From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Andres Freund <andres@anarazel.de>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-hackers@postgresql.org
Subject: Re: Implement targetlist SRFs using ROWS FROM() (was Changed SRF in targetlist handling)
Date: Mon, 16 Jan 2017 18:33:30 -0300
Message-ID: <20170116213330.xfbagqmxfp5bgguo@alvherre.pgsql> (raw)
In-Reply-To: <20170116210019.a3glfwspg5lnfrnm@alap3.anarazel.de>
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Andres Freund wrote:
> On 2017-01-16 16:04:34 -0300, Alvaro Herrera wrote:
> > Andres Freund wrote:
> > > On 2017-01-16 12:17:46 -0300, Alvaro Herrera wrote:
> > > > Hmm. I wonder if your stuff could be used as support code for
> > > > XMLTABLE[1].
> > >
> > > I don't immediately see what functionality overlaps, could you expand on
> > > that?
> >
> > Well, I haven't read any previous patches in this area, but the xmltable
> > patch adds a new way of handling set-returning expressions, so it
> > appears vaguely related.
>
> Ugh. That's not good - I'm about to remove isDone. Like completely.
> That's why I'm actually working on all this, because random expressions
> returning more rows makes optimizing expression evaluation a lot harder.
Argh.
> > These aren't properly functions in the current sense of the word,
> > though.
>
> Why aren't they? Looks like it'd be doable to do so, at least below the
> parser level?
Hmm ...
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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To: pgsql-hackers@postgresql.org
Cc: alvherre@2ndquadrant.com, andres@anarazel.de, tgl@sss.pgh.pa.us
Subject: Re: Implement targetlist SRFs using ROWS FROM() (was Changed SRF in targetlist handling)
In-Reply-To: <20170116213330.xfbagqmxfp5bgguo@alvherre.pgsql>
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