Re: [HACKERS] Show INHERIT in \du

I've done up a patch per Tom's idea of combining the binary role
attributes into a single column.

Each attribute which differs from the default is listed on a separate
line, like so:

List of roles
Role name | Attributes | Member of
-------------+----------------+-------------------
bob | | {readers,writers}
brendanjurd | Superuser | {}
: Create role
: Create DB
harry | No inherit | {}
jim | 10 connections | {readers}
readers | No login | {}
writers | No login | {}
(6 rows)

Notes:

* The patch relies on array_to_string's current treatment of NULL
values in the array; they are ignored. If that behaviour changes in
the future, the \du output will become very ugly indeed.
* I'm not sure whether "No login" and "No inherit" are the best
phrases to use. I took my cue from the SQL setting names NOLOGIN and
NOINHERIT, but maybe something more grammatically sensible with
"Cannot login" and "No inheritance" would be preferable.
* If accepted, this patch would supercede the earlier patch mentioned
by Bernd Helmle upthread, which adds LOGIN to the output as a new
column: http://archives.postgresql.org/pgsql-patches/2007-11/msg00014.php

Cheers,
BJ