Luke Lonergan wrote:
> Mark,
>
>
> It would be nice to put some tracers into the executor and see where the
> time is going. I'm also curious about the impact of the new 8.1 virtual
> tuples in reducing the executor overhead. In this case my bet's on the agg
> node itself, what do you think?
>
Yeah - it's pretty clear that the count aggregate is fairly expensive
wrt cpu - However, I am not sure if all agg nodes suffer this way (guess
we could try a trivial aggregate that does nothing for all tuples bar
the last and just reports the final value it sees).
Cheers
Mark
