From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Dimitri Fontaine <dimitri(at)2ndquadrant(dot)fr>, Bruce Momjian <bruce(at)momjian(dot)us>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Extensions versus pg_upgrade |
Date: | 2011-02-09 03:28:22 |
Message-ID: | AANLkTimSniGN=0zOEf6kDkB4JZkD=arG0G__JAkmh+fR@mail.gmail.com |
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Lists: | pgsql-hackers |
On Tue, Feb 8, 2011 at 10:25 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> On Tue, Feb 8, 2011 at 9:48 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>>> Like ALTER THING SET SCHEMA, ALTER THING SET EXTENSION is implicitly
>>> assuming that there can be only one owning extension for an object.
>
>> I would assume that we would enforce that constraint anyway. No?
>> Otherwise when you drop one of the two extensions, what happens to the
>> object? Seems necessary for sanity.
>
> Not sure --- what about nested extensions, for instance? Or you could
> think about objects that are shared between two extensions, and go away
> only if all those extensions are dropped. (RPM has exactly that
> behavior for files owned by multiple packages, to take a handy example.)
>
> My point is that the current restriction to just one containing
> extension seems to me to be an implementation restriction, rather than
> something inherent in the concept of extensions. I have no intention of
> trying to relax that restriction in the near future --- I'm just
> pointing out that it could become an interesting thing to do.
OK. My point was that I think we should definitely *enforce* that
restriction until we have a very clear vision of what it means to do
anything else, so it sounds like we're basically in agreement.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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