BTW, I am still looking for a reason for the hard-prune logic to live.
It seems to complicate matters far more than it's worth --- in
particular the way that the WAL replay representation is set up seems
confusing and fragile. (If prune_hard is set, the "redirect" entries
mean something completely different.) There was some suggestion that
VACUUM FULL has to have it, but unless I see proof of that I'm thinking
of taking it out.
regards, tom lane
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TIP 9: In versions below 8.0, the planner will ignore your desire to
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