"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> Robert Haas <robertmhaas@gmail.com> wrote:
>> I suppose there could also be a bit of an ambiguity if you're working
>> with a type like int4 where the values are discrete steps. Like, what
>> do you do with {1, 2}?
Hmm, good point.
> The same thing you do with the avg function?
avg's approach is not at all datatype-independent though. If you're
willing to give up the idea of a polymorphic median() function, that
would probably be the thing to do. If not, you need to take the left
or right one of the two central elements.
regards, tom lane