MDEV-7288 USER/ROLE: CREATE OR REPLACE, CREATE IF NOT EXISTS, DROP IF EXISTS

mysql-test/r/create_drop_binlog.result

@@ -181,3 +181,65 @@ Log_name	Pos	Event_type	Server_id	End_log_pos	Info
 #	#	Gtid	1	#	GTID #-#-#
 #	#	Query	1	#	use `test`; DROP VIEW IF EXISTS v1
 RESET MASTER;
+CREATE OR REPLACE ROLE r1;
+CREATE OR REPLACE ROLE r1;
+DROP ROLE r1;
+CREATE ROLE IF NOT EXISTS r1;
+CREATE ROLE IF NOT EXISTS r1;
+Warnings:
+Note	1974	Can't create role 'r1'; it already exists
+DROP ROLE IF EXISTS r1;
+DROP ROLE IF EXISTS r1;
+Warnings:
+Note	1975	Can't drop role 'r1'; it doesn't exist
+SHOW BINLOG EVENTS;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+#	#	Format_desc	1	#	VER
+#	#	Gtid_list	1	#	[]
+#	#	Binlog_checkpoint	1	#	master-bin.000001
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; CREATE OR REPLACE ROLE r1
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; CREATE OR REPLACE ROLE r1
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; DROP ROLE r1
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; CREATE ROLE IF NOT EXISTS r1
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; CREATE ROLE IF NOT EXISTS r1
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; DROP ROLE IF EXISTS r1
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; DROP ROLE IF EXISTS r1
+RESET MASTER;
+CREATE OR REPLACE USER u1@localhost;
+CREATE OR REPLACE USER u1@localhost;
+DROP USER u1@localhost;
+CREATE USER IF NOT EXISTS u1@localhost;
+CREATE USER IF NOT EXISTS u1@localhost;
+Warnings:
+Note	1972	Can't create user 'u1'@'localhost'; it already exists
+DROP USER IF EXISTS u1@localhost;
+DROP USER IF EXISTS u1@localhost;
+Warnings:
+Note	1973	Can't drop user 'u1'@'localhost'; it doesn't exist
+SHOW BINLOG EVENTS;
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+#	#	Format_desc	1	#	VER
+#	#	Gtid_list	1	#	[]
+#	#	Binlog_checkpoint	1	#	master-bin.000001
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; CREATE OR REPLACE USER u1@localhost
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; CREATE OR REPLACE USER u1@localhost
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; DROP USER u1@localhost
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; CREATE USER IF NOT EXISTS u1@localhost
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; CREATE USER IF NOT EXISTS u1@localhost
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; DROP USER IF EXISTS u1@localhost
+#	#	Gtid	1	#	GTID #-#-#
+#	#	Query	1	#	use `test`; DROP USER IF EXISTS u1@localhost
+RESET MASTER;

mysql-test/r/create_drop_role.result

@@ -0,0 +1,75 @@
+CREATE ROLE IF NOT EXISTS role1 WITH ADMIN user1;
+Warnings:
+Note	1449	The user specified as a definer ('user1'@'%') does not exist
+SELECT * FROM mysql.roles_mapping;
+Host	User	Role	Admin_option
+%	user1	role1	Y
+DROP ROLE role1;
+CREATE OR REPLACE ROLE role1 WITH ADMIN user2;
+Warnings:
+Note	1449	The user specified as a definer ('user2'@'%') does not exist
+SELECT * FROM mysql.roles_mapping WHERE Role='role1';
+Host	User	Role	Admin_option
+%	user2	role1	Y
+CREATE OR REPLACE ROLE role1 WITH ADMIN user3;
+Warnings:
+Note	1449	The user specified as a definer ('user3'@'%') does not exist
+SELECT * FROM mysql.roles_mapping WHERE Role='role1';
+Host	User	Role	Admin_option
+%	user3	role1	Y
+CREATE ROLE IF NOT EXISTS role1 WITH ADMIN user4;
+Warnings:
+Note	1449	The user specified as a definer ('user4'@'%') does not exist
+Note	1974	Can't create role 'role1'; it already exists
+SELECT * FROM mysql.roles_mapping WHERE Role='role1';
+Host	User	Role	Admin_option
+%	user3	role1	Y
+DROP ROLE IF EXISTS role1;
+SELECT * FROM mysql.roles_mapping WHERE Role='role1';
+Host	User	Role	Admin_option
+DROP ROLE IF EXISTS role1;
+Warnings:
+Note	1975	Can't drop role 'role1'; it doesn't exist
+CREATE ROLE role_1;
+CREATE ROLE IF NOT EXISTS role_1;
+Warnings:
+Note	1974	Can't create role 'role_1'; it already exists
+CREATE OR REPLACE ROLE role_1;
+CREATE OR REPLACE ROLE IF NOT EXISTS role_1;
+ERROR HY000: Incorrect usage of OR REPLACE and IF NOT EXISTS
+CREATE ROLE role_1;
+ERROR HY000: Operation CREATE ROLE failed for 'role_1'
+CREATE USER u1@localhost;
+REVOKE SHOW DATABASES ON *.* FROM 'u1'@'localhost';
+GRANT SHOW DATABASES ON *.* TO role_1;
+GRANT role_1 TO u1@localhost;
+SELECT CURRENT_USER;
+CURRENT_USER
+u1@localhost
+SHOW DATABASES;
+Database
+information_schema
+test
+SELECT CURRENT_ROLE;
+CURRENT_ROLE
+NULL
+SET ROLE role_1;
+SELECT CURRENT_ROLE;
+CURRENT_ROLE
+role_1
+SHOW DATABASES;
+Database
+information_schema
+mtr
+mysql
+performance_schema
+test
+SET ROLE NONE;
+# Clearing up
+DROP ROLE role_1;
+DROP ROLE IF EXISTS role_1;
+Warnings:
+Note	1975	Can't drop role 'role_1'; it doesn't exist
+DROP ROLE role_1;
+ERROR HY000: Operation DROP ROLE failed for 'role_1'
+DROP USER u1@localhost;

mysql-test/r/create_drop_user.result

@@ -0,0 +1,43 @@
+CREATE USER IF NOT EXISTS u1@localhost IDENTIFIED BY 'pw1';
+SELECT password FROM mysql.user WHERE user='u1';
+password
+*2B602296A79E0A8784ACC5C88D92E46588CCA3C3
+CREATE USER IF NOT EXISTS u1@localhost IDENTIFIED BY 'pw2';
+Warnings:
+Note	1972	Can't create user 'u1'@'localhost'; it already exists
+SELECT password FROM mysql.user WHERE user='u1';
+password
+*2B602296A79E0A8784ACC5C88D92E46588CCA3C3
+CREATE OR REPLACE USER u1@localhost IDENTIFIED BY 'pw3';
+SELECT password FROM mysql.user WHERE user='u1';
+password
+*77B4A70CEFD76DB9415F36D291E74C110D2738E0
+CREATE OR REPLACE USER IF NOT EXISTS u1@localhost IDENTIFIED BY 'pw4';
+ERROR HY000: Incorrect usage of OR REPLACE and IF NOT EXISTS
+SELECT password FROM mysql.user WHERE user='u1';
+password
+*77B4A70CEFD76DB9415F36D291E74C110D2738E0
+DROP USER IF EXISTS u1@localhost;
+DROP USER IF EXISTS u1@localhost;
+Warnings:
+Note	1973	Can't drop user 'u1'@'localhost'; it doesn't exist
+DROP USER u1@localhost;
+ERROR HY000: Operation DROP USER failed for 'u1'@'localhost'
+CREATE OR REPLACE USER u1@localhost;
+CREATE USER u1@localhost;
+ERROR HY000: Operation CREATE USER failed for 'u1'@'localhost'
+DROP USER u1@localhost;
+CREATE USER u1;
+CREATE USER u1, u2;
+ERROR HY000: Operation CREATE USER failed for 'u1'@'%'
+CREATE USER u2;
+ERROR HY000: Operation CREATE USER failed for 'u2'@'%'
+CREATE OR REPLACE USER u1 IDENTIFIED BY PASSWORD 'password', u2;
+ERROR HY000: Password hash should be a 41-digit hexadecimal number
+CREATE OR REPLACE USER u1 IDENTIFIED BY PASSWORD 'abcdefghijklmnop', u2;
+DROP USER u1;
+DROP USER IF EXISTS u1, u2;
+Warnings:
+Note	1973	Can't drop user 'u1'@'%'; it doesn't exist
+DROP USER u2;
+ERROR HY000: Operation DROP USER failed for 'u2'@'%'

mysql-test/r/create_or_replace_permission.result

@@ -35,6 +35,10 @@ CREATE OR REPLACE FUNCTION lookup RETURNS STRING SONAME "UDF_EXAMPLE_LIB";
 ERROR 42000: Access denied for user 'mysqltest_1'@'localhost' to database 'mysql'
 CREATE OR REPLACE FUNCTION hello(str char(20)) RETURNS TEXT RETURN CONCAT('Hello, ', str, '!');
 ERROR 42000: alter routine command denied to user 'mysqltest_1'@'localhost' for routine 'db1.hello'
+CREATE OR REPLACE USER u1@localhost;
+ERROR 42000: Access denied; you need (at least one of) the CREATE USER privilege(s) for this operation
+CREATE OR REPLACE ROLE developer;
+ERROR 42000: Access denied; you need (at least one of) the CREATE USER privilege(s) for this operation
 SELECT CURRENT_USER;
 CURRENT_USER
 root@localhost

mysql-test/suite/rpl/r/rpl_create_drop_role.result

@@ -0,0 +1,41 @@
+include/master-slave.inc
+[connection master]
+CREATE ROLE role_1;
+SELECT User FROM mysql.user WHERE is_role='Y' ORDER BY User;
+User
+role_1
+CREATE ROLE IF NOT EXISTS role_1;
+Warnings:
+Note	1974	Can't create role 'role_1'; it already exists
+CREATE ROLE IF NOT EXISTS role_2;
+SELECT User FROM mysql.user WHERE is_role='Y' ORDER BY User;
+User
+role_1
+role_2
+CREATE OR REPLACE ROLE IF NOT EXISTS role_3;
+ERROR HY000: Incorrect usage of OR REPLACE and IF NOT EXISTS
+CREATE OR REPLACE ROLE role_3;
+CREATE OR REPLACE ROLE role_2;
+SELECT User FROM mysql.user WHERE is_role='Y' ORDER BY User;
+User
+role_1
+role_2
+role_3
+CREATE ROLE role_2;
+ERROR HY000: Operation CREATE ROLE failed for 'role_2'
+SELECT User FROM mysql.user WHERE is_role='Y' ORDER BY User;
+User
+role_1
+role_2
+role_3
+DROP ROLE role_1;
+DROP ROLE IF EXISTS role_2;
+DROP ROLE IF EXISTS role_3;
+DROP ROLE IF EXISTS role_4;
+Warnings:
+Note	1975	Can't drop role 'role_4'; it doesn't exist
+DROP ROLE role_4;
+ERROR HY000: Operation DROP ROLE failed for 'role_4'
+SELECT User FROM mysql.user WHERE is_role='Y' ORDER BY User;
+User
+include/rpl_end.inc

mysql-test/suite/rpl/r/rpl_create_drop_user.result

@@ -0,0 +1,46 @@
+include/master-slave.inc
+[connection master]
+CREATE USER u1@localhost IDENTIFIED BY 'abcdefghijk';
+SELECT CURRENT_USER;
+CURRENT_USER
+u1@localhost
+CREATE USER IF NOT EXISTS u2@localhost;
+SELECT CURRENT_USER;
+CURRENT_USER
+u2@localhost
+SELECT user, password FROM mysql.user WHERE user LIKE 'u%' ORDER BY user;
+user	password
+u1	*D9553C4CE316A9845CE49E30A2D7E3857AF966C4
+u2	
+SELECT user, password FROM mysql.user WHERE user LIKE 'u%' ORDER BY user;
+user	password
+u1	*D9553C4CE316A9845CE49E30A2D7E3857AF966C4
+u2	
+CREATE OR REPLACE USER u1@localhost IDENTIFIED BY 'abcdefghijk2';
+SELECT CURRENT_USER;
+CURRENT_USER
+u1@localhost
+SELECT user, password FROM mysql.user WHERE user LIKE 'u%' ORDER BY user;
+user	password
+u1	*A9A5EF53CE2EFAA6F4A746D63A917B2370971A7E
+u2	
+SELECT user, password FROM mysql.user WHERE user LIKE 'u%' ORDER BY user;
+user	password
+u1	*A9A5EF53CE2EFAA6F4A746D63A917B2370971A7E
+u2	
+CREATE USER u1@localhost;
+ERROR HY000: Operation CREATE USER failed for 'u1'@'localhost'
+DROP USER u3@localhost;
+ERROR HY000: Operation DROP USER failed for 'u3'@'localhost'
+SELECT user, password FROM mysql.user WHERE user LIKE 'u%' ORDER BY user;
+user	password
+u1	*A9A5EF53CE2EFAA6F4A746D63A917B2370971A7E
+u2	
+DROP USER IF EXISTS u1@localhost;
+DROP USER u2@localhost;
+DROP USER IF EXISTS u3@localhost;
+Warnings:
+Note	1973	Can't drop user 'u3'@'localhost'; it doesn't exist
+SELECT user, password FROM mysql.user WHERE user LIKE 'u%' ORDER BY user;
+user	password
+include/rpl_end.inc

mysql-test/suite/rpl/t/rpl_create_drop_role.test

@@ -0,0 +1,48 @@
+--source include/master-slave.inc
+
+connection master;
+CREATE ROLE role_1;
+sync_slave_with_master;
+
+SELECT User FROM mysql.user WHERE is_role='Y' ORDER BY User;
+
+connection master;
+CREATE ROLE IF NOT EXISTS role_1;
+CREATE ROLE IF NOT EXISTS role_2;
+sync_slave_with_master;
+
+SELECT User FROM mysql.user WHERE is_role='Y' ORDER BY User;
+
+connection master;
+
+--error ER_WRONG_USAGE
+CREATE OR REPLACE ROLE IF NOT EXISTS role_3; 
+
+CREATE OR REPLACE ROLE role_3; 
+CREATE OR REPLACE ROLE role_2; 
+sync_slave_with_master;
+
+SELECT User FROM mysql.user WHERE is_role='Y' ORDER BY User;
+
+connection master;
+--error ER_CANNOT_USER
+CREATE ROLE role_2;
+
+sync_slave_with_master;
+
+SELECT User FROM mysql.user WHERE is_role='Y' ORDER BY User;
+
+connection master;
+DROP ROLE role_1;
+DROP ROLE IF EXISTS role_2;
+DROP ROLE IF EXISTS role_3;
+DROP ROLE IF EXISTS role_4;
+
+--error ER_CANNOT_USER
+DROP ROLE role_4;
+
+sync_slave_with_master;
+
+SELECT User FROM mysql.user WHERE is_role='Y' ORDER BY User;
+
+--source include/rpl_end.inc

mysql-test/suite/rpl/t/rpl_create_drop_user.test

@@ -0,0 +1,51 @@
+--source include/master-slave.inc
+
+connection master;
+CREATE USER u1@localhost IDENTIFIED BY 'abcdefghijk';
+connect (user_a, localhost, u1,'abcdefghijk',);
+connection user_a;
+SELECT CURRENT_USER;
+disconnect user_a;
+
+connection master;
+CREATE USER IF NOT EXISTS u2@localhost;
+connect (user_a, localhost, u2,,);
+connection user_a;
+SELECT CURRENT_USER;
+disconnect user_a;
+
+connection master;
+SELECT user, password FROM mysql.user WHERE user LIKE 'u%' ORDER BY user;
+sync_slave_with_master;
+SELECT user, password FROM mysql.user WHERE user LIKE 'u%' ORDER BY user;
+
+connection master;
+CREATE OR REPLACE USER u1@localhost IDENTIFIED BY 'abcdefghijk2';
+connect (user_a, localhost, u1,'abcdefghijk2',);
+connection user_a;
+SELECT CURRENT_USER;
+disconnect user_a;
+connection master;
+SELECT user, password FROM mysql.user WHERE user LIKE 'u%' ORDER BY user;
+sync_slave_with_master;
+SELECT user, password FROM mysql.user WHERE user LIKE 'u%' ORDER BY user;
+
+connection master;
+--error ER_CANNOT_USER
+CREATE USER u1@localhost;
+
+--error ER_CANNOT_USER
+DROP USER u3@localhost;
+
+sync_slave_with_master;
+SELECT user, password FROM mysql.user WHERE user LIKE 'u%' ORDER BY user;
+
+connection master;
+DROP USER IF EXISTS u1@localhost;
+DROP USER u2@localhost;
+DROP USER IF EXISTS u3@localhost;
+sync_slave_with_master;
+
+SELECT user, password FROM mysql.user WHERE user LIKE 'u%' ORDER BY user;
+
+--source include/rpl_end.inc

mysql-test/t/create_drop_binlog.test

@@ -95,3 +95,27 @@ DROP VIEW IF EXISTS v1;
 --replace_regex /xid=[0-9]+/xid=XX/ /GTID [0-9]+-[0-9]+-[0-9]+/GTID #-#-#/ /Server.ver.*/VER/
 SHOW BINLOG EVENTS;
 RESET MASTER;
+
+CREATE OR REPLACE ROLE r1;
+CREATE OR REPLACE ROLE r1;
+DROP ROLE r1;
+CREATE ROLE IF NOT EXISTS r1;
+CREATE ROLE IF NOT EXISTS r1;
+DROP ROLE IF EXISTS r1;
+DROP ROLE IF EXISTS r1;
+--replace_column 1 # 2 # 5 #
+--replace_regex /xid=[0-9]+/xid=XX/ /GTID [0-9]+-[0-9]+-[0-9]+/GTID #-#-#/ /Server.ver.*/VER/
+SHOW BINLOG EVENTS;
+RESET MASTER;
+
+CREATE OR REPLACE USER u1@localhost;
+CREATE OR REPLACE USER u1@localhost;
+DROP USER u1@localhost;
+CREATE USER IF NOT EXISTS u1@localhost;
+CREATE USER IF NOT EXISTS u1@localhost;
+DROP USER IF EXISTS u1@localhost;
+DROP USER IF EXISTS u1@localhost;
+--replace_column 1 # 2 # 5 #
+--replace_regex /xid=[0-9]+/xid=XX/ /GTID [0-9]+-[0-9]+-[0-9]+/GTID #-#-#/ /Server.ver.*/VER/
+SHOW BINLOG EVENTS;
+RESET MASTER;

mysql-test/t/create_drop_role.test

@@ -0,0 +1,56 @@
+--source include/not_embedded.inc
+
+CREATE ROLE IF NOT EXISTS role1 WITH ADMIN user1;
+SELECT * FROM mysql.roles_mapping;
+DROP ROLE role1;
+
+CREATE OR REPLACE ROLE role1 WITH ADMIN user2;
+SELECT * FROM mysql.roles_mapping WHERE Role='role1';
+CREATE OR REPLACE ROLE role1 WITH ADMIN user3;
+SELECT * FROM mysql.roles_mapping WHERE Role='role1';
+CREATE ROLE IF NOT EXISTS role1 WITH ADMIN user4;
+SELECT * FROM mysql.roles_mapping WHERE Role='role1';
+DROP ROLE IF EXISTS role1;
+SELECT * FROM mysql.roles_mapping WHERE Role='role1';
+DROP ROLE IF EXISTS role1;
+
+
+CREATE ROLE role_1;
+
+CREATE ROLE IF NOT EXISTS role_1;
+CREATE OR REPLACE ROLE role_1;
+
+--error ER_WRONG_USAGE
+CREATE OR REPLACE ROLE IF NOT EXISTS role_1;
+
+--error ER_CANNOT_USER
+CREATE ROLE role_1;
+
+CREATE USER u1@localhost;
+REVOKE SHOW DATABASES ON *.* FROM 'u1'@'localhost';
+GRANT SHOW DATABASES ON *.* TO role_1;
+GRANT role_1 TO u1@localhost;
+
+connect (user_a, localhost, u1,,);
+connection user_a;
+
+SELECT CURRENT_USER;
+
+SHOW DATABASES;
+SELECT CURRENT_ROLE;
+SET ROLE role_1;
+SELECT CURRENT_ROLE;
+SHOW DATABASES;
+SET ROLE NONE;
+
+connect (user_b, localhost, root,,);
+connection user_b;
+
+--echo # Clearing up
+DROP ROLE role_1;
+DROP ROLE IF EXISTS role_1;
+
+--error ER_CANNOT_USER
+DROP ROLE role_1;
+
+DROP USER u1@localhost;

mysql-test/t/create_drop_user.test

@@ -0,0 +1,46 @@
+--source include/not_embedded.inc
+
+CREATE USER IF NOT EXISTS u1@localhost IDENTIFIED BY 'pw1';
+SELECT password FROM mysql.user WHERE user='u1';
+
+CREATE USER IF NOT EXISTS u1@localhost IDENTIFIED BY 'pw2';
+SELECT password FROM mysql.user WHERE user='u1';
+
+CREATE OR REPLACE USER u1@localhost IDENTIFIED BY 'pw3';
+SELECT password FROM mysql.user WHERE user='u1';
+
+--error ER_WRONG_USAGE
+CREATE OR REPLACE USER IF NOT EXISTS u1@localhost IDENTIFIED BY 'pw4';
+SELECT password FROM mysql.user WHERE user='u1';
+
+DROP USER IF EXISTS u1@localhost;
+DROP USER IF EXISTS u1@localhost;
+
+--error ER_CANNOT_USER
+DROP USER u1@localhost;
+
+CREATE OR REPLACE USER u1@localhost;
+
+--error ER_CANNOT_USER
+CREATE USER u1@localhost;
+
+DROP USER u1@localhost;
+
+CREATE USER u1;
+
+--error ER_CANNOT_USER
+CREATE USER u1, u2;
+
+--error ER_CANNOT_USER
+CREATE USER u2;
+
+--error ER_PASSWD_LENGTH
+CREATE OR REPLACE USER u1 IDENTIFIED BY PASSWORD 'password', u2;
+
+CREATE OR REPLACE USER u1 IDENTIFIED BY PASSWORD 'abcdefghijklmnop', u2;
+
+DROP USER u1;
+DROP USER IF EXISTS u1, u2;
+
+--error ER_CANNOT_USER
+DROP USER u2;

mysql-test/t/create_or_replace_permission.test

@@ -52,12 +52,11 @@ eval CREATE OR REPLACE FUNCTION lookup RETURNS STRING SONAME "$UDF_EXAMPLE_SO";
 --error ER_PROCACCESS_DENIED_ERROR
 CREATE OR REPLACE FUNCTION hello(str char(20)) RETURNS TEXT RETURN CONCAT('Hello, ', str, '!');
 
-# TODO: add this when "MDEV-5359 CREATE OR REPLACE..." is done
+--error ER_SPECIFIC_ACCESS_DENIED_ERROR
-#--error ER_SPECIFIC_ACCESS_DENIED_ERROR
+CREATE OR REPLACE USER u1@localhost;
-#CREATE OR REPLACE USER u1@localhost;
+
-#
+--error ER_SPECIFIC_ACCESS_DENIED_ERROR
-#--error ER_SPECIFIC_ACCESS_DENIED_ERROR
+CREATE OR REPLACE ROLE developer;
-#CREATE OR REPLACE ROLE developer;
 
 connection default;
 SELECT CURRENT_USER;

sql/share/errmsg-utf8.txt

@@ -7117,3 +7117,11 @@ ER_SET_STATEMENT_NOT_SUPPORTED 42000
         eng "The system variable %.200s cannot be set in SET STATEMENT." 
 ER_INVALID_SLAVE_PARALLEL_MODE
 	eng "Invalid use of '%s' option for slave_parallel_mode"
+ER_USER_CREATE_EXISTS
+        eng "Can't create user '%-.64s'@'%-.64s'; it already exists"
+ER_USER_DROP_EXISTS
+        eng "Can't drop user '%-.64s'@'%-.64s'; it doesn't exist"
+ER_ROLE_CREATE_EXISTS
+        eng "Can't create role '%-.64s'; it already exists"
+ER_ROLE_DROP_EXISTS
+        eng "Can't drop role '%-.64s'; it doesn't exist"

sql/sql_acl.cc

@@ -9346,7 +9346,7 @@ bool mysql_create_user(THD *thd, List <LEX_USER> &list, bool handle_as_role)
   LEX_USER *user_name;
   List_iterator <LEX_USER> user_list(list);
   TABLE_LIST tables[TABLES_MAX];
-  bool some_users_created= FALSE;
+  bool binlog= false;
   DBUG_ENTER("mysql_create_user");
   DBUG_PRINT("entry", ("Handle as %s", handle_as_role ? "role" : "user"));
 
@@ -9402,12 +9402,41 @@ bool mysql_create_user(THD *thd, List <LEX_USER> &list, bool handle_as_role)
     */
     if (handle_grant_data(tables, 0, user_name, NULL))
     {
-      append_user(thd, &wrong_users, user_name);
+      if (thd->lex->create_info.or_replace())
-      result= TRUE;
+      {
-      continue;
+        // Drop the existing user
+        if (handle_grant_data(tables, 1, user_name, NULL) <= 0)
+        {
+          // DROP failed
+          append_user(thd, &wrong_users, user_name);
+          result= true;
+          continue;
+        }
+        // Proceed with the creation
+      }
+      else if (thd->lex->create_info.if_not_exists())
+      {
+        binlog= true;
+        if (handle_as_role)
+          push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
+                              ER_ROLE_CREATE_EXISTS, ER(ER_ROLE_CREATE_EXISTS),
+                              user_name->user.str);
+        else
+          push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
+                              ER_USER_CREATE_EXISTS, ER(ER_USER_CREATE_EXISTS),
+                              user_name->user.str, user_name->host.str);
+        continue;
+      }
+      else
+      {
+        // "CREATE USER user1" for an existing user
+        append_user(thd, &wrong_users, user_name);
+        result= true;
+        continue;
+      }
     }
 
-    some_users_created= TRUE;
+    binlog= true;
     if (replace_user_table(thd, tables[USER_TABLE].table, *user_name, 0, 0, 1, 0))
     {
       append_user(thd, &wrong_users, user_name);
@@ -9454,7 +9483,7 @@ bool mysql_create_user(THD *thd, List <LEX_USER> &list, bool handle_as_role)
              (handle_as_role) ? "CREATE ROLE" : "CREATE USER",
              wrong_users.c_ptr_safe());
 
-  if (some_users_created)
+  if (binlog)
     result |= write_bin_log(thd, FALSE, thd->query(), thd->query_length());
 
   mysql_rwlock_unlock(&LOCK_grant);
@@ -9481,7 +9510,7 @@ bool mysql_drop_user(THD *thd, List <LEX_USER> &list, bool handle_as_role)
   LEX_USER *user_name, *tmp_user_name;
   List_iterator <LEX_USER> user_list(list);
   TABLE_LIST tables[TABLES_MAX];
-  bool some_users_deleted= FALSE;
+  bool binlog= false;
   ulonglong old_sql_mode= thd->variables.sql_mode;
   DBUG_ENTER("mysql_drop_user");
   DBUG_PRINT("entry", ("Handle as %s", handle_as_role ? "role" : "user"));
@@ -9500,6 +9529,7 @@ bool mysql_drop_user(THD *thd, List <LEX_USER> &list, bool handle_as_role)
 
   while ((tmp_user_name= user_list++))
   {
+    int rc;
     user_name= get_current_user(thd, tmp_user_name, false);
     if (!user_name)
     {
@@ -9516,14 +9546,30 @@ bool mysql_drop_user(THD *thd, List <LEX_USER> &list, bool handle_as_role)
       continue;
     }
 
-    if (handle_grant_data(tables, 1, user_name, NULL) <= 0)
+    if ((rc= handle_grant_data(tables, 1, user_name, NULL)) > 0)
     {
-      append_user(thd, &wrong_users, user_name);
+      // The user or role was successfully deleted
-      result= TRUE;
+      binlog= true;
       continue;
     }
 
-    some_users_deleted= TRUE;
+    if (rc == 0 && thd->lex->if_exists())
+    {
+      // "DROP USER IF EXISTS user1" for a non-existing user or role
+      if (handle_as_role)
+        push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
+                            ER_ROLE_DROP_EXISTS, ER(ER_ROLE_DROP_EXISTS),
+                            user_name->user.str);
+      else
+        push_warning_printf(thd, Sql_condition::WARN_LEVEL_NOTE,
+                            ER_USER_DROP_EXISTS, ER(ER_USER_DROP_EXISTS),
+                            user_name->user.str, user_name->host.str);
+      binlog= true;
+      continue;
+    }
+    // Internal error, or "DROP USER user1" for a non-existing user
+    append_user(thd, &wrong_users, user_name);
+    result= TRUE;
   }
 
   if (!handle_as_role)
@@ -9545,7 +9591,7 @@ bool mysql_drop_user(THD *thd, List <LEX_USER> &list, bool handle_as_role)
              (handle_as_role) ? "DROP ROLE" : "DROP USER",
              wrong_users.c_ptr_safe());
 
-  if (some_users_deleted)
+  if (binlog)
     result |= write_bin_log(thd, FALSE, thd->query(), thd->query_length());
 
   mysql_rwlock_unlock(&LOCK_grant);

sql/sql_lex.h

@@ -2851,6 +2851,11 @@ struct LEX: public Query_tables_list
     set_command(command, scope, options);
     return check_create_options(options);
   }
+  bool set_command_with_check(enum_sql_command command, DDL_options_st options)
+  {
+    set_command(command, options);
+    return check_create_options(options);
+  }
   /*
     DROP shares lex->create_info to store TEMPORARY and IF EXISTS options
     to save on extra initialization in lex_start().

sql/sql_parse.cc

@@ -4498,7 +4498,9 @@ end_with_restore_list:
   case SQLCOM_CREATE_USER:
   case SQLCOM_CREATE_ROLE:
   {
-    if (check_access(thd, INSERT_ACL, "mysql", NULL, NULL, 1, 1) &&
+    if (check_access(thd, lex->create_info.or_replace() ?
+                          INSERT_ACL | DELETE_ACL : INSERT_ACL,
+                     "mysql", NULL, NULL, 1, 1) &&
         check_global_access(thd,CREATE_USER_ACL))
       break;
     WSREP_TO_ISOLATION_BEGIN(WSREP_MYSQL_DB, NULL, NULL)

sql/sql_yacc.yy

@@ -2573,13 +2573,16 @@ create:
                MYSQL_YYABORT;
             }
           }
-        | CREATE USER clear_privileges grant_list
+        | create_or_replace USER opt_if_not_exists clear_privileges grant_list
           {
-            Lex->sql_command = SQLCOM_CREATE_USER;
+            if (Lex->set_command_with_check(SQLCOM_CREATE_USER, $1 | $3))
+              MYSQL_YYABORT;
           }
-        | CREATE ROLE_SYM clear_privileges role_list opt_with_admin
+        | create_or_replace ROLE_SYM opt_if_not_exists
+          clear_privileges role_list opt_with_admin
           {
-            Lex->sql_command = SQLCOM_CREATE_ROLE;
+            if (Lex->set_command_with_check(SQLCOM_CREATE_ROLE, $1 | $3))
+              MYSQL_YYABORT;
           }
         | CREATE LOGFILE_SYM GROUP_SYM logfile_group_info 
           {
@@ -11866,13 +11869,13 @@ drop:
             lex->set_command(SQLCOM_DROP_PROCEDURE, $3);
             lex->spname= $4;
           }
-        | DROP USER clear_privileges user_list
+        | DROP USER opt_if_exists clear_privileges user_list
           {
-            Lex->sql_command = SQLCOM_DROP_USER;
+            Lex->set_command(SQLCOM_DROP_USER, $3);
           }
-        | DROP ROLE_SYM clear_privileges role_list
+        | DROP ROLE_SYM opt_if_exists clear_privileges role_list
           {
-            Lex->sql_command = SQLCOM_DROP_ROLE;
+            Lex->set_command(SQLCOM_DROP_ROLE, $3);
           }
         | DROP VIEW_SYM opt_if_exists
           {