On Mon, Jan 30, 2023 at 10:34:20AM -0500, Bruce Momjian wrote:
> On Thu, Jan 26, 2023 at 11:06:41AM -0500, Tom Lane wrote:
> > I don't know anything about the mysql FDW, but another possible route
> > to fixing things is to get it to not believe that the remote's sort
> > ordering matches the local one. If the plan were relying on a local
> > sort instead of a remote sort then everything would be fine.
>
> When we implemented sort pushdown to FDWs I had not considered how hard
> it might be to match sort ordering, especially considering the problem
> we have in matching orderings from different operating system versions.
>
> Is this documented somewhere?
The attached patch documents this remote sort order requirement.
--
Bruce Momjian <bruce@momjian.us> https://momjian.us
EDB https://enterprisedb.com
Only you can decide what is important to you.