On 27/01/15 17:32, Qiaser Mehmood wrote:
What could be the reason of results (listOfPropertiesInDataset) difference for
the same query which runs on two different engine e.g. fuseki and sesame. I
dumped the Kegg data into fuseki and sesame and when I run the following query
the results vary.
PREFIX void: <http://rdfs.org/ns/void#> CONSTRUCT { <datasetUri>
void:propertyPartition ?pUri . ?pUri void:property ?p . } WHERE { ?s ?p ?o .
BIND(IRI(CONCAT(STR(<baseUri>),MD5(STR(?p)))) AS ?pUri)}
In fuseki it returns 42 and in sesame it returns back 740444
Best,Qaiser.
I guess there are 42 different predicates in the data.
SELECT (count(distinct ?p) AS ?count ) { ?s ?p /o }
Jena returns a model, a set of triples. Set means no duplicates.
It looks liek you are using the form of execution in Sesame that returns
an iterator of stream of triples. No suppression of duplicates.
In your query:
PREFIX void: <http://rdfs.org/ns/void#>
CONSTRUCT
{ <http://example/base/datasetUri> void:propertyPartition ?pUri .
?pUri void:property ?p .}
WHERE
{ ?s ?p ?o
BIND(iri(concat(str(<http://example/base/baseUri>), MD5(str(?p))))
AS ?pUri)
}
Your query has massive duplicates - it projects out ?s and ?o..
Many ?s ?p ?o, few distinct ?p
Try this:
WHERE
{ SELECT DISTINCT ?p ?pUri {
?s ?p ?o
BIND(iri(concat(str(<http://example/base/baseUri>), MD5(str(?p))))
AS ?pUri)
}
}
Andy
