| From: | Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com> |
|---|---|
| To: | alvherre(at)2ndquadrant(dot)com |
| Cc: | 9erthalion6(at)gmail(dot)com, florisvannee(at)optiver(dot)com, jesper(dot)pedersen(at)redhat(dot)com, david(dot)rowley(at)2ndquadrant(dot)com, thomas(dot)munro(at)gmail(dot)com, jtc331(at)gmail(dot)com, rafia(dot)pghackers(at)gmail(dot)com, jeff(dot)janes(at)gmail(dot)com, pg(at)bowt(dot)ie, tomas(dot)vondra(at)2ndquadrant(dot)com, thomas(dot)munro(at)enterprisedb(dot)com, bhushan(dot)uparkar(at)gmail(dot)com, pgsql-hackers(at)postgresql(dot)org, a(dot)korotkov(at)postgrespro(dot)ru |
| Subject: | Re: Index Skip Scan |
| Date: | 2019-09-25 01:03:01 |
| Message-ID: | 20190925.100301.198068449.horikyota.ntt@gmail.com |
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| Lists: | pgsql-hackers |
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.
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center
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