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@xxxxxxxxxxxxx> a écrit :
Philippe Girolami <philippe.girolami@xxxxxxxxxxxx> 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
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