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
