Date: Sat, 2 Oct 2004 15:04:51 -0500
From: Bruno Wolff III <bruno@wolff.to>
To: Gaetano Mendola <mendola@bigfoot.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>, pgsql-hackers@postgresql.org
Subject: Re: Mislabeled timestamp functions (was Re: [SQL] [NOVICE]
	date_trunc'd
Message-ID: <20041002200451.GA14830@wolff.to>
Mail-Followup-To: Gaetano Mendola <mendola@bigfoot.com>,
	Tom Lane <tgl@sss.pgh.pa.us>, pgsql-hackers@postgresql.org
References: <web-1583353@davinci.ethosmedia.com>
	<Pine.GSO.4.10.10409271910480.22691-100000@solarwind>
	<20041001182830.GA20624@wolff.to> <13492.1096656574@sss.pgh.pa.us>
	<15677.1096671183@sss.pgh.pa.us> <415E6A15.1090105@bigfoot.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <415E6A15.1090105@bigfoot.com>
User-Agent: Mutt/1.5.6i

On Sat, Oct 02, 2004 at 10:43:01 +0200,
  Gaetano Mendola <mendola@bigfoot.com> wrote:
> Tom Lane wrote:
> >I wrote:
> >Do you see any other mislabelings?
> 
> I don't but I think that the concept of immutable shall be expanded.
> I mean I can use safely a date_trunc immutable in a query ( I think this
> is a sort of "immutable per statement" ) but not in a index definition
> ( the index mantainance is affected by the current timezonesettings ).
> So may be another modifier shall be introduced that reflect the "immutable
> per statement"

There has been such a distinction for a major release or two. "Stable"
is how you mark a function that will return the same value within a
single transaction.