| From: | Dmitry Dolgov <9erthalion6(at)gmail(dot)com> |
|---|---|
| To: | David Rowley <dgrowleyml(at)gmail(dot)com> |
| Cc: | Floris Van Nee <florisvannee(at)optiver(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Peter Geoghegan <pg(at)bowt(dot)ie>, Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, James Coleman <jtc331(at)gmail(dot)com>, Rafia Sabih <rafia(dot)pghackers(at)gmail(dot)com>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, "bhushan(dot)uparkar(at)gmail(dot)com" <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: | 2020-05-10 17:36:58 |
| Message-ID: | 20200510173658.kfmyzsrmcr2n3cre@localhost |
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| Lists: | pgsql-hackers |
Sorry for late reply.
> On Tue, Apr 14, 2020 at 09:19:22PM +1200, David Rowley wrote:
>
> I've not yet looked at the latest patch, but I did put some thoughts
> into an email on the other thread that's been discussing UniqueKeys
> [1].
>
> I'm keen to hear thoughts on the plan I mentioned over there. Likely
> it would be best to discuss the specifics of what additional features
> we need to add to UniqueKeys for skip scans over here, but discuss any
> chances which affect both patches over there. We certainly can't have
> two separate implementations of UniqueKeys, so I believe the skip
> scans UniqueKeys patch should most likely be based on the one in [1]
> or some descendant of it.
>
> [1] https://www.postgresql.org/message-id/CAApHDvpx1qED1uLqubcKJ=oHatCMd7pTUKkdq0B72_08nbR3Hw@mail.gmail.com
Yes, I've come to the same conclusion, although I have my concerns about
having such a dependency between patches. Will look at the suggested
patches soon.
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