Re: proposal: tuplestore, tuplesort aggregate functions

Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
> 2010/8/18 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
>> There would be plenty of scope to re-use the machinery without any
>> SQL-level extensions. 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