GH-4899 We should always set a ColletionFactory supplier and allow for

specialization.

This way at least one is set.

core/queryalgebra/evaluation/src/main/java/org/eclipse/rdf4j/query/algebra/evaluation/impl/StrictEvaluationStrategyFactory.java

@@ -13,6 +13,7 @@
 import java.util.function.Supplier;
 
 import org.eclipse.rdf4j.collection.factory.api.CollectionFactory;
+import org.eclipse.rdf4j.collection.factory.impl.DefaultCollectionFactory;
 import org.eclipse.rdf4j.query.Dataset;
 import org.eclipse.rdf4j.query.algebra.evaluation.EvaluationStrategy;
 import org.eclipse.rdf4j.query.algebra.evaluation.TripleSource;
@@ -27,7 +28,7 @@ public class StrictEvaluationStrategyFactory extends AbstractEvaluationStrategyF
 		implements FederatedServiceResolverClient {
 
 	private FederatedServiceResolver serviceResolver;
-	protected Supplier<CollectionFactory> collectionFactorySupplier;
+	protected Supplier<CollectionFactory> collectionFactorySupplier = DefaultCollectionFactory::new;
 
 	public StrictEvaluationStrategyFactory() {
 	}