BUG #2759: \df doesn't show functions with no args

The following bug has been logged online:

Bug reference:      2759
Logged by:          Leon Miller-Out
Email address:      pg_bugs@leonout.com
PostgreSQL version: 8.1.5
Operating system:   CentOS 4.4 x64
Description:        \df doesn't show functions with no args
Details:

\df doesn't show functions with no arguments.

This is a documented problem, and appears to have been fixed in April 2005,
so I'm not sure why it's showing up here.

See:
http://groups.google.com/group/pgsql.committers/browse_frm/thread/d28052b7da
9424b0/e6413772fc41324d%23e6413772fc41324d

Running pgsql -E, then \dv outputs:

SELECT n.nspname as "Schema",
  p.proname as "Name",
  CASE WHEN p.proretset THEN 'setof ' ELSE '' END ||
  pg_catalog.format_type(p.prorettype, NULL) as "Result data type",
  pg_catalog.oidvectortypes(p.proargtypes) as "Argument data types"
FROM pg_catalog.pg_proc p
     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = p.pronamespace
WHERE p.prorettype <> 'pg_catalog.cstring'::pg_catalog.regtype
      AND p.proargtypes[0] <> 'pg_catalog.cstring'::pg_catalog.regtype
      AND NOT p.proisagg
      AND pg_catalog.pg_function_is_visible(p.oid)
ORDER BY 1, 2, 3, 4;


The line

AND p.proargtypes[0] <> 'pg_catalog.cstring'::pg_catalog.regtype

Needs to be either

AND (p.proargtypes[0] <> 'pg_catalog.cstring'::pg_catalog.regtype
 OR p.proargtypes[0] IS NULL)


or gone completely. See thread at
http://archives.postgresql.org/pgsql-hackers/2005-03/msg01046.php