Re: [HACKERS] postgres_fdw: Add support for INSERT OVERRIDING clause

On Wed, Nov 29, 2017 at 8:12 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> IIRC, this issue was debated at great length back when we first put
> in foreign tables, because early drafts of postgres_fdw did what you
> propose here, and we ran into very nasty problems. We eventually decided
> that allowing remotely-determined column defaults was a can of worms we
> didn't want to open. I do not think that GENERATED columns really change
> anything about that. They certainly don't do anything to resolve the
> problems we were contending with back then. (Which I don't recall the
> details of; you'll need to trawl the archives. Should be somewhere early
> in 2013, though, since we implemented that change in commit 50c19fc76.)

So this gives a good reason to do nothing or return an error at
postgres_fdw level for OVERRIDING?
--
Michael