Re: Request for comment on setting binary format output per session - Mailing list pgsql-hackers

On Mon, Oct 9, 2023 at 11:09 AM Jelte Fennema <postgres@jeltef.nl> wrote:
> Since the protocol already returns OIDs in the ParameterDescription
> and RowDescription messages I don't see why using OIDs for this GUC
> would cause any additional problems.

...but then...

> With Citus the same user defined type can have
> different OIDs on each of the servers in the cluster.

I realize that your intention here may be to say that this is not an
*additional* problem but one we have already. But it seems like one
that we ought to be trying to solve, rather than propagating a
problematic solution into more places.

Decisions we make about the wire protocol are some of the most
long-lasting and painful decisions we make, right up there with the
on-disk format. Maybe worse, in some ways.

--
Robert Haas
EDB: http://www.enterprisedb.com