array UNNESTed to rows stable with respect to order?

Hi all

I have created following statement to get the ordered parameter list of 
functions. I use UNNEST to get rows from array. This works fine but I am 
not sure whether the ordering remains in the later use. Background is 
PL/pgSQL to revoke grants to get a pristine start for granting. As the 
order of the parameter is important, I should use a statement that 
returns the properly ordered list of parameters. Maybe I did take a 
wrong turn and one can achieve this simpler.

Suggestions are very welcome.

Kind regards Thiemo

with PRO_UNNESTED_TYPES as(
   select
     oid as PROOID,
     PRONAME,
     unnest(PROARGTYPES) as PROARGTYPE,
     PRONAMESPACE,
     PROOWNER
   from
     PG_CATALOG.PG_PROC
) select
   P.PRONAME,
   string_agg(
     T.TYPNAME,
     ', '
   ) as PARAMETER_LIST_STRING,
   G.GRANTEE
from
   PRO_UNNESTED_TYPES P
inner join PG_CATALOG.PG_TYPE T on
   P.PROARGTYPE = T.OID
inner join PG_CATALOG.PG_NAMESPACE N on
   P.PRONAMESPACE = N.OID
inner join INFORMATION_SCHEMA.ROUTINE_PRIVILEGES G on
   -- copied from INFORMATION_SCHEMA.ROUTINE_PRIVILEGES source
  -- as seen in DBeaver 4.3.2
(
     (
       P.PRONAME::text || '_'::text
     )|| P.PROOID::text
   )::INFORMATION_SCHEMA.SQL_IDENTIFIER = G.SPECIFIC_NAME
where
   N.NSPNAME = current_user
   and G.GRANTEE != current_user
group by
   P.PROOID,
   P.PRONAME,
   G.GRANTEE
order by
   P.PRONAME asc,
   G.GRANTEE asc,
   PARAMETER_LIST_STRING asc;



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