Обсуждение: Re: [HACKERS] Roadmap for FE/BE protocol redesign

On Tue, 2003-03-11 at 09:18, Merlin Moncure wrote:
> > If the backend can not handle the version I request, but can handle a
> > prior version, I'd like to know.  I am planning on having handlers for
> > multiple protocol versions in the same memory space (I'm using
> > Smalltalk, BTW) so that one application can talk to various databases
> of
> > various vintages.
> > 
> how about a system table, say pg_features which can be queried by the fe
> interface?  This could be a table of bools with named features and/or
> other little widgets for compatibility.  No protocol modification
> required, unless the scope of the protocol change is such that you can't
> execute a connection and a query.

But wouldn't you have to connect to get this information?  Surely this
is a catch 22.