Andy Fan <zhihuifan1213(at)163(dot)com> writes:
> My question is why can't we share the same snapshot for the 2 cases?
> parser & planner requires Catalog Snapshot which should be the
> latest one, but in the above case, looks the executor can reuse it as
> well. Is there anything I missed?
Many years ago, we committed a patch to do exactly that. We had
to back it out again because it broke too many real-world scenarios.
I'm too lazy to search the archives for you, but you might be able
to find the commit and revert by searching the git history.
regards, tom lane