Re: Missing variable "role" in "pg_settings"?

"Florian G. Pflug" <fgp@phlo.org> writes:
> The per-session variable "role" is not shown when
> doing "select pg_settings". It is, however, possible
> to set it using "set role ...", and to query it using
> "show role". Is this per design, or is this a bug.

It's marked NO_SHOW_ALL in guc.c.  I'm not sure about the reasoning
for this --- session_authorization is the same way, and we probably
just copied that when we made the role variable; but I've forgotten
what the rationale for marking session_authorization as NO_SHOW_ALL
was.

> In case omiting role from pg_settings is per design,
> how could pgadmin find _all_ variables that can be set per user?

If this is an argument for not having *any* NO_SHOW_ALL variables,
I think the answer will be "no".

            regards, tom lane