Pavel Stehule <pavel.steh...@gmail.com> writes: > 2010/8/18 Tom Lane <t...@sss.pgh.pa.us>: >> There would be plenty of scope to re-use the machinery without any >> SQL-level extensions. Â All you need is a polymorphic aggregate >> transition function that maintains a tuplestore or whatever.
> Have we to use a transisdent function? If we implement median as > special variant of aggregate - because we need to push an sort, then > we can skip a transident function function - and call directly final > function. Well, that would require a whole bunch of *other* mechanisms, which you weren't saying anything about in your original proposal. But driving it off the transtype declaration would be quite inappropriate anyway IMO. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers