| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Mark Wong <markwkm(at)gmail(dot)com> |
| Subject: | Re: nested loop semijoin estimates |
| Date: | 2015-06-05 12:21:45 |
| Message-ID: | CA+TgmoaJPQnte04tLV2zo5D6CTnL4Bu6pQiQ4UKtjmrhdrZb7g@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Jun 2, 2015 at 10:10 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> What it seems like we should do, if we want to back-patch this, is apply
> it without the add_path_precheck changes. Then as an independent
> HEAD-only patch, change add_path_precheck so that it's behaving as
> designed. It looks to me like that will save some planning time in any
> case --- changing add_path_precheck to disregard startup cost when
> appropriate seems to let it reject a lot more paths than it used to.
I'd just like to mention that I really appreciate the time and thought
that went into keeping the back-patched portion of this fix narrow.
Thanks!
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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