Re: Better error message for select_common_type()

From: Peter Eisentraut <peter_e(at)gmx(dot)net>
To: Gregory Stark <stark(at)enterprisedb(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Better error message for select_common_type()
Date: 2007-04-23 22:11:29
Message-ID: 200704240011.30528.peter_e@gmx.net
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Gregory Stark wrote:
> "Peter Eisentraut" <peter_e(at)gmx(dot)net> writes:
> > peter=# values(0,1), (1::bigint,2), ('text'::text,3);
> > ERROR: 42804: VALUES types bigint at position 2 and text at
> > position 3 cannot be matched in instance 1
> >
> > I'm not sure about the terminology "position" and "instance";
> > they're just two coordinates to get at the problem.
>
> Wouldn't that just be column 1 in rows 2 and 3?

In this case yes, but the routine is also used for UNION, IN, GREATEST,
JOIN/USING and others.

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

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