| From: | Andy Fan <zhihuifan1213(at)163(dot)com> |
|---|---|
| To: | Nikita Malakhov <hukutoc(at)gmail(dot)com> |
| Cc: | Andrei Lepikhov <lepihov(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, David Rowley <dgrowleyml(at)gmail(dot)com> |
| Subject: | Re: Considering fractional paths in Append node |
| Date: | 2024-10-19 00:03:57 |
| Message-ID: | 87cyjx2c2a.fsf@163.com |
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| Lists: | pgsql-hackers |
Nikita Malakhov <hukutoc(at)gmail(dot)com> writes:
Hi Nikita,
> Hi!
>
> Andy, one quick question - what do you think on using
> root->limit_tuples as a guidance on how many
> rows we have to consider in plans cost?
Within my exprerience, the committer probabaly dislikes the idea of
"ignoring the difference of tuple_fraction between subquery level and
RelOptInfo level" and the committers dislikes a complex soluation like
what I did in [1]. Maybe you can try to figure out completed and simple
soluation to make everyone happy, but I have no idea about on this right
now.
--
Best Regards
Andy Fan
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