#26602: RawSQL window functions break count()
-------------------------------------+-------------------------------------
Reporter: daggaz | Owner: nobody
Type: Uncategorized | Status: new
Component: Database layer | Version: master
(models, ORM) |
Severity: Normal | Resolution:
Keywords: QuerySet.extra | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by akaariai):
I guess we could add Window annotations. The problem is that you can't
actually filter on window functions, you need a subquery for that. That
is:
{{{
select SUM(amount) OVER (ORDER BY created) as sum_amount
from ...
where sum_amount > 0
}}}
is illegal SQL. We'd need to write the query as:
{{{
select * from (select SUM(amount) OVER (ORDER BY created) as sum_amount
from ...) subq
where sum_amount > 0
}}}
I don't think we have machinery to do that easily right now.
I'm OK adding window aggregates to Django if they fail loudly and clearly
when one tries to filter over them. They could be useful even if you can't
actually filter on the result.
Maybe a new ticket is better for this than hijacking this ticket?
--
Ticket URL: <https://code.djangoproject.com/ticket/26602#comment:4>
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