| From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> |
| Cc: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Craig Ringer <craig(dot)ringer(at)2ndquadrant(dot)com>, Joe Conway <mail(at)joeconway(dot)com>, Mario Becroft <mb(at)true(dot)group>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Ilya Shkuratov <motr(dot)ilya(at)ya(dot)ru>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Gavin Flower <GavinFlower(at)archidevsys(dot)co(dot)nz>, Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com>, Serge Rielau <serge(at)rielau(dot)com> |
| Subject: | Re: CTE inlining |
| Date: | 2017-05-09 19:22:54 |
| Message-ID: | CAKFQuwaOxwMMqOEgG0BxquW_nnFf=+NB-RGAFb4_YNtbFJQqMw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, May 9, 2017 at 12:15 PM, Peter Eisentraut <
peter(dot)eisentraut(at)2ndquadrant(dot)com> wrote:
> On 5/5/17 08:43, David Rowley wrote:
> > How about we get the ball rolling on this in v10 and pull that part
> > out of the docs. If anything that'll buy us a bit more wiggle room to
> > change this in v11.
> >
> > I've attached a proposed patch.
>
> If we just tell them that the thing they might have relied on might go
> away, without a replacement to suggest, then we're just confusing and
> scaring them, no?
>
We'd end up suggesting our OFFSET 0 hack as true protection. If they know
for a fact that their use of CTE for its barrier properties is not
supported they are also more likely to document intentional usage with
something like: "-- CHANGE THIS ONCE VERSION 11 IS RELEASED!!! --" which
would make finding the call sites that need to add the new "MATERIALIZED"
keyword much easier.
David J.
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