- From: Steve Harris <steve.harris@garlik.com>
- Date: Fri, 11 Feb 2011 15:09:29 +0000
- To: Matthew Perry <matthew.perry@oracle.com>
- Cc: SPARQL Working Group <public-rdf-dawg@w3.org>
It does as written, but that's an unintended consequence, the def'n of Count() will need to be change to not count error values. - Steve On 2011-02-11, at 14:00, Matthew Perry wrote: > Hi Steve, > > Lets say M = (1, 2, 3, "a", "b") > > Does this change COUNT(xsd:int(?x)) from 3 to 5? > > - Matt > > On 2/11/2011 7:03 AM, Steve Harris wrote: >> I've spoken with Andy on IRC, and he also agrees that it's probably better without it, so the current draft of rq25 doesn't have the error count argument. >> >> Following some discussion on IRC last night, I've also clarified the return types of the set functions. >> >> - Steve >> >> On 2011-02-11, at 10:55, Steve Harris wrote: >> >>> Hi all, >>> >>> Currently the Set Functions in Aggregates (ie. the underlying functions) are defined like: >>> >>> Func(M, errors, scalars) >>> >>> where M a multiset of the values from the group, e.g. if you have SUM(?x) and ?x is 1,2,3 in the group, then M = (1,2,3). But M is defined used ListEvalE(), so all the results which are errors are removed from the multiset. >>> >>> errors is a count of the errors (which where removed from M). >>> >>> I think it would be much simpler if instead M included the errors, and the error count argument was dropped, then it would be: >>> >>> M = ListEval(exprlist, range(g)) >>> >>> func(M, scalarvals), for non-DISTINCT >>> func(Distinct(M), scalarvals), for DISTINCT >>> >>> Dave B also complained about the error count argument saying it was redundant in his comment. >>> >>> I don't quite remember why it was included? I think Andy S might have suggested it, something about future extensibility? But I don't see what function it performs. >>> >>> So, my question is, can anyone think of a good reason to keep it? >>> >>> - Steve >>> >>> -- >>> Steve Harris, CTO, Garlik Limited >>> 1-3 Halford Road, Richmond, TW10 6AW, UK >>> +44 20 8439 8203 http://www.garlik.com/ >>> Registered in England and Wales 535 7233 VAT # 849 0517 11 >>> Registered office: Thames House, Portsmouth Road, Esher, Surrey, KT10 9AD >>> >>> > -- Steve Harris, CTO, Garlik Limited 1-3 Halford Road, Richmond, TW10 6AW, UK +44 20 8439 8203 http://www.garlik.com/ Registered in England and Wales 535 7233 VAT # 849 0517 11 Registered office: Thames House, Portsmouth Road, Esher, Surrey, KT10 9AD
Received on Friday, 11 February 2011 15:10:05 UTC