| From: | Dmitry Dolgov <9erthalion6(at)gmail(dot)com> |
|---|---|
| To: | Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com> |
| Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Floris Van Nee <florisvannee(at)optiver(dot)com>, Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com>, David Rowley <david(dot)rowley(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>, Peter Geoghegan <pg(at)bowt(dot)ie>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, 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: | 2019-09-25 09:34:22 |
| Message-ID: | CA+q6zcWUqeX18UJxMBP4m=4Sz2upS_FikooE07JT5zZryzBNpA@mail.gmail.com |
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| Lists: | pgsql-hackers |
> On Wed, Sep 25, 2019 at 3:03 AM Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com> wrote:
>
> At Tue, 24 Sep 2019 09:06:27 -0300, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> wrote in <20190924120627(dot)GA12454(at)alvherre(dot)pgsql>
> > On 2019-Sep-24, Kyotaro Horiguchi wrote:
> >
> > > Sorry, it's not a boolean. A tristate value. From the definition
> > > (Back, NoMove, Forward) = (-1, 0, 1), (dir1 == -dir2) if
> > > NoMovement did not exist. If it is not guranteed,
> > >
> > > (dir1 != 0 && dir1 == -dir2) ?
> >
> > Maybe just add ScanDirectionIsOpposite(dir1, dir2) with that
> > definition? :-)
>
> Yeah, sounds good to establish it as a part of ScanDirection's
> definition.
Yep, this way looks better.
| Attachment | Content-Type | Size |
|---|---|---|
| v27-0001-Index-skip-scan.patch | application/octet-stream | 77.8 KB |
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