David Fetter <david@fetter.org> writes:
> I think what the OP was expecting was to have the last value be 3
> instead of changing. This is at least a POLA violation.
[ shrug... ] It's what the spec requires, as far as anybody here
can tell. As Hitoshi-san already noted, we do point out in our
docs that last_value is not too useful unless you use a nondefault
window frame selection. I'm not sure what else we could do.
regards, tom lane