role_usage_grants
   The view role_usage_grants identifies
   USAGE privileges granted on various kinds of
   objects where the grantor or grantee is a currently enabled role.
   Further information can be found under
   usage_privileges.  The only effective difference
   between this view and usage_privileges is that
   this view omits objects that have been made accessible to the
   current user by way of a grant to PUBLIC.
  
Table 36.37. role_usage_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 | 
object_catalog | sql_identifier | Name of the database containing the object (always the current database) | 
object_schema | sql_identifier | Name of the schema containing the object, if applicable, else an empty string | 
object_name | sql_identifier | Name of the object | 
object_type | character_data | COLLATION or DOMAIN or FOREIGN DATA WRAPPER or FOREIGN SERVER or SEQUENCE | 
privilege_type | character_data | Always USAGE | 
is_grantable | yes_or_no | YES if the privilege is grantable, NO if not |