| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, marcin mank <marcin(dot)mank(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Hash support for arrays |
| Date: | 2010-11-02 18:34:36 |
| Message-ID: | 1288722794-sup-9633@alvh.no-ip.org |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Excerpts from Tom Lane's message of mar nov 02 15:21:31 -0300 2010:
> What concerns me about that is that it tends to push the bits to the
> left --- I think the effects of the earlier inputs are going to overflow
> out as you incorporate a lot of newer inputs. What you want is a scheme
> where every input item affects all the bits of the final result about
> equally, and my gut feeling is this doesn't provide that.
Ahh, now I understand what you meant with "rotating" the bits in the
original email in this thread. You're not simply shifting. Clever.
--
Álvaro Herrera <alvherre(at)commandprompt(dot)com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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