| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Andrei Lepikhov <lepihov(at)gmail(dot)com> |
| Cc: | Jakub Wartak <jakub(dot)wartak(at)enterprisedb(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Subject: | Re: allowing extensions to control planner behavior |
| Date: | 2024-10-23 11:46:58 |
| Message-ID: | CA+TgmobH2CyoVuNOmzZarspGYbLEtjLax3FgP1ubrAo2tqhvxg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Oct 23, 2024 at 11:51 AM Andrei Lepikhov <lepihov(at)gmail(dot)com> wrote:
> Parse tree may be implemented with multiple execution plans. Even
> clauses can be transformed during optimisation (Remember OR -> ANY).
> Also, the cardinality of a middle-tree join depends on the inner and
> outer subtrees. Because of that, having a hash on RelOptInfo's relids
> and restrictions + hashes of child RelOptInfos and carrying it through
> all other stages up to the end of execution is the most stable approach
> I know.
I'm not saying there's a better way to do it today. I'm saying I think
there SHOULD be a better way to do it.
--
Robert Haas
EDB: http://www.enterprisedb.com
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