Re: BUG #4275: Multicolumn subquery expression not allowed on both sides of IS DISTINCT FROM

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Carl-Daniel Hailfinger" <c-d(dot)hailfinger(dot)devel(dot)2006(at)gmx(dot)net>
Cc: pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #4275: Multicolumn subquery expression not allowed on both sides of IS DISTINCT FROM
Date: 2008-07-01 14:32:36
Message-ID: 3563.1214922756@sss.pgh.pa.us
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"Carl-Daniel Hailfinger" <c-d(dot)hailfinger(dot)devel(dot)2006(at)gmx(dot)net> writes:
> This works:
> # SELECT ROW(true,true)=(SELECT true,true);

> This doesn't:
> # SELECT (SELECT true,true)=(SELECT true,true);
> Error: 42601: subquery must return only one column

This is not a bug, since we do not claim support for feature F641.

regards, tom lane

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