Re: Support for 8-byte TOAST values (aka the TOAST infinite loop problem) - Mailing list pgsql-hackers

On Fri, Aug 01, 2025 at 06:03:11PM +0900, Michael Paquier wrote:
> Please find attached a v3, that I have spent some time polishing to
> fix the value ID problem of this thread.  v2 had some conflicts, and
> the CI previously failed with warning job (CI is green here now).

Attached is a v4, due to conflicts mainly caused by the recent changes
in varatt.h done by e035863c9a04.  This had an interesting side
benefit when rebasing, where I have been able to isolate most of the
knowledge related to the struct varatt_external (well
varatt_external_oid in the patch set) into toast_external.c, at the
exception of VARTAG_SIZE.  That's done in a separate patch, numbered
0006.

The rest of the patch set has a couple of adjustements to document
better the new API expectations for toast_external.{c,h}, comment
adjustments, some more beautification changes, some indentation
applied, etc.

> As things stand, I am getting pretty happy with the patch set up to
> 0005 and how things are getting in shape for the interface, and I am
> planning to begin applying this stuff up to 0005 in the next couple of
> weeks.

As of this patch set, this means a new target of 0006, to get the
TOAST code refactored so as it is able to support more than 1 type of
external on-disk pointer with the 8-byte value problem in scope.  Any
comments?
--
Michael