| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(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: | 2019-09-24 12:06:27 |
| Message-ID: | 20190924120627.GA12454@alvherre.pgsql |
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| Lists: | pgsql-hackers |
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? :-)
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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