At Tue, 24 Sep 2019 09:06:27 -0300, Alvaro Herrera <alvhe...@2ndquadrant.com> wrote in <20190924120627.GA12454@alvherre.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
