Re: Why does exec_simple_query requires 2 snapshots

Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:

> 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

Commit id is 532994299e2, thank you Tom!

--
Best Regards
Andy Fan