On Sat, Jan 11, 2014 at 2:47 AM, Peter Eisentraut <pete...@gmx.net> wrote: > > On Sat, 2014-01-11 at 00:48 -0200, Fabrízio de Royes Mello wrote: > > > Now, if bdr is installed but the validation doesn't happen unless > > bdr > > > is "loaded" in some sense, then that is an implementation deficiency > > > that I think we can insist be rectified before this feature is > > accepted. > > > > > > Check if extension is already installed is not enough for the first > > version of this feature? > > Elsewhere it was argued that tying this to extensions is not > appropriate. I agree. > > It depends on how this feature is supposed to be used exactly. A > replication plugin might very well be loaded via > session_preload_libraries and not appear in SQL at all. In that case > you need some C-level hook. In another case, an extension might want to > inspect relation options from user-space triggers. So you'd need to > register some SQL-level function for option validation. > > This could end up being two separate but overlapping features. >
Hi all, I taken this weekend to work on this patch and on monday or tuesday I'll send it. But I have some doubts: 1) I'm not convinced to tying this to extensions. I think this feature must enable us to just store a custom GUC. We can set custom GUCs in a backend session using "SET class.variable = value", and this feature could just enable us to store it for relations/attributes. Without the complexity and overhead to register a function to validate them. That way we can use this feature to extensions and other needs too. 2) If we're implement the Robert's idea to have a function to validate the extension options then we must think about how a extension developer will register this function. Beacuse when we install a extension must have one way to get de pg_proc OID and store it in the pg_extension (or a different catalog). Or we'll implement some way to register this function at the SQL level, like "ALTER EXTENSION bdr SET VALIDATE FUNCTION bdr_options_validate();" or another sintax of course. I don't know if you guys understood my concerns!! :-) Comments? Regards, -- Fabrízio de Royes Mello Consultoria/Coaching PostgreSQL >> Timbira: http://www.timbira.com.br >> Blog sobre TI: http://fabriziomello.blogspot.com >> Perfil Linkedin: http://br.linkedin.com/in/fabriziomello >> Twitter: http://twitter.com/fabriziomello
