On Sat, Jan 11, 2014 at 2:47 AM, Peter Eisentraut <peter_e@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,
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Fabrízio de Royes Mello Consultoria/Coaching PostgreSQL