On 2024-06-25 14:35:00 -0400, Robert Haas wrote: > Is there any way that we could instead tweak things so that we adjust > the visibility test object itself? Like can have a GlobalVisTest API > where we can supply the OldestXmin from the VacuumCutoffs and have it > ... do something useful with that?
I doubt that's doable in the back branches. And even on HEAD, I don't think it's a particularly attractive option - there's just a global vistest for each of the types of objects with a specific horizon (they need to be updated occasionally, e.g. when taking snapshots). So there's not really a spot to put an associated OldestXmin. We could put it there and remove it at the end of vacuum / in an exception handler, but that seems substantially worse.
