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* Re: CREATE OPERATOR and precedence
@ 2010-07-08 15:42 Marc Cousin <cousinmarc@gmail.com>
0 siblings, 1 reply; 2+ messages in thread
From: Marc Cousin @ 2010-07-08 15:42 UTC (permalink / raw)
To: Tom Lane <tgl@sss.pgh.pa.us>; +Cc: pgsql-docs
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.
> >
> > 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
> CREATE OPERATOR. See
>
> http://www.postgresql.org/docs/8.4/static/sql-syntax-lexical.html#SQL-PRECE
> DENCE
>
> 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
CREATE OPERATOR doc.
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.
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: CREATE OPERATOR and precedence
@ 2010-07-08 16:31 Tom Lane <tgl@sss.pgh.pa.us>
parent: Marc Cousin <cousinmarc@gmail.com>
0 siblings, 0 replies; 2+ messages in thread
From: Tom Lane @ 2010-07-08 16:31 UTC (permalink / raw)
To: Marc Cousin <cousinmarc@gmail.com>; +Cc: pgsql-docs
Marc Cousin <cousinmarc@gmail.com> writes:
> 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 CREATE OPERATOR doc.
Oh, that's a reasonable idea. Done in HEAD.
regards, tom lane
^ permalink raw reply [nested|flat] 2+ messages in thread
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2010-07-08 15:42 Re: CREATE OPERATOR and precedence Marc Cousin <cousinmarc@gmail.com>
2010-07-08 16:31 ` Tom Lane <tgl@sss.pgh.pa.us>
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