Re: COALESCE and NULLIF semantics

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: pgsql-hackers(at)postgresql(dot)org, "Sam Mason" <sam(at)samason(dot)me(dot)uk>
Subject: Re: COALESCE and NULLIF semantics
Date: 2009-09-11 18:10:44
Message-ID: 23591.1252692644@sss.pgh.pa.us
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"Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> writes:
> Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> It's what happens afterwards that's the problem --- try it and see.

> Anything in particular I should test or be looking for, or will the
> error of my ways be glaringly obvious on any usage?

I'm expecting coerce_type to fail, along the lines of
ERROR: failed to find conversion function from unknown to whatever

regards, tom lane

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