On 14/02/2019 11:17, Alvaro Herrera wrote: > On 2019-Feb-13, Alvaro Herrera wrote: > >> It definitely is ... plans have changed from using IndexOnly scans to >> Seqscans, which is likely fallout from the visibilitymap_count() change. > I think the problem here is that "unsigned long" is 32 bits in this > machine:
From my memory of reading of K&R many moons ago, it said that C only guarantees that the lengths are such that
byte <= half word <= word <= long
But I don't recall ever seeing a long less than 32 bits!