Yep, exacly. One time from 2^32 we reset whole cache instead of one (or several) entry with hash value = 0.

On 08.03.2024 18:35, Tom Lane wrote:
Aleksander Alekseev <aleksan...@timescale.com> writes:
One thing that I couldn't immediately figure out is why 0 hash value
is treated as a magic invalid value in TypeCacheTypCallback():

I've not read this patch, but IIRC in some places we have a convention
that hash value zero is passed for an sinval reset event (that is,
"flush all cache entries").

                        regards, tom lane



--
Teodor Sigaev                                   E-mail: teo...@sigaev.ru
                                                   WWW: http://www.sigaev.ru/


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