| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, 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> |
| Subject: | Re: CTE inlining |
| Date: | 2017-05-02 02:42:18 |
| Message-ID: | CA+TgmoYEQpxrpLvPeJhjH85z2qnw2qiTCtuN8TeUt2iBFAghvA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sun, Apr 30, 2017 at 5:54 PM, Tomas Vondra
<tomas(dot)vondra(at)2ndquadrant(dot)com> wrote:
> But I keep running into people who face serious performance issues exactly
> because not realizing this, and using CTEs as named subqueries. And when I
> tell them "optimization fence" they react "Whaaaaaaat?"
>
> If I had to make up some numbers, I'd say the "Whaaaaat?" group is about 10x
> the group of people who intentionally rely on CTEs being optimization
> fences.
+1.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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