| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
| Cc: | Hitoshi Harada <umi(dot)tanuki(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Window functions patch v04 for the September commit fest |
| Date: | 2008-09-03 08:17:16 |
| Message-ID: | 1220429836.4371.664.camel@ebony.2ndQuadrant |
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| Lists: | pgsql-hackers |
On Wed, 2008-09-03 at 09:51 +0300, Heikki Linnakangas wrote:
> Simon Riggs wrote:
> > On Tue, 2008-09-02 at 15:51 +0300, Heikki Linnakangas wrote:
> >
> >> The needs of access to the rows are so different that it seems best to
> >> me to delegate the buffering to the window function.
> >
> > That seems sensible in some ways, not others.
>
> In the API I proposed later in that mail, the buffering is actually done
> by the executor node, not by the window function. Instead, the window
> function can request abitrary rows of the frame from the executor, and
> can signal that some rows are no longer required, allowing them to be
> discarded.
I'm happy with that.
--
Simon Riggs www.2ndQuadrant.com
PostgreSQL Training, Services and Support
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