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From: Tom Lane <[email protected]>
To: Andrew Dunstan <[email protected]>
Cc: [email protected]
Subject: Re: Can we remove support for standard_conforming_strings = off yet?
Date: Wed, 31 Dec 2025 12:04:41 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
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Andrew Dunstan <[email protected]> writes:
> On 2025-12-30 Tu 5:50 PM, Tom Lane wrote:
>> As I was working through it, I realized that there's one
>> potentially-nasty point that might cause upgrading problems.
>> To wit, pg_dump and pg_dumpall have historically replicated the
>> source server's standard_conforming_strings setting into their
>> output: they emit a SET command for that, and any string literals
>> appearing in views or the like will be escaped accordingly.
>> So if your old installation had standard_conforming_strings = off,
>> and all you have from it is existing pg_dump output (either text
>> or archive format), you are in a sticky situation because that
>> dump will not restore cleanly.

> Have we ever promised that dumps made using pg_dump/pg_dumpall from 
> other than the target version work?

We may not promise it, but I think we've always tried very hard to
not break old pg_dump files, precisely because they might be the only
available backup.

> I don't see this as a big issue, unless I'm misunderstanding.

Personally I would call it a deal-breaker if I thought it'd affect
more than a very very tiny number of people.  But the entire premise
of this patch is that nobody is using standard_conforming_strings =
off in production anymore.  If that isn't true it's probably a
mistake to go forward anyway.

			regards, tom lane

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