Japin Li <japinli(at)hotmail(dot)com> writes:
> IIRC, AtSubStart_Memory, AtSubStart_ResourceOwner and AfterTriggerBeginSubXact don't
> use s->state.
No, they don't.
> Why should we set s->state to TRANS_START and then TRANS_INPROGRESS?
I believe it's so that if an error gets thrown somewhere in that
area, we'll recover properly. I'd be the first to say that this
stuff isn't terribly well-tested, since it's hard to force an
error there.
regards, tom lane