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Re: [8.4] Updated WITH clause patch (non-recursive)

From: "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com>
To: "Neil Conway" <neilc(at)samurai(dot)com>
Cc: "Gregory Stark" <stark(at)enterprisedb(dot)com>, pgsql-patches <pgsql-patches(at)postgresql(dot)org>
Subject: Re: [8.4] Updated WITH clause patch (non-recursive)
Date: 2008-01-27 10:30:32
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-patches

On 27/01/2008, Neil Conway <neilc(at)samurai(dot)com> wrote:
> On Sun, 2008-01-27 at 09:17 +0000, Gregory Stark wrote:
> > Tom's feeling at the time was that even though it was providing something from
> > the standard, it wasn't actually allowing the user to do anything he couldn't
> > before.
> I think this feature has value:


I thing so is better commit smaller pieces more often than one time
one big patch. Nine months long feature freeze time is enough.

Pavel Stehule

> (1) This is SQL-standard syntax (and not even wacko syntax, at that!),
> and there is merit in implementing it on those grounds alone.
> (2) It is supported by DB2, MS SQL and Oracle, so there is a further
> compatibility argument to be made.
> (3) It avoids the need to repeat subqueries multiple times in the main
> query, which can make queries more concise. Defining subqueries outside
> the main SELECT body can also have readability advantages.
> > If it doesn't provide any additional expressive capabilities then I
> > think he didn't like taking "with" as a reserved word.
> Note that we can make WITH a type_func_name_keyword, rather than a
> full-on reserved_keyword, which reduces the force of this argument
> slightly.
> If we're going to implement recursive queries eventually (which we
> almost surely will, whether in 8.4 or a future release), we'll need to
> make WITH more reserved at some point anyway, so I don't see much to be
> gained in the long run by delaying it.
> -Neil
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