| From: | Andrew Dunstan <andrew(dot)dunstan(at)2ndquadrant(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Serge Rielau <serge(at)rielau(dot)com>, Gavin Flower <GavinFlower(at)archidevsys(dot)co(dot)nz>, Craig Ringer <craig(dot)ringer(at)2ndquadrant(dot)com>, Ilya Shkuratov <motr(dot)ilya(at)ya(dot)ru>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Mario Becroft <mb(at)true(dot)group> |
| Subject: | Re: CTE inlining |
| Date: | 2017-05-04 17:44:12 |
| Message-ID: | b3b9ebf1-28b6-394a-d99b-52ff11d58df3@2ndQuadrant.com |
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| Lists: | pgsql-hackers |
On 05/04/2017 01:33 PM, Alvaro Herrera wrote:
> Andrew Dunstan wrote:
>
>> Hadn't though about LATERAL, good point. Still, there will be other cases.
> I'm not sure what your point is. We know that for some cases the
> optimization barrier semantics are useful, which is why the proposal is
> to add a keyword to install one explicitely:
>
> with materialized r as
> (
> select json_populate_record(null::mytype, myjson) as x
> from mytable
> )
> select (x).*
> from r;
>
> this would preserve the current semantics.
>
I understand. Some people appear to think hardly anyone will actually
need this - that's what I was arguing against.
cheers
andrew
--
Andrew Dunstan https://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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