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In-Reply-To: 
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From: Alexander Korotkov <aekorotkov@gmail.com>
Date: Tue, 21 Apr 2026 13:54:47 +0300
Message-ID: 
 <CAPpHfdvLCgXgdhSvuPCkek+r=P4E-WiNceWfh7UQztiMzfFcvg@mail.gmail.com>
Subject: Re: Fix bug with accessing to temporary tables of other sessions
To: Soumya S Murali <soumyamurali.work@gmail.com>
Cc: Jim Jones <jim.jones@uni-muenster.de>,
 Daniil Davydov <3danissimo@gmail.com>,
	Tom Lane <tgl@sss.pgh.pa.us>, Stepan Neretin <slpmcf@gmail.com>,
	PostgreSQL Hackers <pgsql-hackers@postgresql.org>
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On Tue, Apr 21, 2026 at 8:44=E2=80=AFAM Soumya S Murali
<soumyamurali.work@gmail.com> wrote:
> Thank you for reviewing the patch and for the detailed explanation.
>
> On Tue, Apr 21, 2026 at 1:37=E2=80=AFAM Alexander Korotkov <aekorotkov@gm=
ail.com> wrote:
> >
> > Hi!
> >
> > I've checked the thread.  Thanks to all the participants for their
> > work.  I think there is a general agreement on the design.
> >
> > On Thu, Apr 16, 2026 at 9:41=E2=80=AFAM Soumya S Murali
> > <soumyamurali.work@gmail.com> wrote:
> > > Thank you for the guidance and the updated patch.
> > >
> > > On Mon, Apr 13, 2026 at 7:26=E2=80=AFPM Jim Jones <jim.jones@uni-muen=
ster.de> wrote:
> > > >
> > > > Hi
> > > >
> > > > On 13/04/2026 14:40, Soumya S Murali wrote:
> > > > > Please let me know if there are additional scenarios I should
> > > > > validate. Looking forward to more feedback.
> > > >
> > > > Thanks for testing it. You can take a look at
> > > > 012_temp_obj_multisession.pl and check if we missed any path.
> > > >
> > > > Due to changes introduced in b2a17ba7a5d the patch was no longer
> > > > applying. See rebased v18 attached.
> > > >
> > >
> > >
> > > I tested the rebased v18 patch on a clean tree and verified that it
> > > applies cleanly and behaves consistently with previous results.
> > > Cross-session access is correctly blocked with: ERROR: cannot access
> > > temporary relations of other sessions
> > > Index scan paths are also properly restricted, and same-session acces=
s
> > > continues to work as expected.
> > > The updated test changes look good. Everything works as expected, +1
> > > from my side.
> >
> > I see the patch changes the error wording.  Previously the error was
> > "cannot access temporary tables of other sessions", but we change it
> > to "cannot access temporary relation of other sessions".  I see the
> > intention here: we trigger an error while accessing some relation (not
> > necessarily a table) then we should reflect this directly to the error
> > message.  However, old message is already here for quite a while and
> > translated into many languages.  Also, is old message incorrect?  We
> > trigger an error on buffer access.  That is, we trigger an error only
> > for relation with a storage: table, index, sequence or matview.
> > Matview can't be temporary.  Also, if you access an index with a
> > query, that means you're querying its table.  But sequence can be
> > temporary and it can be not directly associated with a table.  So,
> > yes, new error message is more correct.  But I would prefer to make it
> > a separate patch, and replace all the occurrences including contrib.
> >
>
>
> This makes sense. While the new wording is indeed more precise, I
> agree that changing an existing error message, especially one that has
> been present for a long time and is already translated, should be
> handled
> separately from the bug fix. Keeping the current message for this
> patch and addressing wording improvements in a dedicated follow-up
> patch sounds like the right approach.
> Thanks for pointing this out.

OK. I'm going to push and backpatch if no objections.

------
Regards,
Alexander Korotkov
Supabase

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