| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Adam Brightwell <adam(dot)brightwell(at)crunchydatasolutions(dot)com> |
| Cc: | Stephen Frost <sfrost(at)snowman(dot)net>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Craig Ringer <craig(at)hobby(dot)2ndquadrant(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)hobby(dot)2ndquadrant(dot)com>, Andres Freund <andres(at)hobby(dot)2ndquadrant(dot)com>, Greg Smith <greg(at)hobby(dot)2ndquadrant(dot)com>, Yeb Havinga <yeb(dot)havinga(at)portavita(dot)nl> |
| Subject: | Re: API change advice: Passing plan invalidation info from the rewriter into the planner? |
| Date: | 2014-06-10 18:19:41 |
| Message-ID: | 2089.1402424381@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Adam Brightwell <adam(dot)brightwell(at)crunchydatasolutions(dot)com> writes:
> Through this effort, we have concluded that for RLS the case of
> invalidating a plan is only necessary when switching between a superuser
> and a non-superuser. Obviously, re-planning on every role change would be
> too costly, but this approach should help minimize that cost. As well,
> there were not any cases outside of this one that were immediately apparent
> with respect to RLS that would require re-planning on a per userid basis.
Hm ... I'm not following why we'd need a special case for superusers and
not anyone else? Seems like any useful RLS scheme is going to require
more privilege levels than just superuser and not-superuser.
Could we put the "if superuser then ok" test into the RLS condition test
and thereby not need more than one plan at all?
regards, tom lane
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