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List:       nepomuk
Subject:    Re: [Nepomuk] Some issues on current master
From:       Marco Martin <notmart () gmail ! com>
Date:       2012-05-31 9:13:19
Message-ID: 201205311113.19732.notmart () gmail ! com
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On Thursday 31 May 2012, you wrote:
> On Thursday 31 May 2012, Sebastian Tr=FCg wrote:
> > please see if this patch fixes the issue.
> > =

> > On 05/31/2012 10:24 AM, Marco Martin wrote:
> > > On Thursday 31 May 2012, Marco Martin wrote:
> > >> On Thursday 31 May 2012, Sebastian Tr=FCg wrote:
> > >>> which version of virtuoso are you using?
> > >>> =

> > >>> And, yes, the virtuoso branch needs to be merged in kdelibs indeed.
> > >> =

> > >> i tried on 2 different systems with 6.1.2 and 6.1.4, now i'm trying =
to
> > >> install 6.1.5
> > > =

> > > with 6.1.5 apparently there is the same issue of parse error (syntax
> > > error at exists)
> =

> now the query is actually executed, but a query like
> =

> select distinct ?r ?reqProp1 where { { OPTIONAL { ?r
> <http://www.semanticdesktop.org/ontologies/2007/01/19/nie#url> ?reqProp1 .
> FILTER(bif:exists((select (1) where { ?r a [
> <http://www.semanticdesktop.org/ontologies/2007/08/15/nao#userVisible>
> "true"^^<http://www.w3.org/2001/XMLSchema#boolean> ] . }))) . } }
> =

> (similar to what the query api tends to generate now)
> just spikes the cpu usage of virtuoso and will never finish

something like

select distinct ?r ?reqProp1 where {?r ?v1 ?v2 . FILTER(bif:exists((select =
(1) =

where { ?r a [ =

<http://www.semanticdesktop.org/ontologies/2007/08/15/nao#userVisible> =

"true"^^<http://www.w3.org/2001/XMLSchema#boolean> ] . }))) . }

seems to work.

however, with the query api if you do something like

m_query.addRequestProperty(Nepomuk::Query::Query::RequestProperty(NIE::url(=
)));

to have some properties already in the result to minimize round-trips, the =

generated query becomes as the one i put before,
 select distinct ?r ?reqProp1 where { { OPTIONAL { ?r
 <http://www.semanticdesktop.org/ontologies/2007/01/19/nie#url> ?reqProp1 .
 FILTER(bif:exists((select (1) where { ?r a [
 <http://www.semanticdesktop.org/ontologies/2007/08/15/nao#userVisible>
 "true"^^<http://www.w3.org/2001/XMLSchema#boolean> ] . }))) . } }

with one filter clause inside each OPTIONAL block, and this seems to kill =

virtuoso (6.1.5 on this machine now)

Cheers,
Marco Martin
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