Re: Locks on temp table and PREPARE

Tom Lane wrote:
> True, but the problem is that the tuple might still be live to (some
> snapshots in) that transaction, so we can't inject a duplicate tuple
> without risking confusing it. In this particular case that isn't an
> issue because the transaction is done executing, but the tqual.c
> rules don't know that.
>
Please excuse my ignorance. I am not sure to get how the tuple could
still be live to some snapshots after the transaction has prepared. What
could still happen to objects that were only visible to a transaction
after it has prepared? An example would definitely help.
Is it possible in Postgres for a transaction to see an object that was
created inside another transaction before it commits (assuming at least
'read committed' of course)?

Thanks again,
Emmanuel