Sorry, I did not see your previous answer.
This behaviour (wrong zero result) happens when these conditions are met
( I don't know how many are needed):
1- multiple from
2- multiple filters
3- "OR" inside a filter
In some query removing the multiple from is enough but more often I saw
the problem remains with the other conditions.
This is the case with the last query i sent and for sure this is a
problem as well!
Moreover I could not find a query with multiple from reproducing the bug
in a public sparql enpoint.
I used a workaround in my system (using every filter in a subquery) butt
even in this way I had to remove the from statements otherwise I got 0
results.
Hope it explains the issue.
If you really need some data I can try to export something from my
datasource but it will takes me some time.
Thanks for the help
Nicola
On 08/12/2013 15:43, Hugh Williams wrote:
Hi Nicola,
Thought I has seen this post before, you seem to have asked the same
question two weeks ago and gave the same response, but the queries
below do not have any from clauses, which is the subject of the
original problem, thus in what way are they related ?
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
Weblog -- http://www.openlinksw.com/blogs/
LinkedIn -- http://www.linkedin.com/company/openlink-software/
Twitter -- http://twitter.com/OpenLink
Google+ -- http://plus.google.com/100570109519069333827/
Facebook -- http://www.facebook.com/OpenLinkSoftware
Universal Data Access, Integration, and Management Technology Providers
On 8 Dec 2013, at 13:18, ghirardi nicola <n.ghira...@cineca.it
<mailto:n.ghira...@cineca.it>> wrote:
Hi
A very similar query not working as expected is this one.
In this case multiple form is not involved but It's a very similar
pattern and I suppose is related.
This query return 0:
SELECT ?s
WHERE
{
?s rdf:type <http://dbpedia.org/ontology/Agent>.
?s <http://purl.org/dc/terms/subject> ?p2 .
FILTER NOT EXISTS { ?s <http://dbpedia.org/ontology/alias> "The Bad
Samaritans" . }
FILTER (
?p2=<http://dbpedia.org/resource/Category:British_punk_rock_groups>
||
?p2=<http://dbpedia.org/resource/Category:English_rock_music_groups> )
}
This query return lots of result (removing or):
SELECT ?s
WHERE
{
?s rdf:type <http://dbpedia.org/ontology/Agent>.
?s <http://purl.org/dc/terms/subject> ?p2 .
FILTER NOT EXISTS { ?s <http://dbpedia.org/ontology/alias> "The Bad
Samaritans" . }
FILTER (
?p2=<http://dbpedia.org/resource/Category:British_punk_rock_groups> )
}
Nicola
On 06/12/2013 18:43, Hugh Williams wrote:
Hi Nicola,
Are you able to provide a test case to recreate this behaviour we
can setup locally ?
Best Regards
Hugh Williams
Professional Services
OpenLink Software, Inc. // http://www.openlinksw.com/
Weblog -- http://www.openlinksw.com/blogs/
LinkedIn -- http://www.linkedin.com/company/openlink-software/
Twitter -- http://twitter.com/OpenLink
Google+ -- http://plus.google.com/100570109519069333827/
Facebook -- http://www.facebook.com/OpenLinkSoftware
Universal Data Access, Integration, and Management Technology Providers
On 20 Nov 2013, at 19:20, ghirardi nicola <n.ghira...@cineca.it
<mailto:n.ghira...@cineca.it>> wrote:
According to the SPARQL reference, multiple FROM clauses should mean a
query over the merge of all specified datasets.
http://www.w3.org/TR/sparql11-query/#unnamedGraph
I used multiple graph in a query and a combination of filter and
minus operators in "where" clause in this way:
SELECT ?s
FROM <graph1>
FROM <graph2>
WHERE
{
?s rdf:type <type1>
MINUS { ?s <p1> ?p1 .
}
?s <p2> ?p2 FILTER ( ?p2='p2_1' || ?p2='p2_2' )
}
The result is 0 (it should not).
It does not happen removing the first graph or removing the "or" in
the filter (or the minus clause).
Thanks for the help
Nicola Ghirardi
CINECA
Italy
PS.
I'm using Virtuoso version 07.00.3203 on Linux
(x86_64-pc-linux-gnu), Single Server Edition
This the query "explain":
{
Precode:
0: __rdflit := Call __rdflit (rdflit1067587)
5: __rdflit := Call __rdflit (rdflit1067586)
10: BReturn 0
RDF_QUAD_POGS 4.2e+02 rows(s_13_8_t2.O, s_13_8_t2.S, s_13_8_t2.G)
P = #ssd , O = $32 "in_iter"
END Node
After test:
0: one_of_these := Call one_of_these (s_13_8_t2.G,
#database/repositories/rlink/config ,
#database/repositories/rlink/researchUgovData )
5: if ( 0 < one_of_these) then 9 else 31 unkn 31
9: if ({
RDF_QUAD 0.41 rows(s_12_4_t0.G)
inlined P = #hasVersion , S = k_s_13_8_t2.S
END Node
After test:
0: one_of_these := Call one_of_these (s_12_4_t0.G,
#database/repositories/rlink/config ,
#database/repositories/rlink/researchUgovData )
5: if ( 0 < one_of_these) then 9 else 10 unkn 10
9: BReturn 1
10: BReturn 0
Subquery Select( <none> )
}
) then 31 else 13 unkn 31
13: isiri_id := Call isiri_id (s_13_8_t2.O)
18: temp := artm 1 - isiri_id
22: temp := artm 1 - isiri_id
26: if ( 0 = temp) then 31 else 30 unkn 31
30: BReturn 1
31: BReturn 0
in iterates in_iter over ( #database/repositories/rlink/config ,
#database/repositories/rlink/researchUgovData )
RDF_QUAD 0.18 rows(s_13_8_t1.S)
inlined P = #type , S = k_s_13_8_t2.S , O = #ResearchContent , G
= k_in_iter
After code:
0: istanza := Call __id2in (s_13_8_t1.S)
5: BReturn 0
Select (istanza)
}
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