| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Jaime Casanova" <jcasanov(at)systemguards(dot)com(dot)ec> |
| Cc: | "Hitoshi Harada" <umi(dot)tanuki(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: TODO items for window functions |
| Date: | 2008-12-29 18:03:12 |
| Message-ID: | 9755.1230573792@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
"Jaime Casanova" <jcasanov(at)systemguards(dot)com(dot)ec> writes:
> i don't understand this window function stuff well yet, but AFAIU it
> is like an aggregate function that shows grouped values without
> grouping rows (ok, maybe a very laizy or novice definition) but if
> that is correct or near correct maybe we need to follow the same
> pattern:
> create function -- without any decoration
> create aggregate maybe with a decoration of being window o create
> window aggregate or something similar...
No, we can't really manage this as a variant of CREATE AGGREGATE
--- the information you need to specify to create a window function
is not at all like what you need to specify to create an aggregate.
regards, tom lane
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