| From: | "David E(dot) Wheeler" <david(at)justatheory(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Peter Geoghegan <peter(at)2ndquadrant(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Exclusion Constraints on Arrays? |
| Date: | 2012-05-23 17:38:33 |
| Message-ID: | 53A5174B-13D6-411B-9F5A-1EEF312D2EE2@justatheory.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On May 23, 2012, at 10:35 AM, Robert Haas wrote:
>> "Exclusion constraints generalize uniqueness constraints by allowing
>> arbitrary comparison operators, not just equality....This is useful
>> for time periods and other ranges, as well as arrays."
>
> I objected to it at the time, but lost the argument.
It does rather seem to be a mistake to say that they can be used with arrays when they cannot. Or can they in some other way I haven’t noticed?
David
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