Re: someone working to add merge?

From: Peter Eisentraut <peter_e(at)gmx(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-hackers(at)postgresql(dot)org, Josh Berkus <josh(at)agliodbs(dot)com>, Jaime Casanova <systemguards(at)gmail(dot)com>
Subject: Re: someone working to add merge?
Date: 2005-11-11 19:04:35
Message-ID: 200511112004.35876.peter_e@gmx.net
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Tom Lane wrote:
> Surely they require a unique constraint --- else the behavior isn't
> even well defined, is it?

They require that the merge condition does not match for more than one
row, but since the merge condition can do just about anything, there is
no guarantee that a unique constraint encompasses it.

--
Peter Eisentraut
http://developer.postgresql.org/~petere/

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