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help / color / mirror / Atom feedFrom: David Rowley <[email protected]>
To: Tender Wang <[email protected]>
Cc: Andres Freund <[email protected]>
Cc: John Naylor <[email protected]>
Cc: PostgreSQL Developers <[email protected]>
Subject: Re: More speedups for tuple deformation
Date: Fri, 20 Mar 2026 01:56:38 +1300
Message-ID: <CAApHDvo-5T5Wn1nxUhOsjtYvAbmUPaFpxyLePtyG+6O5hxOb4w@mail.gmail.com> (raw)
In-Reply-To: <CAHewXNmSK+gKziAt_WvQoMVWt3_LRVMmRYY9dAbMPMcpPV0QmA@mail.gmail.com>
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On Fri, 20 Mar 2026, 01:39 Tender Wang, <[email protected]> wrote:
> Hi David,
>
> David Rowley <[email protected]> 于2026年3月17日周二 05:15写道：
> >
> > On Mon, 16 Mar 2026 at 22:17, David Rowley <[email protected]> wrote:
> > >
> > > On Mon, 16 Mar 2026 at 20:01, Tender Wang <[email protected]> wrote:
> postgres=# update public.region set
> r_comment = public.region.r_comment
> returning
> 5 as c0,
> pg_catalog.bittypmodout(
> cast(public.region.r_regionkey as int4)) as c1;
> server closed the connection unexpectedly
> This probably means the server terminated abnormally
> before or while processing the request.
> The connection to the server was lost. Attempting reset: Succeeded.
>
> (gdb) bt
> 1197 pg_assume(attlen > 0 || attlen == -1);
> (gdb) p attlen
> $1 = -2
>
Thanks for the report. I'll look in detail in the morning when I'm at my
computer again. I guess i'll need to add an extra parameter (that will be
constant folded away during the inlining) to the deformed function to
specify if cstrings can exist in the tuple, which seemingly needs to be
true when deforming minimal tuples. I'd rather not lose that optimisation
with heap tuples.
David
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Subject: Re: More speedups for tuple deformation
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