Re: "could not open relation 1663/16384/16584: No such file or directory" in a specific combination of transactions with temp tables

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Heikki Linnakangas <heikki(at)enterprisedb(dot)com>, John Smith <sodgodofall(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: "could not open relation 1663/16384/16584: No such file or directory" in a specific combination of transactions with temp tables
Date: 2008-03-05 03:44:07
Message-ID: 200803050344.m253i7n14772@momjian.us
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Tom Lane wrote:
> "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com> writes:
> > John Smith wrote:
> >> [3] I am not certain how widespread they might be, but I think there
> >> may be some backward compatibility concerns with the patch you are
> >> proposing.
>
> > Well, the current behavior is certainly broken, so an application
> > relying on it is in trouble anyway :-(. Even if we came up with a patch
> > for 8.4 to relax the limitation, I doubt it would be safe enough to
> > backport to stable branches.
>
> As Heikki pointed out later, PG 8.1 correctly enforces the restriction
> against preparing a transaction that has dropped a temp table. It's
> only 8.2.x and 8.3.0 that (appear to) allow this. So I'm not persuaded
> by backwards-compatibility arguments.
>
> I've applied Heikki's new patch, and I think that's as much as we can do
> for 8.2 and 8.3. Any improvement in the functionality would be new
> development (and not trivial development, either) for 8.4 or later.

Is there a TODO here?

--
Bruce Momjian <bruce(at)momjian(dot)us> http://momjian.us
EnterpriseDB http://postgres.enterprisedb.com

+ If your life is a hard drive, Christ can be your backup. +

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