Improve function query performance

sql/postgrest.sql

@@ -497,7 +497,6 @@ $$
   arguments AS (
     SELECT
       p.oid as proc_oid,
-      p.proname,
       pa.idx AS idx,
       COALESCE(pa.name, '') as name,
       type,
@@ -538,8 +537,8 @@ $$
       t_arr.typrelid AS item_composite_oid,
       t_arr.oid AS item_data_type_id,
       COALESCE(mode = 'v', FALSE) AS is_variadic
-    FROM pg_proc p,
-      unnest(proargnames, proargtypes, proargmodes)
+    FROM pg_proc p
+      CROSS JOIN unnest(proargnames, proargtypes, proargmodes)
         WITH ORDINALITY AS pa (name, type, mode, idx)
       JOIN (pg_type t JOIN pg_namespace nt ON t.typnamespace = nt.oid)
         ON pa.type = t.oid
@@ -631,7 +630,6 @@ $$
   LEFT JOIN LATERAL unnest(proconfig) timeout_config ON timeout_config like 'statement_timeout%'
   WHERE t.oid <> 'trigger'::regtype AND COALESCE(a.callable, true)
     AND prokind = 'f'
-    AND pn.nspname = ANY(schemas)
 $$;
 
 create or replace function postgrest_get_schema_description(schema text)