| From: | David Rowley <dgrowleyml(at)gmail(dot)com> |
|---|---|
| To: | Simon Riggs <simon(at)2ndquadrant(dot)com> |
| Cc: | 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 11:42:59 |
| Message-ID: | CAApHDvr2Nx+tHW+YBR1ON+Qp87eros0nN5skNwiHBy21GJSvgA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Nov 14, 2014 at 1:27 PM, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> On 12 November 2014 00:54, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> > Interestingly, I have a fairly solid idea of what proisparallel is,
> > but I have no clear idea what CONTAINS NO SQL is or why it's relevant.
> > I would imagine that srandom() contains no SQL under any reasonable
> > definition of what that means, but it ain't parallel-safe.
>
> What is wrong in generating random numbers in parallel?
>
I was just watching Robert's talk on Parallel query on youtube... I think
the answer is at 41:09, the link below should take you there:
https://www.youtube.com/watch?v=3klfarKEtMQ#t=2469
Regards
David Rowley
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