Sergio Fernández created MARMOTTA-575:
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Summary: SELECT queries over a free subject generated to many
CROSS JOINs
Key: MARMOTTA-575
URL: https://issues.apache.org/jira/browse/MARMOTTA-575
Project: Marmotta
Issue Type: Improvement
Components: KiWi Triple Store
Affects Versions: 3.3.0
Reporter: Sergio Fernández
Fix For: 3.4.0
In the typical usage of SPARQL retrieving all properties for a concrete type:
{code:none}
SELECT ?uri ?var1 ?var2 ?varN
WHERE {
?uri a ex:type ;
ex:var1 ?var1 ;
ex:var2 ?var2 ;
ex:varN ?varN .
}
{code}
KiWI performs quite bad, because it creates a {{CROSS JOIN}} for each property.
Making the subject fixed is actually a quite fast query.
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