| From: | Petr Jelinek <petr(at)2ndquadrant(dot)com> |
|---|---|
| To: | Atri Sharma <atri(dot)jiit(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | KaiGai Kohei <kaigai(at)ak(dot)jp(dot)nec(dot)com>, David Rowley <dgrowleyml(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Amit Kapila <amit(dot)kapila(at)enterprisedb(dot)com> |
| Subject: | Re: Combining Aggregates |
| Date: | 2014-12-17 10:17:04 |
| Message-ID: | 54915820.4020106@2ndquadrant.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On 17/12/14 11:02, Atri Sharma wrote:
>
>
> On Wed, Dec 17, 2014 at 3:23 PM, Simon Riggs <simon(at)2ndquadrant(dot)com
> <mailto:simon(at)2ndquadrant(dot)com>> wrote:
>
> KaiGai, David Rowley and myself have all made mention of various ways
> we could optimize aggregates.
>
> Following WIP patch adds an extra function called a "combining
> function", that is intended to allow the user to specify a
> semantically correct way of breaking down an aggregate into multiple
> steps.
>
>
> Also, should we not have a sanity check for the user function provided?
Looking at the code, yes, there seems to be XXX comment about that.
--
Petr Jelinek http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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