role_udt_grants   The view role_udt_grants is intended to identify
   USAGE privileges granted on user-defined types
   where the grantor or grantee is a currently enabled role.  Further
   information can be found under
   udt_privileges.  The only effective difference
   between this view and udt_privileges is that
   this view omits objects that have been made accessible to the
   current user by way of a grant to PUBLIC.  Since
   data types do not have real privileges in PostgreSQL, but only an
   implicit grant to PUBLIC, this view is empty.
  
Table 36.35. role_udt_grants Columns
| Name | Data Type | Description | 
|---|---|---|
| grantor | sql_identifier | The name of the role that granted the privilege | 
| grantee | sql_identifier | The name of the role that the privilege was granted to | 
| udt_catalog | sql_identifier | Name of the database containing the type (always the current database) | 
| udt_schema | sql_identifier | Name of the schema containing the type | 
| udt_name | sql_identifier | Name of the type | 
| privilege_type | character_data | Always TYPE USAGE | 
| is_grantable | yes_or_no | YESif the privilege is grantable,NOif not |