| From: | Simon Riggs <simon(at)2ndQuadrant(dot)com> |
|---|---|
| To: | David Rowley <dgrowleyml(at)gmail(dot)com> |
| Cc: | Kouhei Kaigai <kaigai(at)ak(dot)jp(dot)nec(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: using custom scan nodes to prototype parallel sequential scan |
| Date: | 2014-11-14 09:32:53 |
| Message-ID: | CA+U5nMLqOy9FxXD1=K+ek+urkOY0U1HCGiHJc-RZxfUGLdopGA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 14 November 2014 01:51, David Rowley <dgrowleyml(at)gmail(dot)com> wrote:
> When I mentioned this, I didn't mean to appear to be placing a road block.I
> was just bringing to the table the information that COUNT(*) + COUNT(*)
> works ok for merging COUNT(*)'s "sub totals", but AVG(n) + AVG(n) does not.
>
> Merge functions should be a simple patch to write. If I thought there was
> going to be a use for them in this release, I'd put my hand up to put a
> patch together.
The hard part is describing and then agreeing the semantics.
If you raise a separate post on this, copy me in and I will help.
--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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