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ALTER [ ROW LEVEL SECURITY ] POLICY policy_name ON table_name RENAME TO new_policy_name;

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ALTER [ ROW LEVEL SECURITY ] POLICY policy_name ON table_name
    [ TO { role_name | PUBLIC } [, ...] ]
    [ USING ( using_expression ) ];

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--创建数据表all_data。
gaussdb=# CREATE TABLE all_data(id int, role varchar(100), data varchar(100));

--创建行访问控制策略，当前用户只能查看用户自身的数据。
gaussdb=# CREATE ROW LEVEL SECURITY POLICY all_data_rls ON all_data USING(role = CURRENT_USER);
gaussdb=# \d+ all_data
                               Table "public.all_data"
 Column |          Type          | Modifiers | Storage  | Stats target | Description
--------+------------------------+-----------+----------+--------------+-------------
 id     | integer                |           | plain    |              |
 role   | character varying(100) |           | extended |              |
 data   | character varying(100) |           | extended |              |
Row Level Security Policies:
    POLICY "all_data_rls" FOR ALL
      TO public
      USING (((role)::name = "current_user"()))
Has OIDs: no
Distribute By: HASH(id)
Location Nodes: ALL DATANODES
Options: orientation=row, compression=no

--创建用户alice, bob。
gaussdb=# CREATE ROLE alice WITH PASSWORD "*********";
gaussdb=# CREATE ROLE bob WITH PASSWORD "*********";

--修改行访问控制all_data_rls的名称。
gaussdb=# ALTER ROW LEVEL SECURITY POLICY all_data_rls ON all_data RENAME TO all_data_new_rls;

--修改行访问控制策略影响的用户。
gaussdb=# ALTER ROW LEVEL SECURITY POLICY all_data_new_rls ON all_data TO alice, bob;
gaussdb=# \d+ all_data
                               Table "public.all_data"
 Column |          Type          | Modifiers | Storage  | Stats target | Description
--------+------------------------+-----------+----------+--------------+-------------
 id     | integer                |           | plain    |              |
 role   | character varying(100) |           | extended |              |
 data   | character varying(100) |           | extended |              |
Row Level Security Policies:
    POLICY "all_data_new_rls" FOR ALL
      TO alice,bob
      USING (((role)::name = "current_user"()))
Has OIDs: no
Distribute By: HASH(id)
Location Nodes: ALL DATANODES
Options: orientation=row, compression=no, enable_rowsecurity=true

--修改行访问控制策略表达式。
gaussdb=# ALTER ROW LEVEL SECURITY POLICY all_data_new_rls ON all_data USING (id > 100 AND role = current_user);
gaussdb=# \d+ all_data
                               Table "public.all_data"
 Column |          Type          | Modifiers | Storage  | Stats target | Description
--------+------------------------+-----------+----------+--------------+-------------
 id     | integer                |           | plain    |              |
 role   | character varying(100) |           | extended |              |
 data   | character varying(100) |           | extended |              |
Row Level Security Policies:
    POLICY "all_data_new_rls" FOR ALL
      TO alice,bob
      USING (((id > 100) AND ((role)::name = "current_user"())))
Has OIDs: no
Distribute By: HASH(id)
Location Nodes: ALL DATANODES
Options: orientation=row, compression=no, enable_rowsecurity=true

--删除用户alice, bob。
gaussdb=# DROP ROLE alice, bob;

--删除访问控制策略。
gaussdb=# DROP ROW LEVEL SECURITY POLICY all_data_new_rls ON all_data;

--删除数据表all_data。
gaussdb=# DROP TABLE all_data;