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help / color / mirror / Atom feedFrom: Tom Lane <[email protected]>
To: Paul A Jungwirth <[email protected]>
Cc: Peter Eisentraut <[email protected]>
Cc: Aleksander Alekseev <[email protected]>
Cc: PostgreSQL Development <[email protected]>
Subject: Re: [PATCH] Fix null pointer dereference in PG19
Date: Tue, 07 Jul 2026 22:07:37 -0400
Message-ID: <[email protected]> (raw)
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Paul A Jungwirth <[email protected]> writes:
> On Tue, Apr 21, 2026 at 8:24 AM Tom Lane <[email protected]> wrote:
>> Checking this at parse time is completely the wrong thing.
>> The view could have gained (or lost) triggers by the time
>> it's executed.
> But INSTEAD OF triggers are selected in the rewriter, which uses the
> same relcache snapshot as parse analysis. And a concurrent change
> can't sneak in different triggers, because that causes a relcache
> invalidation, so we redo the parse & rewrite phases.
You have forgotten about views and rewrite rules. Those go to disk in
post-parser form, and will be rewritten only at execution sometime
later, *without* a re-parse.
regards, tom lane
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Subject: Re: [PATCH] Fix null pointer dereference in PG19
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