Alvaro Herrera <alvhe...@commandprompt.com> writes: > Actually this seems rather difficult to do, because in order to invoke > the function that imports the snapshot, you have to call SELECT, which > acquires a snapshot beforehand. So when we actually import the > passed-in snapshot, there's already a snapshot set. This is odious but > I don't see a way around that -- other than adding special grammar > support which seems overkill.
No, I don't think it is. The alternative is semantics that are at least exceedingly ugly, and very possibly flat-out broken. To take just one point, you have no way at all of preventing the transaction from having done something else using its original snapshot. regards, tom lane -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers