Re: alter user set local_preload_libraries.

Hello,

> > I found this issue when trying per-pg_user (role) loading of
> > auto_analyze and some tweaking tool. It is not necessarily set by
> > the user by own, but the function to decide whether to load some
> > module by the session-user would be usable, at least, as for me:)
>
> I think we could just set local_preload_libraries to PGC_USERSET and
> document that subsequent changes won't take effect. That's the same way
> session_preload_libraries works. That would avoid inventing another
> very specialized GUC context.

It is enough for me. Since the only advantage of
PGC_BACKEND_USERSET is the capability to inhibit in-session
modification and I don't see another use case for it, I have no
objection for your opinion.

> If you're interested in improving this area, I also suggest you read the
> thread of
> <http://www.postgresql.org/message-id/1349829917.29682.5.camel@vanquo.pezone.net>.

Although I don't understand even after reading this why
local_preload_libraries was PGC_SUSET, there seems to be no
reason it should be so.

The attached patch simply changes the context for local_... to
PGC_USERSET and edits the doc.

regards,

--
Kyotaro Horiguchi
NTT Open Source Software Center