Re: Push predicate down in view containing window function

Ok so is there a way i can do something similar ? Would a function returning rows and taking the extra predicate 'values' as parameters be as optimized as the 'good' query in my first email ?

Thanks.

Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> a écrit :

Philippe Girolami <philippe(dot)girolami(at)sensorly(dot)com> writes:
> Hello,
> Using postgres 9.1.9, I have a view that uses a window function. I then query that view with a predicate on one of the columns. Unfortunately, the predicate doesn't get pushed down into the view.
> Given that the predicate applies to a column that's being partitionned on, why wouldn't the optimizer push the predicate down ?

Because there is zero optimization around window functions right now.
It certainly isn't smart enough to decide that it'd be safe to push
down a constraint that only mentions partitioning columns.

regards, tom lane