add benchmark

core/sail/memory/src/test/java/org/eclipse/rdf4j/sail/memory/benchmark/QueryBenchmark.java

@@ -21,6 +21,7 @@
 import org.eclipse.rdf4j.common.transaction.IsolationLevels;
 import org.eclipse.rdf4j.query.BindingSet;
 import org.eclipse.rdf4j.query.TupleQueryResult;
+import org.eclipse.rdf4j.query.explanation.Explanation;
 import org.eclipse.rdf4j.repository.sail.SailRepository;
 import org.eclipse.rdf4j.repository.sail.SailRepositoryConnection;
 import org.eclipse.rdf4j.rio.RDFFormat;
@@ -67,6 +68,7 @@ public class QueryBenchmark {
 	private static final String query_distinct_predicates;
 	private static final String simple_filter_not;
 	private static final String wild_card_chain_with_common_ends;
+	private static final String sub_select;
 
 	static {
 		try {
@@ -95,6 +97,8 @@ public class QueryBenchmark {
 					StandardCharsets.UTF_8);
 			wild_card_chain_with_common_ends = IOUtils.toString(
 					getResourceAsStream("benchmarkFiles/wild-card-chain-with-common-ends.qr"), StandardCharsets.UTF_8);
+			sub_select = IOUtils.toString(
+					getResourceAsStream("benchmarkFiles/sub-select.qr"), StandardCharsets.UTF_8);
 
 		} catch (IOException e) {
 			throw new RuntimeException(e);
@@ -363,6 +367,15 @@ public long simple_filter_not() {
 //		}
 //	}
 
+	@Benchmark
+	public long subSelect() {
+		try (SailRepositoryConnection connection = repository.getConnection()) {
+			return count(connection
+					.prepareTupleQuery(sub_select)
+					.evaluate());
+		}
+	}
+
 	private static InputStream getResourceAsStream(String filename) {
 		return QueryBenchmark.class.getClassLoader().getResourceAsStream(filename);
 	}

core/sail/memory/src/test/resources/benchmarkFiles/sub-select.qr

@@ -0,0 +1,38 @@
+PREFIX ex: <http://example.com/ns#>
+PREFIX owl: <http://www.w3.org/2002/07/owl#>
+PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
+PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+PREFIX sh: <http://www.w3.org/ns/shacl#>
+PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
+PREFIX dcat: <http://www.w3.org/ns/dcat#>
+PREFIX dc: <http://purl.org/dc/terms/>
+PREFIX skos:  <http://www.w3.org/2004/02/skos/core#>
+PREFIX foaf:  <http://xmlns.com/foaf/0.1/>
+PREFIX dct: <http://purl.org/dc/terms/>
+
+SELECT ?type1 ?type2 ?language2 ?mbox ?count ?identifier2 where {
+
+    ?a a ?type2.
+    ?b a ?type1.
+
+    ?b dcat:dataset ?a.
+
+    ?a dcat:distribution ?mbox.
+    ?a dct:language ?language.
+    FILTER (?type1 != ?type2)
+    ?a dct:identifier ?identifier.
+
+    BIND(?a as ?c)
+
+    {
+        select distinct ?c (count(?dist) as ?count) ?language2 where {
+            ?c a ?type2.
+            ?c dcat:distribution ?dist.
+            ?c dct:language ?language2.
+        } group by ?c ?language2 having (?count > 2)
+    }
+
+} group by ?type1 ?type2 ?language2 ?mbox ?count ?identifier2 order by ?type1 ?type2 ?language2 ?mbox ?count ?identifier2
+
+
+