| From: | Peter Geoghegan <peter(at)2ndquadrant(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | "David E(dot) Wheeler" <david(at)justatheory(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Exclusion Constraints on Arrays? |
| Date: | 2012-05-23 17:34:01 |
| Message-ID: | CAEYLb_VDAcedms-hvUpCLWq94P+omNnL_K+3YMv6j_0=v-81YA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 13 May 2012 23:45, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> Hmm, it looks like GIN can't support exclusive constraints because
> amgettuple support is required, and unfortunately that got remove for
> GIN in this commit:
>
> commit ff301d6e690bb5581502ea3d8591a1600fd87acc
That seems very unfortunate, given that the 9.0 release notes say:
"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."
--
Peter Geoghegan http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training and Services
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