On 03/11/2014 11:06 PM, Tom Lane wrote:
Andrew Dunstan <and...@dunslane.net> writes:
On 03/11/2014 09:37 PM, Tom Lane wrote:
In particular, I'd like to see an exclusion that prevents local users
from having the same name as any global user, so that we don't have
ambiguity in GRANT and similar commands.  This doesn't seem simple to
enforce (if we supported partial indexes on system catalogs, it would
be ...) but surely this representation is more amenable to enforcing it
than the existing one.
Should be workable if you're creating a local name - just check against
the list of global roles.
Concurrent creations won't be safe without some sort of locking scheme.
A unique index would be a lot better way of plugging that hole than a
system-wide lock on user creation.  But not sure how to define a unique
index that allows (joe, db1) to coexist with (joe, db2) but not with
(joe, 0).


Create (joe, db1), (joe, db2) ... for each global user? Might get a tad ugly if you have lots of global users or lots of databases.

Just trying to be a bit creative :-)



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