Re: Feature proposal: generalizing deferred trigger events

Holger Krug <hkrug@rationalizer.com> writes:
> The proposal consists in generalizing the PostgreSQL deferred trigger
> mechanism to more general types of events.

While I have no inherent objection to that, I'm not seeing what it's
good for either.  What SQL feature would be associated with this?

> One use case would be a PostgreSQL procedure `mark_tx_rollback()' to
> mark a transaction for rollback.

This is unconvincing, since Postgres has no need for rollback procedures
(and I personally will disagree with any attempt to introduce 'em; if
you need one then you have a problem doing crash recovery).
        regards, tom lane