[MDEV-7978] Post review fixes and cleanups.

* Maintain coding style in sql_yacc.yy in regards to optional clauses.
* Remove unused variable from sql_acl.cc.
* Update test case

mysql-test/r/alter_user.result

@@ -47,7 +47,7 @@ alter if exists user boo;
 Warnings:
 Error	1133	Can't find any matching row in the user table
 Note	1396	Operation ALTER USER failed for 'boo'
-# Test SSL related altering.
+# Test password related altering.
 alter user foo identified by 'something';
 select * from mysql.user where user = 'foo';
 Host	User	Password	Select_priv	Insert_priv	Update_priv	Delete_priv	Create_priv	Drop_priv	Reload_priv	Shutdown_priv	Process_priv	File_priv	Grant_priv	References_priv	Index_priv	Alter_priv	Show_db_priv	Super_priv	Create_tmp_table_priv	Lock_tables_priv	Execute_priv	Repl_slave_priv	Repl_client_priv	Create_view_priv	Show_view_priv	Create_routine_priv	Alter_routine_priv	Create_user_priv	Event_priv	Trigger_priv	Create_tablespace_priv	ssl_type	ssl_cipher	x509_issuer	x509_subject	max_questions	max_updates	max_connections	max_user_connections	plugin	authentication_string	password_expired	is_role	default_role	max_statement_time
@@ -68,12 +68,26 @@ alter user foo identified with 'somecoolplugin' using 'somecoolpassphrase';
 select * from mysql.user where user = 'foo';
 Host	User	Password	Select_priv	Insert_priv	Update_priv	Delete_priv	Create_priv	Drop_priv	Reload_priv	Shutdown_priv	Process_priv	File_priv	Grant_priv	References_priv	Index_priv	Alter_priv	Show_db_priv	Super_priv	Create_tmp_table_priv	Lock_tables_priv	Execute_priv	Repl_slave_priv	Repl_client_priv	Create_view_priv	Show_view_priv	Create_routine_priv	Alter_routine_priv	Create_user_priv	Event_priv	Trigger_priv	Create_tablespace_priv	ssl_type	ssl_cipher	x509_issuer	x509_subject	max_questions	max_updates	max_connections	max_user_connections	plugin	authentication_string	password_expired	is_role	default_role	max_statement_time
 %	foo		N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	Y	N	N	N	N	N	N	N	N	N	Y	N	N	N					0	0	0	0	somecoolplugin	somecoolpassphrase	N	N		0.000000
+# Test ssl related altering.
+alter user foo identified by 'something' require SSL;
+select * from mysql.user where user = 'foo';
+Host	User	Password	Select_priv	Insert_priv	Update_priv	Delete_priv	Create_priv	Drop_priv	Reload_priv	Shutdown_priv	Process_priv	File_priv	Grant_priv	References_priv	Index_priv	Alter_priv	Show_db_priv	Super_priv	Create_tmp_table_priv	Lock_tables_priv	Execute_priv	Repl_slave_priv	Repl_client_priv	Create_view_priv	Show_view_priv	Create_routine_priv	Alter_routine_priv	Create_user_priv	Event_priv	Trigger_priv	Create_tablespace_priv	ssl_type	ssl_cipher	x509_issuer	x509_subject	max_questions	max_updates	max_connections	max_user_connections	plugin	authentication_string	password_expired	is_role	default_role	max_statement_time
+%	foo	*88C89BE093D4ECF72D039F62EBB7477EA1FD4D63	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	Y	N	N	N	N	N	N	N	N	N	Y	N	N	N	ANY				0	0	0	0			N	N		0.000000
+alter user foo identified by 'something' require X509;
+select * from mysql.user where user = 'foo';
+Host	User	Password	Select_priv	Insert_priv	Update_priv	Delete_priv	Create_priv	Drop_priv	Reload_priv	Shutdown_priv	Process_priv	File_priv	Grant_priv	References_priv	Index_priv	Alter_priv	Show_db_priv	Super_priv	Create_tmp_table_priv	Lock_tables_priv	Execute_priv	Repl_slave_priv	Repl_client_priv	Create_view_priv	Show_view_priv	Create_routine_priv	Alter_routine_priv	Create_user_priv	Event_priv	Trigger_priv	Create_tablespace_priv	ssl_type	ssl_cipher	x509_issuer	x509_subject	max_questions	max_updates	max_connections	max_user_connections	plugin	authentication_string	password_expired	is_role	default_role	max_statement_time
+%	foo	*88C89BE093D4ECF72D039F62EBB7477EA1FD4D63	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	Y	N	N	N	N	N	N	N	N	N	Y	N	N	N	X509				0	0	0	0			N	N		0.000000
+alter user foo identified by 'something'
+require cipher 'text' issuer 'foo_issuer' subject 'foo_subject';
+select * from mysql.user where user = 'foo';
+Host	User	Password	Select_priv	Insert_priv	Update_priv	Delete_priv	Create_priv	Drop_priv	Reload_priv	Shutdown_priv	Process_priv	File_priv	Grant_priv	References_priv	Index_priv	Alter_priv	Show_db_priv	Super_priv	Create_tmp_table_priv	Lock_tables_priv	Execute_priv	Repl_slave_priv	Repl_client_priv	Create_view_priv	Show_view_priv	Create_routine_priv	Alter_routine_priv	Create_user_priv	Event_priv	Trigger_priv	Create_tablespace_priv	ssl_type	ssl_cipher	x509_issuer	x509_subject	max_questions	max_updates	max_connections	max_user_connections	plugin	authentication_string	password_expired	is_role	default_role	max_statement_time
+%	foo	*88C89BE093D4ECF72D039F62EBB7477EA1FD4D63	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	Y	N	N	N	N	N	N	N	N	N	Y	N	N	N	SPECIFIED	text	foo_issuer	foo_subject	0	0	0	0			N	N		0.000000
 # Test resource limits altering.
 alter user foo with MAX_QUERIES_PER_HOUR 10
 MAX_UPDATES_PER_HOUR 20
 MAX_CONNECTIONS_PER_HOUR 30
 MAX_USER_CONNECTIONS 40;
 select * from mysql.user where user = 'foo';
 Host	User	Password	Select_priv	Insert_priv	Update_priv	Delete_priv	Create_priv	Drop_priv	Reload_priv	Shutdown_priv	Process_priv	File_priv	Grant_priv	References_priv	Index_priv	Alter_priv	Show_db_priv	Super_priv	Create_tmp_table_priv	Lock_tables_priv	Execute_priv	Repl_slave_priv	Repl_client_priv	Create_view_priv	Show_view_priv	Create_routine_priv	Alter_routine_priv	Create_user_priv	Event_priv	Trigger_priv	Create_tablespace_priv	ssl_type	ssl_cipher	x509_issuer	x509_subject	max_questions	max_updates	max_connections	max_user_connections	plugin	authentication_string	password_expired	is_role	default_role	max_statement_time
-%	foo		N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	Y	N	N	N	N	N	N	N	N	N	Y	N	N	N					10	20	30	40	somecoolplugin	somecoolpassphrase	N	N		0.000000
+%	foo	*88C89BE093D4ECF72D039F62EBB7477EA1FD4D63	N	N	N	N	N	N	N	N	N	N	N	N	N	N	N	Y	N	N	N	N	N	N	N	N	N	Y	N	N	N	SPECIFIED	text	foo_issuer	foo_subject	10	20	30	40			N	N		0.000000
 drop user foo;

mysql-test/t/alter_user.test

@@ -45,7 +45,7 @@ alter user boo;
 --echo #--warning ER_CANNOT_USER
 alter if exists user boo;
 
---echo # Test SSL related altering.
+--echo # Test password related altering.
 alter user foo identified by 'something';
 select * from mysql.user where user = 'foo';
 
@@ -61,6 +61,17 @@ select * from mysql.user where user = 'foo';
 alter user foo identified with 'somecoolplugin' using 'somecoolpassphrase';
 select * from mysql.user where user = 'foo';
 
+--echo # Test ssl related altering.
+alter user foo identified by 'something' require SSL;
+select * from mysql.user where user = 'foo';
+
+alter user foo identified by 'something' require X509;
+select * from mysql.user where user = 'foo';
+
+alter user foo identified by 'something'
+require cipher 'text' issuer 'foo_issuer' subject 'foo_subject';
+select * from mysql.user where user = 'foo';
+
 --echo # Test resource limits altering.
 alter user foo with MAX_QUERIES_PER_HOUR 10
                     MAX_UPDATES_PER_HOUR 20

sql/sql_acl.cc

@@ -7907,7 +7907,6 @@ bool mysql_show_create_user(THD *thd, LEX_USER *lex_user)
     hostname= thd->security_ctx->priv_host;
   }
 
-  String field_name(buff, sizeof(buff), system_charset_info);
   List<Item> field_list;
   strxmov(buff, "CREATE USER for ", username, "@", hostname, NullS);
   Item_string *field = new (thd->mem_root) Item_string_ascii(thd, "", 0);

sql/sql_yacc.yy

@@ -2532,7 +2532,7 @@ create:
           }
           view_or_trigger_or_sp_or_event { }
         | create_or_replace USER opt_if_not_exists clear_privileges grant_list
-          require_clause resource_options
+          opt_require_clause opt_resource_options
           {
             if (Lex->set_command_with_check(SQLCOM_CREATE_USER, $1 | $3))
               MYSQL_YYABORT;
@@ -7107,8 +7107,9 @@ alter:
             lex->sql_command= SQLCOM_ALTER_SERVER;
             lex->server_options.reset($3);
           } OPTIONS_SYM '(' server_options_list ')' { }
+          /* ALTER USER foo is allowed for MySQL compatibility. */
         | ALTER opt_if_exists USER clear_privileges grant_list
-          require_clause resource_options
+          opt_require_clause opt_resource_options
           {
             Lex->create_info.set($2);
             Lex->sql_command= SQLCOM_ALTER_USER;
@@ -15055,14 +15056,14 @@ grant:
 
 grant_command:
           grant_privileges ON opt_table grant_ident TO_SYM grant_list
-          require_clause grant_options
+          opt_require_clause opt_grant_options
           {
             LEX *lex= Lex;
             lex->sql_command= SQLCOM_GRANT;
             lex->type= 0;
           }
         | grant_privileges ON FUNCTION_SYM grant_ident TO_SYM grant_list
-          require_clause grant_options
+          opt_require_clause opt_grant_options
           {
             LEX *lex= Lex;
             if (lex->columns.elements)
@@ -15074,7 +15075,7 @@ grant_command:
             lex->type= TYPE_ENUM_FUNCTION;
           }
         | grant_privileges ON PROCEDURE_SYM grant_ident TO_SYM grant_list
-          require_clause grant_options
+          opt_require_clause opt_grant_options
           {
             LEX *lex= Lex;
             if (lex->columns.elements)
@@ -15411,7 +15412,7 @@ column_list_id:
           }
         ;
 
-require_clause:
+opt_require_clause:
           /* empty */
         | REQUIRE_SYM require_list
           {
@@ -15469,13 +15470,13 @@ resource_option_list:
 	| resource_option {}
         ;
 
-resource_options:
+opt_resource_options:
 	  /* empty */ {}
 	| WITH resource_option_list
         ;
 
 
-grant_options:
+opt_grant_options:
           /* empty */ {}
         | WITH grant_option_list {}
         ;