From: Tom Lane <tgl@sss.pgh.pa.us>
To: Randall Lucas <rlucas@tercent.net>
Cc: Rod Taylor <rbt@rbt.ca>
Cc: pgsql-sql@postgresql.org
Subject: Re: merge-join for domain with underlying type text
Date: Sat, 10 May 2003 23:19:49 -0400
Message-ID: <10881.1052623189@sss.pgh.pa.us> (raw)
In-Reply-To: <F6870A5A-834A-11D7-B164-000A957653D6@tercent.net>
References: <F6870A5A-834A-11D7-B164-000A957653D6@tercent.net>
Randall Lucas <rlucas@tercent.net> writes:
> Hackers, why is this? It seems to me that since everything else (or
> everything I've run into so far, up to the full outer joins) is
> implicitly the same for a simple domain and its underlying base type,
> that it would make sense if this, too, Just Worked.
It does Just Work ... in CVS tip. I can't make it magically work in
7.3 --- at least not without back-patching a lot of stuff that hasn't
been through beta-testing yet.
The problem is that mergejoin in existing releases will only work on
plain "Var = Var" clauses. Your domain case doesn't look like that
because of the runtime cast operators.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, rlucas@tercent.net, rbt@rbt.ca
Subject: Re: merge-join for domain with underlying type text
In-Reply-To: <10881.1052623189@sss.pgh.pa.us>
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