PSPP-BUG: [bug #11975] AGGREGATE should support MEDIAN function

[John Darrington]

Follow-up Comment #3, bug #11975 (project pspp):

Although there is opportunity to reduce the total number of passes, we can't
get around the need to sort and iterate for each median being calculated.

With this patch, the total number of sorts is N and the total number of
passes is (N+1), where N is the number of medians to be calculated.  With some
rework, it could be got down to N sorts and N passes, but I'm not sure if it's
worth the effort.


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