| From: | Andy Fan <zhihui(dot)fan1213(at)gmail(dot)com> |
|---|---|
| To: | David Rowley <dgrowleyml(at)gmail(dot)com> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Zhang Mingli <zmlpostgres(at)gmail(dot)com> |
| Subject: | Re: make add_paths_to_append_rel aware of startup cost |
| Date: | 2023-09-18 10:55:46 |
| Message-ID: | CAKU4AWqaTNPrYcb_cMEDDYWZVGfFxuUjr75F5LBZwnUQ0JvVPw@mail.gmail.com |
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| Thread: | |
| Lists: | pgsql-hackers |
Hi,
> What do you think about this in my last reply? "If my above
> analysis is correct, I think the best way to handle this is if there
> is no more tables to join, we use cheapest fraction cost for all
> the kinds of relations, including plain relation, append rel,
> subquery and so on, If we have more tables to join, we use
> cheapest startup cost.". This is what is in my mind now.
>
>
Here is an updated version to show what's in my mind.
--
Best Regards
Andy Fan
| Attachment | Content-Type | Size |
|---|---|---|
| v3-0001-make-add_paths_to_append_rel-aware-of-startup_cos.patch | application/octet-stream | 23.0 KB |
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