Greg,
> this despite PostgreSQL happily accepting:
> GRANT REFERENCES ON pg_namespace TO greg;
We should probably error out on this.
> I found the change in tablecmds.c and a mention of it in PostgreSQL
> Weekly News - May 17 2009, yet I don't understand why referencing
> a system table in this manner should be a problem - is it?
System tables have special properties which can make modifications to
them behave non-transactionally. So it's never safe to have a trigger
on a system table. I'm frankly surprised that this worked for you before.
> I'm trying to have certain rows of my tables go away if certain
> schemas are dropped. Is there a preferred way to do this?
I can't off the top of my head think of a "preferred way".
> If this regression is retained, it needs to be documented in the
> reference manual AND I think that an attempt to GRANT REFERENCES
> privileges to a system table should not be allowed.
I agree that GRANT REFERENCES should error. Do you have a suggestion
where in the manual would be a good place to warn people that FKs
against the system tables are a bad idea?
--
Josh Berkus
PostgreSQL Experts Inc.
www.pgexperts.com
