Castor: a Constraint-based SPARQL Engine with Active Filter Processing

Presented at: 9th Extended Semantic Web Conference (ESWC2012)

by Vianney Le Clément De Saint-Marcq, Yves Deville, Christine Solnon, Pierre-Antoine Champin

Efficient evaluation of complex SPARQL queries is still an open research problem. State-of-the-art engines are based on relational database technologies. We approach the problem from the perspective of Constraint Programming (CP), a technology designed for solving NP-hard problems. Such technology allows us to exploit SPARQL filters early-on during the search instead of as a post-processing step. We propose Castor, a new SPARQL engine based on CP. Castor performs very competitively compared to state-of-the-art engines.

Keywords: Constraint Programming, Query engine implementation, SPARQL

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