Add description about user ATTRIBUTE

TOC.md

@@ -806,6 +806,7 @@
         - [`TIKV_REGION_PEERS`](/information-schema/information-schema-tikv-region-peers.md)
         - [`TIKV_REGION_STATUS`](/information-schema/information-schema-tikv-region-status.md)
         - [`TIKV_STORE_STATUS`](/information-schema/information-schema-tikv-store-status.md)
+        - [`USER_ATTRIBUTES`](/information-schema/information-schema-user-attributes.md)
         - [`USER_PRIVILEGES`](/information-schema/information-schema-user-privileges.md)
         - [`VARIABLES_INFO`](/information-schema/information-schema-variables-info.md)
         - [`VIEWS`](/information-schema/information-schema-views.md)

information-schema/information-schema-user-attributes.md

@@ -0,0 +1,49 @@
+---
+title: USER_ATTRIBUTES
+summary: Learn the `USER_ATTRIBUTES` INFORMATION_SCHEMA table.
+---
+
+# USER_ATTRIBUTES
+
+The `USER_PRIVILEGES` table provides information about user comments and user attributes. This information comes from the `mysql.user` system table.
+
+```sql
+USE information_schema;
+DESC user_attributes;
+```
+
+```sql
++-----------+--------------+------+------+---------+-------+
+| Field     | Type         | Null | Key  | Default | Extra |
++-----------+--------------+------+------+---------+-------+
+| USER      | varchar(32)  | NO   |      | NULL    |       |
+| HOST      | varchar(255) | NO   |      | NULL    |       |
+| ATTRIBUTE | longtext     | YES  |      | NULL    |       |
++-----------+--------------+------+------+---------+-------+
+3 rows in set (0.00 sec)
+```
+
+Fields in the `USER_ATTRIBUTES` table are described as follows:
+
+* `USER`: The user name.
+* `HOST`: The host from which the user can connect to TiDB. If the value of this field is `％`, it means that the user can connect to TiDB from any host.
+* `ATTRIBUTE`: The comment and attribute of the user, which are set by the [`CREATE USER`](/sql-statements/sql-statement-create-user.md) or [`ALTER USER`](/sql-statements/sql-statement-alter-user.md) statement.
+
+The following is an example:
+
+```sql
+CREATE USER testuser1 COMMENT 'This user is created only for test';
+CREATE USER testuser2 ATTRIBUTE '{"email": "[email protected]"}';
+SELECT * FROM information_schema.user_attributes;
+```
+
+```sql
++-----------+------+---------------------------------------------------+
+| USER      | HOST | ATTRIBUTE                                         |
++-----------+------+---------------------------------------------------+
+| root      | %    | NULL                                              |
+| testuser1 | %    | {"comment": "This user is created only for test"} |
+| testuser2 | %    | {"email": "[email protected]"}                     |
++-----------+------+---------------------------------------------------+
+3 rows in set (0.00 sec)
+```

information-schema/information-schema.md

@@ -44,6 +44,7 @@ Many `INFORMATION_SCHEMA` tables have a corresponding `SHOW` command. The benefi
 | [`TABLE_CONSTRAINTS`](/information-schema/information-schema-table-constraints.md)      | Provides information on primary keys, unique indexes and foreign keys. |
 | `TABLE_PRIVILEGES`                                                                      | Not implemented by TiDB. Returns zero rows. |
 | `TRIGGERS`                                                                              | Not implemented by TiDB. Returns zero rows. |
+| [`USER_ATTRIBUTES`](/information-schema/information-schema-user-attributes.md) | Summarizes information about user comments and user attributes. |
 | [`USER_PRIVILEGES`](/information-schema/information-schema-user-privileges.md)          | Summarizes the privileges associated with the current user. |
 | [`VARIABLES_INFO`](/information-schema/information-schema-variables-info.md)            | Provides information about TiDB system variables. |
 | [`VIEWS`](/information-schema/information-schema-views.md)                              | Provides a list of views that the current user has visibility of. Similar to running `SHOW FULL TABLES WHERE table_type = 'VIEW'` |

sql-statements/sql-statement-alter-user.md

@@ -12,7 +12,7 @@ This statement changes an existing user inside the TiDB privilege system. In the
 
 ```ebnf+diagram
 AlterUserStmt ::=
-    'ALTER' 'USER' IfExists (UserSpecList RequireClauseOpt ConnectionOptions LockOption | 'USER' '(' ')' 'IDENTIFIED' 'BY' AuthString)
+    'ALTER' 'USER' IfExists (UserSpecList RequireClauseOpt ConnectionOptions LockOption AttributeOption | 'USER' '(' ')' 'IDENTIFIED' 'BY' AuthString)
 
 UserSpecList ::=
     UserSpec ( ',' UserSpec )*
@@ -27,6 +27,8 @@ AuthOption ::=
     ( 'IDENTIFIED' ( 'BY' ( AuthString | 'PASSWORD' HashString ) | 'WITH' StringName ( 'BY' AuthString | 'AS' HashString )? ) )?
 
 LockOption ::= ( 'ACCOUNT' 'LOCK' | 'ACCOUNT' 'UNLOCK' )?
+
+AttributeOption ::= ( 'COMMENT' CommentString | 'ATTRIBUTE' AttributeString )?
 ```
 
 ## Examples
@@ -63,14 +65,58 @@ ALTER USER 'newuser' ACCOUNT LOCK;
 Query OK, 0 rows affected (0.02 sec)
 ```
 
+Modify the attributes of `newuser`:
+
+```sql
+ALTER USER 'newuser' ATTRIBUTE '{"newAttr": "value", "deprecatedAttr": null}';
+SELECT * FROM information_schema.user_attributes;
+```
+
+```sql
++-----------+------+--------------------------+
+| USER      | HOST | ATTRIBUTE                |
++-----------+------+--------------------------+
+| newuser   | %    | {"newAttr": "value"}     |
++-----------+------+--------------------------+
+1 rows in set (0.00 sec)
+```
+
+Modify the comment of `newuser` using `ALTER USER ... COMMENT`:
+
+```sql
+ALTER USER 'newuser' COMMENT 'Here is the comment';
+SELECT * FROM information_schema.user_attributes;
+```
+
+```sql
++-----------+------+--------------------------------------------------------+
+| USER      | HOST | ATTRIBUTE                                              |
++-----------+------+--------------------------------------------------------+
+| newuser   | %    | {"comment": "Here is the comment", "newAttr": "value"} |
++-----------+------+--------------------------------------------------------+
+1 rows in set (0.00 sec)
+```
+
+Remove the comment of `newuser` using `ALTER USER ... ATTRIBUTE`:
+
+```sql
+ALTER USER 'newuser' ATTRIBUTE '{"comment": null}';
+SELECT * FROM information_schema.user_attributes;
+```
+
+```sql
++-----------+------+---------------------------+
+| USER      | HOST | ATTRIBUTE                 |
++-----------+------+---------------------------+
+| newuser   | %    | {"newAttr": "value"}      |
++-----------+------+---------------------------+
+1 rows in set (0.00 sec)
+```
+
 > **Note:**
 >
 > Do not use `ACCOUNT UNLOCK` to unlock a [role](/sql-statements/sql-statement-create-role.md). Otherwise, the unlocked role can be used to log in to TiDB without password.
 
-## MySQL compatibility
-
-* In MySQL this statement is used to change attributes such as to expire a password. This functionality is not yet supported by TiDB.
-
 ## See also
 
 <CustomContent platform="tidb">

sql-statements/sql-statement-create-user.md

@@ -12,7 +12,7 @@ This statement creates a new user, specified with a password. In the MySQL privi
 
 ```ebnf+diagram
 CreateUserStmt ::=
-    'CREATE' 'USER' IfNotExists UserSpecList RequireClauseOpt ConnectionOptions LockOption
+    'CREATE' 'USER' IfNotExists UserSpecList RequireClauseOpt ConnectionOptions LockOption AttributeOption
 
 IfNotExists ::=
     ('IF' 'NOT' 'EXISTS')?
@@ -31,6 +31,8 @@ StringName ::=
 |   Identifier
 
 LockOption ::= ( 'ACCOUNT' 'LOCK' | 'ACCOUNT' 'UNLOCK' )?
+
+AttributeOption ::= ( 'COMMENT' CommentString | 'ATTRIBUTE' AttributeString )?
 ```
 
 ## Examples
@@ -73,6 +75,38 @@ CREATE USER 'newuser5'@'%' ACCOUNT LOCK;
 Query OK, 1 row affected (0.02 sec)
 ```
 
+Create a user with a comment.
+
+```sql
+CREATE USER 'newuser6'@'%' COMMENT 'This user is created only for test';
+SELECT * FROM information_schema.user_attributes;
+```
+
+```
++-----------+------+---------------------------------------------------+
+| USER      | HOST | ATTRIBUTE                                         |
++-----------+------+---------------------------------------------------+
+| newuser6  | %    | {"comment": "This user is created only for test"} |
++-----------+------+---------------------------------------------------+
+1 rows in set (0.00 sec)
+```
+
+Create a user with an `email` attribute.
+
+```sql
+CREATE USER 'newuser7'@'%' ATTRIBUTE '{"email": "[email protected]"}';
+SELECT * FROM information_schema.user_attributes;
+```
+
+```sql
++-----------+------+---------------------------------------------------+
+| USER      | HOST | ATTRIBUTE                                         |
++-----------+------+---------------------------------------------------+
+| newuser7  | %    | {"email": "[email protected]"} |
++-----------+------+---------------------------------------------------+
+1 rows in set (0.00 sec)
+```
+
 ## MySQL compatibility
 
 The following `CREATE USER` options are not yet supported by TiDB, and will be parsed but ignored:

sql-statements/sql-statement-show-columns-from.md

@@ -111,44 +111,49 @@ mysql> show full columns from v1;
 1 row in set (0.00 sec)
 
 mysql> show full columns from mysql.user;
-+-----------------------+---------------+-------------+------+------+---------+-------+---------------------------------+---------+
-| Field                 | Type          | Collation   | Null | Key  | Default | Extra | Privileges                      | Comment |
-+-----------------------+---------------+-------------+------+------+---------+-------+---------------------------------+---------+
-| Host                  | char(64)      | utf8mb4_bin | NO   | PRI  | NULL    |       | select,insert,update,references |         |
-| User                  | char(32)      | utf8mb4_bin | NO   | PRI  | NULL    |       | select,insert,update,references |         |
-| authentication_string | text          | utf8mb4_bin | YES  |      | NULL    |       | select,insert,update,references |         |
-| Select_priv           | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Insert_priv           | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Update_priv           | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Delete_priv           | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Create_priv           | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Drop_priv             | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Process_priv          | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Grant_priv            | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| References_priv       | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Alter_priv            | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Show_db_priv          | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Super_priv            | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Create_tmp_table_priv | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Lock_tables_priv      | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Execute_priv          | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Create_view_priv      | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Show_view_priv        | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Create_routine_priv   | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Alter_routine_priv    | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Index_priv            | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Create_user_priv      | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Event_priv            | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Trigger_priv          | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Create_role_priv      | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Drop_role_priv        | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Account_locked        | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Shutdown_priv         | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Reload_priv           | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| FILE_priv             | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-| Config_priv           | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
-+-----------------------+---------------+-------------+------+------+---------+-------+---------------------------------+---------+
-33 rows in set (0.01 sec)
++------------------------+---------------+-------------+------+------+---------+-------+---------------------------------+---------+
+| Field                  | Type          | Collation   | Null | Key  | Default | Extra | Privileges                      | Comment |
++------------------------+---------------+-------------+------+------+---------+-------+---------------------------------+---------+
+| Host                   | char(255)     | utf8mb4_bin | NO   | PRI  | NULL    |       | select,insert,update,references |         |
+| User                   | char(32)      | utf8mb4_bin | NO   | PRI  | NULL    |       | select,insert,update,references |         |
+| authentication_string  | text          | utf8mb4_bin | YES  |      | NULL    |       | select,insert,update,references |         |
+| plugin                 | char(64)      | utf8mb4_bin | YES  |      | NULL    |       | select,insert,update,references |         |
+| Select_priv            | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Insert_priv            | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Update_priv            | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Delete_priv            | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Create_priv            | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Drop_priv              | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Process_priv           | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Grant_priv             | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| References_priv        | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Alter_priv             | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Show_db_priv           | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Super_priv             | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Create_tmp_table_priv  | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Lock_tables_priv       | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Execute_priv           | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Create_view_priv       | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Show_view_priv         | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Create_routine_priv    | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Alter_routine_priv     | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Index_priv             | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Create_user_priv       | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Event_priv             | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Repl_slave_priv        | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Repl_client_priv       | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Trigger_priv           | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Create_role_priv       | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Drop_role_priv         | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Account_locked         | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Shutdown_priv          | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Reload_priv            | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| FILE_priv              | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Config_priv            | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| Create_Tablespace_Priv | enum('N','Y') | utf8mb4_bin | NO   |      | N       |       | select,insert,update,references |         |
+| User_attributes        | json          | NULL        | YES  |      | NULL    |       | select,insert,update,references |         |
++------------------------+---------------+-------------+------+------+---------+-------+---------------------------------+---------+
+38 rows in set (0.00 sec)
 ```
 
 ## MySQL compatibility