Re: Why overhead of SPI is so large?

čt 21. 11. 2019 v 20:44 odesílatel Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> napsal:

> Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
> > čt 21. 11. 2019 v 10:31 odesílatel Konstantin Knizhnik <
> > k(dot)knizhnik(at)postgrespro(dot)ru> napsal:
> >> With contain_mutable_functions the patch becomes trivial.
>
> > Stable functions doesn't need own snapshot too, so it is not fully
> correct,
> > but it is on safe side.
>
> No, I doubt that. A stable function is allowed to inspect database state,
> and if it's being called by a volatile function, it has every right to
> expect that it'd see updates-so-far made by the volatile function.
>

for this I need new snapshot?

> regards, tom lane
>