DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma;
	h=from:to:subject:date:user-agent:cc:references:in-reply-to
	:mime-version:content-type:content-transfer-encoding:message-id;
	b=W43m0+z7QlQsComUes2GspbMZcHF+fKitA/Irbjp88V+3CqNia5K0tOTndwYTzl1OI
	8qsq7ycPc69DZWeaBS3rR8YxtPXOYY1RHw7CTv2YYHeoU9D5kpQoeBQyelQ2wC9zooOZ
	SO/IcgrnHKUFCe0xFVPSAfsNNDrPMBVjWo/O8=
From: Marc Cousin <cousinmarc@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Subject: Re: =?iso-8859-6?q?CREATE=A0OPERATOR_and?= precedence
Date: Thu, 8 Jul 2010 17:42:22 +0200
User-Agent: KMail/1.13.5 (Linux/2.6.34-ARCH; KDE/4.4.5; x86_64; ; )
Cc: pgsql-docs@postgresql.org
References: <201007081628.30860.cousinmarc@gmail.com>
	<24641.1278599501@sss.pgh.pa.us>
In-Reply-To: <24641.1278599501@sss.pgh.pa.us>
MIME-Version: 1.0
Content-Type: Text/Plain;
  charset="iso-8859-6"
Content-Transfer-Encoding: quoted-printable
Message-Id: <201007081742.22830.cousinmarc@gmail.com>

The Thursday 08 July 2010 16:31:41, Tom Lane wrote :
> Marc Cousin <cousinmarc@gmail.com> writes:
> > I just got caught by a precedence problem with CREATE OPERATOR.
> >=20
> > Obviously, it was mostly my fault (I didn't think of the precedence of =
my
> > operator at all), but I didn't find anything in the CREATE OPERATOR
> > documentation about it either.
>=20
> CREATE OPERATOR has nothing to say on the subject because operator
> precedences are hard-wired into the parser and can't be changed by
> CREATE OPERATOR.  See
>=20
> http://www.postgresql.org/docs/8.4/static/sql-syntax-lexical.html#SQL-PRE=
CE
> DENCE
>=20
> 			regards, tom lane

Yes, that's what I found out, afterwards.

=46rom a technical point of view, I obviously totally agree, operators have=
 no=20
control over precedence, but I was only reporting this because I thought th=
at=20
it might be helpful to put something like a pointer to this table in the=20
CREATE OPERATOR doc.

=46rom the user's point of view, even if precedence is hard-wired in the pa=
rser,=20
a note about it could help here, if only as a reminder. The first thing I=20
thought when facing the problem was : "how do I specify the precedence ?". =
I=20
found out I couldn't, but a pointer or a note would have been even easier.