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Re: Index Skip Scan - Mailing list pgsql-hackers

From Alvaro Herrera
Subject Re: Index Skip Scan
Date
Msg-id 20190924120627.GA12454@alvherre.pgsql
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In response to Re: Index Skip Scan  (Kyotaro Horiguchi <horikyota.ntt@gmail.com>)
Responses Re: Index Skip Scan
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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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