How to control pg_catalog results for each users?

Hello,

PostgreSQL provides pg_catalog as a system catalog.
However, PostgreSQL does not allow different users to retrieve different 
table structures or table names using pg_catalog.
For example, when SELECT * FROM pg_catalog.pg_tables is executed by 
User1 and User2, it is not possible to get different results.
In PostgreSQL, row-level security can be used to control rows in normal 
tables.
However, row-level security is not possible to set this for pg_catalog, 
and all users can get the all of table name , table structure and other 
information from pg_catalog, which is considered a security problem.
(REVOKE to the system catalog is not restricted, REVOKE can control 
access to system catalogs on a per-table basis)

Has there been any discussion or development on controlling this system 
catalog information on a per-user basis?

Regards,

Shigeo Hirose