last !!! */
   SQLCOM_END

sql/sql_parse.cc

@@ -2897,6 +2897,38 @@ mysql_execute_command(THD *thd)
     res= -1;
 #endif
     break;
+  case SQLCOM_DROP_USER:
+  {
+    if (check_access(thd, GRANT_ACL,"mysql",0,1))
+      break;
+    if (!(res= mysql_drop_user(thd, lex->users_list)))
+    {
+      mysql_update_log.write(thd, thd->query, thd->query_length);
+      if (mysql_bin_log.is_open())
+      {
+	Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
+	mysql_bin_log.write(&qinfo);
+      }
+      send_ok(thd);
+    }
+    break;
+  }
+  case SQLCOM_REVOKE_ALL:
+  {
+    if (check_access(thd, GRANT_ACL ,"mysql",0,1))
+      break;
+    if (!(res = mysql_revoke_all(thd, lex->users_list)))
+    {
+      mysql_update_log.write(thd, thd->query, thd->query_length);
+      if (mysql_bin_log.is_open())
+      {
+	Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
+	mysql_bin_log.write(&qinfo);
+      }
+      send_ok(thd);
+    }
+    break;
+  }
   case SQLCOM_REVOKE:
   case SQLCOM_GRANT:
   {

sql/sql_yacc.yy

@@ -3215,7 +3215,7 @@ do:	DO_SYM
 	;
 
 /*
-  Drop : delete tables or index
+  Drop : delete tables or index or user
 */
 
 drop:
@@ -3249,7 +3249,16 @@ drop:
 	    LEX *lex=Lex;
 	    lex->sql_command = SQLCOM_DROP_FUNCTION;
 	    lex->udf.name = $3;
-	  };
+	  }
+	| DROP USER
+	  {
+	    LEX *lex=Lex;
+	    lex->sql_command = SQLCOM_DROP_USER;
+	    lex->users_list.empty();
+	  } 
+	  user_list
+	  {}
+	  ;
 
 
 table_list:
@@ -4177,7 +4186,9 @@ user:
 	  THD *thd= YYTHD;
 	  if (!($$=(LEX_USER*) thd->alloc(sizeof(st_lex_user))))
 	    YYABORT;
-	  $$->user = $1; $$->host.str=NullS;
+	  $$->user = $1;
+	  $$->host.str= (char *) "%";
+	  $$->host.length= 1;
 	}
 	| ident_or_text '@' ident_or_text
 	  {
@@ -4361,6 +4372,7 @@ keyword:
 	| UDF_SYM		{}
 	| UNCOMMITTED_SYM	{}
 	| UNICODE_SYM		{}
+	| USER			{}
 	| USE_FRM		{}
 	| VARIABLES		{}
 	| VALUE_SYM		{}
@@ -4632,8 +4644,18 @@ revoke:
 	  lex->ssl_cipher= lex->x509_subject= lex->x509_issuer= 0;
 	  bzero((char*) &lex->mqh, sizeof(lex->mqh));
 	}
+	revoke_command
+	{}
+        ;
+
+revoke_command:
 	grant_privileges ON opt_table FROM user_list
 	{}
+	|
+	ALL PRIVILEGES ',' GRANT FROM user_list
+	{
+	  Lex->sql_command = SQLCOM_REVOKE_ALL;
+	}
 	;
 
 grant: