Dmitry Zhelobanov created JENA-2288:
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Summary: Counting aggregation inside SERVICE provides wrong result
Key: JENA-2288
URL: https://issues.apache.org/jira/browse/JENA-2288
Project: Apache Jena
Issue Type: Bug
Affects Versions: Jena 4.4.0
Reporter: Dmitry Zhelobanov
Here is a query which retrieves museums in the specific city:
{code:java}
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
SELECT ?wikidata_iri ?museum
WHERE {
VALUES (?wikidata_iri) { (<http://www.wikidata.org/entity/Q612>) } .
SERVICE <https://query.wikidata.org/sparql> {
{
select ?wikidata_iri ?museum
where {
OPTIONAL {
?museum (wdt:P131)+ ?wikidata_iri ;
wdt:P31/(wdt:P279)* wd:Q33506 .
}
}
}
}
} {code}
This query returns 3 results:
|<http://www.wikidata.org/entity/Q612>|<http://www.wikidata.org/entity/Q2125281>|
|<http://www.wikidata.org/entity/Q612>|<http://www.wikidata.org/entity/Q28736367>|
|<http://www.wikidata.org/entity/Q612>|<http://www.wikidata.org/entity/Q67737768>|
And here is a query which is supposed to count the number of the same museums
in the same city:
{code:java}
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
SELECT ?wikidata_iri ?museum_count_in_city
WHERE {
VALUES (?wikidata_iri) { (<http://www.wikidata.org/entity/Q612>) } .
SERVICE <https://query.wikidata.org/sparql> {
{
select ?wikidata_iri (COUNT(?museum) as ?museum_count_in_city)
where {
OPTIONAL {
?museum (wdt:P131)+ ?wikidata_iri ;
wdt:P31/(wdt:P279)* wd:Q33506 .
}
} group by ?wikidata_iri
}
}
}{code}
But the count value produced by the query is wrong:
|<[http://www.wikidata.org/entity/Q612]>|"201"{^}^^<[http://www.w3.org/2001/XMLSchema#integer]>{^}|
It outputs *201* instead of expected *3.*
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