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Re: Aggregate extensibility

From: Steve Harris <steve.harris@garlik.com>
Date: Tue, 30 Mar 2010 17:59:49 +0100
Cc: Ivan Mikhailov <imikhailov@openlinksw.com>, Axel Polleres <axel.polleres@deri.org>, Orri Erling <erling@xs4all.nl>, SPARQL Working Group <public-rdf-dawg@w3.org>
Message-Id: <91051170-9BB6-4F26-8652-A343E0D36358@garlik.com>
To: Andy Seaborne <andy.seaborne@talis.com>
On 2010-03-30, at 16:52, Andy Seaborne wrote:
> 
> On 30/03/2010 3:26 PM, Ivan Mikhailov wrote:
>> Hello Axel,
> ...
> 
>>> Would we also allow aggregates with arityy different to 1 (like common in functions) e.g. agg-uri(?X ?Y)
>> 
>> That's absolutely required for statistical calculations of all sorts,
>> from regression to likelihood detection.
> >
> > Best Regards,
> >
> > Ivan.
> 
> At F2F3, we decided to not restrict the arity to 1 for custom aggregates (and they can have parameters to the aggregator as well as arguments to aggregate over).

We did? It sounds plausible, but I don't actually remember that. Is it a parser issue?

- Steve

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Received on Tuesday, 30 March 2010 17:00:19 GMT

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