The tractability frontier of well-designed SPARQL queries
SIGMOD/PODS '18: International Conference on Management of Data Houston TX USA June, 2018, pp. 295-306, 2018.
We study the complexity of query evaluation of SPARQL queries. We focus on the fundamental fragment of well-designed SPARQL restricted to the AND, OPTIONAL and UNION operators. Our main result is a structural characterisation of the classes of well-designed queries that can be evaluated in polynomial time. In particular, we introduce a ne...More
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