Re: Faulty HEAP_XMAX_LOCK_ONLY & HEAP_KEYS_UPDATED hintbit combination

On 2021-Feb-05, Julien Rouhaud wrote:

> Thanks, that's way better, copied in v3.  I'm still a bit worried about that
> description though, as that flag isn't consistently set for the FOR UPDATE
> case.  Well, to be more precise it's maybe consistently set when the hint bits
> are computed, but in some cases the flag is later cleared, so you won't
> reliably find it in the tuple.

Hmm, that sounds bogus.  I think the resetting of the other bits should
be undone afterwards, but I'm not sure that we correctly set
KEYS_UPDATED again after the TOAST business.  (What stuff does, from
memory, is to make the tuple look as if it is fully updated, which is
necessary during the TOAST handling; if the bits are not correctly set
transiently, that's okay.  But it needs reinstated again later, once the
TOAST stuff is finished).

-- 
Álvaro Herrera                            39°49'30"S 73°17'W
"El número de instalaciones de UNIX se ha elevado a 10,
y se espera que este número aumente" (UPM, 1972)