[Code: 0, SQL State: 0A000] when "typing" from pg_catalog

[Thiemo Kellner <thiemo@xxxxxxxxxxxxxxxxxxxx>]

Hi

I have the following function code. When trying to install, it gives me

[Code: 0, SQL State: 0A000]  FEHLER: Verweise auf andere Datenbanken 
sind nicht implementiert: pg_catalog.pg_roles.rolname
  Position: 298  [Script position: 334 - 361]

To the best of my knowledge, pg_catalog is a schema not a database, 
like information_schema. Am I missing something? And why is it not 
allowed to type from the catalogue?

I presume, this example is rather academic due to the name type.

Kind regards

Thiemo


create or replace function GRANT_SELECTS()
returns void
language plpgsql
as
$body$
    declare
        C_SCHEMA_NAME       constant 
INFORMATION_SCHEMA.SCHEMATA.SCHEMA_NAME%type :=
          'snowrunner';
--        C_ROLE_NAME         constant    name :=
        C_ROLE_NAME         constant    PG_CATALOG.PG_ROLES.ROLNAME :=
          'snowrunner_reader';
        V_SQL_STATEMENT                 text;
    begin
        -- Check the existance of the schema
        perform 1
            from INFORMATION_SCHEMA.SCHEMATA
            where SCHEMA_NAME = C_SCHEMA_NAME;
        if not found then
            raise exception 'Schema "%s" does not exist!', C_SCHEMA_NAME;
        end if;

        -- Check the existance of the role
        perform 1
        	from PG_CATALOG.PG_ROLES
        	where ROLNAME = C_ROLE_NAME;
        if not found then
            raise exception 'Role "%s" does not exist!', C_ROLE_NAME;
        end if;

        -- Issue grants
        V_SQL_STATEMENT := format('grant select on all tables in schema 
%i to %i', C_SCHEMA_NAME, C_ROLE_NAME);
        raise info '%', V_SQL_STATEMENT;
        execute V_SQL_STATEMENT;
        V_SQL_STATEMENT := format('grant select on all views in schema 
%i to %i', C_SCHEMA_NAME, C_ROLE_NAME);
        raise info '%', V_SQL_STATEMENT;
        execute V_SQL_STATEMENT;
        V_SQL_STATEMENT := format('grant select on all materialized 
views in schema %i to %i', C_SCHEMA_NAME, C_ROLE_NAME);
        raise info '%', V_SQL_STATEMENT;
        execute V_SQL_STATEMENT;
        commit;

        return;
    end;
$body$;