Re: proposal: tuplestore, tuplesort aggregate functions

2010/8/18 David Fetter <david(at)fetter(dot)org>:
> On Wed, Aug 18, 2010 at 04:10:18PM +0200, Pavel Stehule wrote:
>> 2010/8/18 David Fetter <david(at)fetter(dot)org>:
>> > Which median do you plan to implement?  Or do you plan to implement
>> > several different medians, each with distinguishing names?
>>
>> my proposal enabled implementation of any "median like" function. But
>> if we implement median as special case of aggregate, then some basic
>> "median" will be implemented.
>
> Apart from the medians, which "median-like" aggregates do you have in
> mind to start with?  If you can provide examples of "median-like"
> aggregates that people might need to implement as user-defined
> aggregates, or other places where people would use this machinery, it
> will make your case stronger for this refactoring.
>

I didn't think about some special median - this proposal is just about
aggregates with large a transistent data. Then the access to
tuplestore can be very usefull.

> Otherwise, it seems like a more reasonable thing to make the medians
> special case code.

yes, minimally for this moment.

Regards

Pavel

>
> Cheers,
> David.
> --
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