Skip site navigation (1) Skip section navigation (2)

Re: CREATE OPERATOR and precedence

From: Marc Cousin <cousinmarc(at)gmail(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pgsql-docs(at)postgresql(dot)org
Subject: Re: CREATE OPERATOR and precedence
Date: 2010-07-08 15:42:22
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-docs
The Thursday 08 July 2010 16:31:41, Tom Lane wrote :
> Marc Cousin <cousinmarc(at)gmail(dot)com> writes:
> > I just got caught by a precedence problem with CREATE OPERATOR.
> > 
> > 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.
> CREATE OPERATOR has nothing to say on the subject because operator
> precedences are hard-wired into the parser and can't be changed by
> 			regards, tom lane

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

From a technical point of view, I obviously totally agree, operators have no 
control over precedence, but I was only reporting this because I thought that 
it might be helpful to put something like a pointer to this table in the 

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

In response to


pgsql-docs by date

Next:From: Tom LaneDate: 2010-07-08 16:31:03
Subject: Re: CREATE OPERATOR and precedence
Previous:From: Daniele VarrazzoDate: 2010-07-08 14:54:54
Subject: Please provide stable target anchors

Privacy Policy | About PostgreSQL
Copyright © 1996-2017 The PostgreSQL Global Development Group