| From: | Dmitry Dolgov <9erthalion6(at)gmail(dot)com> |
|---|---|
| To: | Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com> |
| Cc: | a(dot)kuzmenkov(at)postgrespro(dot)ru, pg(at)bowt(dot)ie, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, Bhushan Uparkar <bhushan(dot)uparkar(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru> |
| Subject: | Re: Index Skip Scan |
| Date: | 2018-09-27 20:28:34 |
| Message-ID: | CA+q6zcXdP=PCaVRx3OgpyKK+NgNfrnnSA66rkvxRLeZrkYjEaA@mail.gmail.com |
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| Lists: | pgsql-hackers |
> On Thu, 27 Sep 2018 at 15:59, Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com> wrote:
>
> I think we need a comment on this in the patch, as 10 *
> node->ioss_PlanRows looks a bit random.
Yeah, you're right, it's a bit arbitrary number - we just need to make sure
that this estimation is not too small (to avoid false positives), but also not
too big (to not miss a proper point for fallback). I left it uncommented mostly
because I wanted to get some feedback on it first, and probably some
suggestions about how to make this estimation better.
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