GH-3994: Improved TDB2 index access for single pattern queries#3995
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Aklakan wants to merge 1 commit into
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GH-3994: Improved TDB2 index access for single pattern queries#3995Aklakan wants to merge 1 commit into
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GitHub issue resolved #3994
Pull request Description: Adds skip scan evaluation for single-pattern queries to TDB2. Added special code paths to
OpExecutorTDB2forOpDistinctandOpGroupBy.Execution time to find all distinct predicates on Wikidata Truthy (8B triples) becomes between 1 and 100 seconds (warm-cold caches)
Also works for simple group by patterns such as
SELECT ?p (COUNT(DISTINCT ?g) AS ?c) { GRAPH ?g { ?s ?p ?o } } GROUP BY ?pNeed yet to add tests - such as create permutations of patterns and compare results with a reference engine (eg. ARQ).
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See the Apache Jena "Contributing" guide.