| package org.apache.rya.indexing.pcj.matching; |
| |
| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.rya.indexing.IndexPlanValidator.IndexedExecutionPlanGenerator; |
| import org.apache.rya.indexing.external.tupleSet.ExternalTupleSet; |
| import org.apache.rya.indexing.external.tupleSet.SimpleExternalTupleSet; |
| |
| import org.junit.Assert; |
| import org.junit.Test; |
| import org.openrdf.query.MalformedQueryException; |
| import org.openrdf.query.algebra.Projection; |
| import org.openrdf.query.algebra.QueryModelNode; |
| import org.openrdf.query.algebra.StatementPattern; |
| import org.openrdf.query.algebra.TupleExpr; |
| import org.openrdf.query.algebra.helpers.QueryModelVisitorBase; |
| import org.openrdf.query.parser.ParsedQuery; |
| import org.openrdf.query.parser.sparql.SPARQLParser; |
| |
| import com.google.common.collect.Sets; |
| |
| public class PCJOptimizerTest { |
| |
| @Test |
| public void testBasicSegment() throws Exception { |
| |
| String query1 = ""// |
| + "SELECT ?e ?c ?l" // |
| + "{" // |
| + " ?e a ?c . "// |
| + " OPTIONAL {?e <uri:talksTo> ?l} . "// |
| + " ?e <http://www.w3.org/2000/01/rdf-schema#label> ?l "// |
| + "}";// |
| |
| String query2 = ""// |
| + "SELECT ?a ?b ?m" // |
| + "{" // |
| + " ?a a ?b . "// |
| + " OPTIONAL {?a <uri:talksTo> ?m} . "// |
| + "}";// |
| |
| SPARQLParser parser = new SPARQLParser(); |
| ParsedQuery pq1 = parser.parseQuery(query1, null); |
| ParsedQuery pq2 = parser.parseQuery(query2, null); |
| TupleExpr te1 = pq1.getTupleExpr(); |
| TupleExpr te2 = pq2.getTupleExpr(); |
| |
| TupleExpr unOpt = te1.clone(); |
| List<QueryModelNode> remainingNodes = getNodes(te1); |
| Set<QueryModelNode> unMatchedNodes = new HashSet<>(); |
| unMatchedNodes.add(remainingNodes.get(2)); |
| |
| SimpleExternalTupleSet pcj = new SimpleExternalTupleSet((Projection) te2); |
| List<ExternalTupleSet> externalList = new ArrayList<>(); |
| externalList.add(pcj); |
| |
| PCJOptimizer optimizer = new PCJOptimizer(externalList, false); |
| optimizer.optimize(te1, null, null); |
| |
| Assert.assertEquals(true, validatePcj(te1, unOpt, externalList, unMatchedNodes)); |
| |
| |
| } |
| |
| @Test |
| public void testSegmentWithUnion() throws Exception { |
| |
| String query1 = ""// |
| + "SELECT ?e ?c ?l" // |
| + "{" // |
| + " {?e <uri:p1> <uri:o1>. } UNION { ?e a ?c. OPTIONAL {?e <uri:talksTo> ?l}. ?e <uri:p5> <uri:o4>. ?e <uri:p4> <uri:o3> } . "// |
| + " ?e <uri:p2> ?c . "// |
| + " ?e <uri:p3> <uri:o2> . "// |
| + "}";// |
| |
| String query2 = ""// |
| + "SELECT ?a ?b ?m" // |
| + "{" // |
| + " ?a <uri:p5> <uri:o4> ." // |
| + " ?a <uri:p4> <uri:o3> ." // |
| + " OPTIONAL {?a <uri:talksTo> ?m} . "// |
| + " ?a a ?b . "// |
| + "}";// |
| |
| String query3 = ""// |
| + "SELECT ?h ?i" // |
| + "{" // |
| + " ?h <uri:p2> ?i . "// |
| + " ?h <uri:p3> <uri:o2> . "// |
| + "}";// |
| |
| SPARQLParser parser = new SPARQLParser(); |
| ParsedQuery pq1 = parser.parseQuery(query1, null); |
| ParsedQuery pq2 = parser.parseQuery(query2, null); |
| ParsedQuery pq3 = parser.parseQuery(query3, null); |
| TupleExpr te1 = pq1.getTupleExpr(); |
| TupleExpr te2 = pq2.getTupleExpr(); |
| TupleExpr te3 = pq3.getTupleExpr(); |
| |
| TupleExpr unOpt = te1.clone(); |
| List<QueryModelNode> remainingNodes = getNodes(te1); |
| Set<QueryModelNode> unMatchedNodes = new HashSet<>(); |
| unMatchedNodes.add(remainingNodes.get(0)); |
| |
| SimpleExternalTupleSet pcj1 = new SimpleExternalTupleSet((Projection) te2); |
| SimpleExternalTupleSet pcj2 = new SimpleExternalTupleSet((Projection) te3); |
| List<ExternalTupleSet> externalList = new ArrayList<>(); |
| externalList.add(pcj1); |
| externalList.add(pcj2); |
| |
| PCJOptimizer optimizer = new PCJOptimizer(externalList, false); |
| optimizer.optimize(te1, null, null); |
| |
| Assert.assertEquals(true, validatePcj(te1, unOpt, externalList, unMatchedNodes)); |
| |
| |
| |
| } |
| |
| @Test |
| public void testExactMatchLargeReOrdered() throws Exception { |
| |
| |
| String query1 = ""// |
| + "SELECT ?a ?b ?c ?d ?e ?f ?g ?h" // |
| + "{" // |
| + " ?a <uri:p0> ?b ." // |
| + " OPTIONAL{?b <uri:p2> ?c. ?c <uri:p1> ?d} . " // |
| + " OPTIONAL{?b <uri:p3> ?e. ?e <uri:p1> ?f} . "// |
| + " OPTIONAL{?b <uri:p4> ?g. ?g <uri:p1> ?h} . "// |
| + " OPTIONAL{?b <uri:p4> ?i. ?i <uri:p1> ?j} . "// |
| + " OPTIONAL{?b <uri:p4> ?k. ?k <uri:p1> ?l} . "// |
| + " OPTIONAL{?b <uri:p4> ?m. ?m <uri:p1> ?n} . "// |
| + " OPTIONAL{?b <uri:p4> ?o. ?o <uri:p1> ?p} . "// |
| + "}";// |
| |
| String query2 = ""// |
| + "SELECT ?a ?b ?c ?d ?e ?f ?g ?h" // |
| + "{" // |
| + " ?a <uri:p0> ?b ." // |
| + " OPTIONAL{?b <uri:p4> ?o. ?o <uri:p1> ?p} . "// |
| + " OPTIONAL{?b <uri:p4> ?g. ?g <uri:p1> ?h} . "// |
| + " OPTIONAL{?b <uri:p2> ?c. ?c <uri:p1> ?d} . " // |
| + " OPTIONAL{?b <uri:p4> ?i. ?i <uri:p1> ?j} . "// |
| + " OPTIONAL{?b <uri:p4> ?m. ?m <uri:p1> ?n} . "// |
| + " OPTIONAL{?b <uri:p4> ?k. ?k <uri:p1> ?l} . "// |
| + " OPTIONAL{?b <uri:p3> ?e. ?e <uri:p1> ?f} . "// |
| + "}";// |
| |
| SPARQLParser parser = new SPARQLParser(); |
| ParsedQuery pq1 = parser.parseQuery(query1, null); |
| ParsedQuery pq2 = parser.parseQuery(query2, null); |
| TupleExpr te1 = pq1.getTupleExpr(); |
| TupleExpr te2 = pq2.getTupleExpr(); |
| |
| TupleExpr unOpt = te1.clone(); |
| |
| SimpleExternalTupleSet pcj = new SimpleExternalTupleSet((Projection) te2); |
| List<ExternalTupleSet> externalList = new ArrayList<>(); |
| externalList.add(pcj); |
| |
| |
| PCJOptimizer optimizer = new PCJOptimizer(externalList, false); |
| optimizer.optimize(te1, null, null); |
| |
| Assert.assertEquals(true, validatePcj(te1, unOpt, externalList, new HashSet<QueryModelNode>())); |
| } |
| |
| @Test |
| public void testSubsetMatchLargeReOrdered() throws Exception { |
| |
| String query1 = ""// |
| + "SELECT ?a ?b ?c ?d ?e ?f ?g ?h" // |
| + "{" // |
| + " ?a <uri:p0> ?b ." // |
| + " OPTIONAL{?b <uri:p2> ?c. ?c <uri:p1> ?d} . " // |
| + " OPTIONAL{?b <uri:p3> ?e. ?e <uri:p1> ?f} . "// |
| + " OPTIONAL{?b <uri:p4> ?g. ?g <uri:p1> ?h} . "// |
| + " OPTIONAL{?b <uri:p5> ?i. ?i <uri:p6> ?j} . "// |
| + " OPTIONAL{?b <uri:p5> ?k. ?k <uri:p6> ?l} . "// |
| + " OPTIONAL{?b <uri:p5> ?m. ?m <uri:p6> ?n} . "// |
| + " OPTIONAL{?b <uri:p4> ?o. ?o <uri:p1> ?p} . "// |
| + "}";// |
| |
| String query2 = ""// |
| + "SELECT ?a ?b ?c ?d ?e ?f ?g ?h" // |
| + "{" // |
| + " ?a <uri:p0> ?b ." // |
| + " OPTIONAL{?b <uri:p4> ?o. ?o <uri:p1> ?p} . "// |
| + " OPTIONAL{?b <uri:p4> ?g. ?g <uri:p1> ?h} . "// |
| + " OPTIONAL{?b <uri:p2> ?c. ?c <uri:p1> ?d} . " // |
| + " OPTIONAL{?b <uri:p3> ?e. ?e <uri:p1> ?f} . "// |
| + "}";// |
| |
| SPARQLParser parser = new SPARQLParser(); |
| ParsedQuery pq1 = parser.parseQuery(query1, null); |
| ParsedQuery pq2 = parser.parseQuery(query2, null); |
| TupleExpr te1 = pq1.getTupleExpr(); |
| TupleExpr te2 = pq2.getTupleExpr(); |
| |
| TupleExpr unOpt = te1.clone(); |
| List<QueryModelNode> remainingNodes = getNodes(te1); |
| Set<QueryModelNode> unMatchedNodes = new HashSet<>(); |
| unMatchedNodes.add(remainingNodes.get(8)); |
| unMatchedNodes.add(remainingNodes.get(9)); |
| unMatchedNodes.add(remainingNodes.get(10)); |
| unMatchedNodes.add(remainingNodes.get(11)); |
| unMatchedNodes.add(remainingNodes.get(12)); |
| unMatchedNodes.add(remainingNodes.get(7)); |
| |
| SimpleExternalTupleSet pcj = new SimpleExternalTupleSet((Projection) te2); |
| List<ExternalTupleSet> externalList = new ArrayList<>(); |
| externalList.add(pcj); |
| |
| PCJOptimizer optimizer = new PCJOptimizer(externalList, false); |
| optimizer.optimize(te1, null, null); |
| |
| Assert.assertEquals(true, validatePcj(te1, unOpt, externalList, unMatchedNodes)); |
| } |
| |
| @Test |
| public void testSwitchTwoBoundVars() throws Exception { |
| |
| String query1 = ""// |
| + "SELECT ?a ?b ?c " // |
| + "{" // |
| + " ?a <uri:p0> ?c ." // |
| + " ?c <uri:p5> <uri:o5> ." // |
| + " OPTIONAL{?c <uri:p4> <uri:o4>} ." |
| + " ?b<uri:p1> ?c ." // |
| + " OPTIONAL{ ?a <uri:p1> ?b } ." // |
| + " ?a <uri:p2> <uri:o2>. " // |
| + " ?b <uri:p3> <uri:o3> " // |
| + "}";// |
| |
| String query2 = ""// |
| + "SELECT ?a ?b ?c " // |
| + "{" // |
| + " ?a <uri:p2> <uri:o2>. " // |
| + " ?b <uri:p3> <uri:o3>. " // |
| + " OPTIONAL{ ?a <uri:p1> ?b } ." // |
| + " ?a <uri:p0> ?c ." // |
| + " ?b<uri:p1> ?c " // |
| + "}";// |
| |
| SPARQLParser parser = new SPARQLParser(); |
| ParsedQuery pq1 = parser.parseQuery(query1, null); |
| ParsedQuery pq2 = parser.parseQuery(query2, null); |
| TupleExpr te1 = pq1.getTupleExpr(); |
| TupleExpr te2 = pq2.getTupleExpr(); |
| |
| TupleExpr unOpt = te1.clone(); |
| List<QueryModelNode> remainingNodes = getNodes(te1); |
| Set<QueryModelNode> unMatchedNodes = new HashSet<>(); |
| unMatchedNodes.add(remainingNodes.get(1)); |
| unMatchedNodes.add(remainingNodes.get(2)); |
| |
| SimpleExternalTupleSet pcj = new SimpleExternalTupleSet((Projection) te2); |
| List<ExternalTupleSet> externalList = new ArrayList<>(); |
| externalList.add(pcj); |
| |
| PCJOptimizer optimizer = new PCJOptimizer(externalList, false); |
| optimizer.optimize(te1, null, null); |
| |
| Assert.assertEquals(true, validatePcj(te1, unOpt, externalList, unMatchedNodes)); |
| } |
| |
| @Test |
| public void testSegmentWithLargeUnion() throws Exception { |
| |
| String query1 = ""// |
| + "SELECT ?e ?c ?l" // |
| + "{" // |
| + " {?e <uri:p1> <uri:o1>. } UNION { " // |
| + " ?e <uri:p0> ?l ." // |
| + " ?l <uri:p5> <uri:o5> ." // |
| + " OPTIONAL{?l <uri:p4> <uri:o4>} ." + " ?c<uri:p1> ?l ." // |
| + " OPTIONAL{ ?e <uri:p1> ?c } ." // |
| + " ?e <uri:p2> <uri:o2>. " // |
| + " ?c <uri:p3> <uri:o3> " // |
| + " } . "// |
| + " ?e <uri:p2> ?c . "// |
| + " ?e <uri:p3> <uri:o2> . "// |
| + "}";// |
| |
| String query2 = ""// |
| + "SELECT ?a ?b ?c " // |
| + "{" // |
| + " ?a <uri:p2> <uri:o2>. " // |
| + " ?b <uri:p3> <uri:o3>. " // |
| + " OPTIONAL{ ?a <uri:p1> ?b } ." // |
| + " ?a <uri:p0> ?c ." // |
| + " ?b<uri:p1> ?c " // |
| + "}";// |
| |
| String query3 = ""// |
| + "SELECT ?h ?i" // |
| + "{" // |
| + " ?h <uri:p2> ?i . "// |
| + " ?h <uri:p3> <uri:o2> . "// |
| + "}";// |
| |
| SPARQLParser parser = new SPARQLParser(); |
| ParsedQuery pq1 = parser.parseQuery(query1, null); |
| ParsedQuery pq2 = parser.parseQuery(query2, null); |
| ParsedQuery pq3 = parser.parseQuery(query3, null); |
| TupleExpr te1 = pq1.getTupleExpr(); |
| TupleExpr te2 = pq2.getTupleExpr(); |
| TupleExpr te3 = pq3.getTupleExpr(); |
| |
| TupleExpr unOpt = te1.clone(); |
| List<QueryModelNode> remainingNodes = getNodes(te1); |
| Set<QueryModelNode> unMatchedNodes = new HashSet<>(); |
| unMatchedNodes.add(remainingNodes.get(0)); |
| unMatchedNodes.add(remainingNodes.get(2)); |
| unMatchedNodes.add(remainingNodes.get(3)); |
| |
| SimpleExternalTupleSet pcj1 = new SimpleExternalTupleSet((Projection) te2); |
| SimpleExternalTupleSet pcj2 = new SimpleExternalTupleSet((Projection) te3); |
| List<ExternalTupleSet> externalList = new ArrayList<>(); |
| externalList.add(pcj1); |
| externalList.add(pcj2); |
| |
| PCJOptimizer optimizer = new PCJOptimizer(externalList, false); |
| optimizer.optimize(te1, null, null); |
| |
| Assert.assertEquals(true, validatePcj(te1, unOpt, externalList, unMatchedNodes)); |
| |
| } |
| |
| @Test |
| public void testSegmentWithUnionAndFilters() throws Exception { |
| |
| String query1 = ""// |
| + "SELECT ?e ?c ?l" // |
| + "{" // |
| + " Filter(?e = <uri:s1>) " // |
| + " Filter(?c = <uri:s2>) " // |
| + " {?e <uri:p1> <uri:o1>. } UNION { ?e a ?c. OPTIONAL {?e <uri:talksTo> ?l}. ?e <uri:p5> <uri:o4>. ?e <uri:p4> <uri:o3> } . "// |
| + " ?e <uri:p2> ?c . "// |
| + " ?e <uri:p3> <uri:o2> . "// |
| + "}";// |
| |
| String query2 = ""// |
| + "SELECT ?a ?b ?m" // |
| + "{" // |
| + " Filter(?b = <uri:s2>) " // |
| + " ?a <uri:p5> <uri:o4> ." // |
| + " ?a <uri:p4> <uri:o3> ." // |
| + " OPTIONAL {?a <uri:talksTo> ?m} . "// |
| + " ?a a ?b . "// |
| + "}";// |
| |
| String query3 = ""// |
| + "SELECT ?h ?i" // |
| + "{" // |
| + " Filter(?h = <uri:s1>) " // |
| + " ?h <uri:p2> ?i . "// |
| + " ?h <uri:p3> <uri:o2> . "// |
| + "}";// |
| |
| SPARQLParser parser = new SPARQLParser(); |
| ParsedQuery pq1 = parser.parseQuery(query1, null); |
| ParsedQuery pq2 = parser.parseQuery(query2, null); |
| ParsedQuery pq3 = parser.parseQuery(query3, null); |
| TupleExpr te1 = pq1.getTupleExpr(); |
| TupleExpr te2 = pq2.getTupleExpr(); |
| TupleExpr te3 = pq3.getTupleExpr(); |
| |
| TupleExpr unOpt = te1.clone(); |
| List<QueryModelNode> remainingNodes = getNodes(te1); |
| Set<QueryModelNode> unMatchedNodes = new HashSet<>(); |
| unMatchedNodes.add(remainingNodes.get(0)); |
| |
| SimpleExternalTupleSet pcj1 = new SimpleExternalTupleSet((Projection) te2); |
| SimpleExternalTupleSet pcj2 = new SimpleExternalTupleSet((Projection) te3); |
| List<ExternalTupleSet> externalList = new ArrayList<>(); |
| externalList.add(pcj1); |
| externalList.add(pcj2); |
| |
| PCJOptimizer optimizer = new PCJOptimizer(externalList, false); |
| optimizer.optimize(te1, null, null); |
| |
| Assert.assertEquals(true, validatePcj(te1, unOpt, externalList, unMatchedNodes)); |
| |
| } |
| |
| @Test |
| public void testSegmentWithLeftJoinsAndFilters() throws Exception { |
| |
| String query1 = ""// |
| + "SELECT ?e ?c ?l" // |
| + "{" // |
| + " Filter(?e = <uri:s1>) " // |
| + " Filter(?c = <uri:s2>) " // |
| + " ?e <uri:p1> <uri:o1>. " + " OPTIONAL {?e <uri:p2> ?l}. " + " ?c <uri:p3> <uri:o3> . "// |
| + " ?c <uri:p4> ?e . "// |
| + " OPTIONAL {?e <uri:p2> ?c } . "// |
| + "}";// |
| |
| String query2 = ""// |
| + "SELECT ?e ?c ?l" // |
| + "{" // |
| + " Filter(?c = <uri:s2>) " // |
| + " ?e <uri:p1> <uri:o1>. " + " OPTIONAL {?e <uri:p2> ?l}. " + " ?c <uri:p3> <uri:o3> . "// |
| + "}";// |
| |
| String query3 = ""// |
| + "SELECT ?e ?c" // |
| + "{" // |
| + " Filter(?e = <uri:s1>) " // |
| + " ?c <uri:p4> ?e . "// |
| + " OPTIONAL {?e <uri:p2> ?c } . "// |
| + "}";// |
| |
| SPARQLParser parser = new SPARQLParser(); |
| ParsedQuery pq1 = parser.parseQuery(query1, null); |
| ParsedQuery pq2 = parser.parseQuery(query2, null); |
| ParsedQuery pq3 = parser.parseQuery(query3, null); |
| TupleExpr te1 = pq1.getTupleExpr(); |
| TupleExpr te2 = pq2.getTupleExpr(); |
| TupleExpr te3 = pq3.getTupleExpr(); |
| |
| TupleExpr unOpt = te1.clone(); |
| |
| SimpleExternalTupleSet pcj1 = new SimpleExternalTupleSet((Projection) te2); |
| SimpleExternalTupleSet pcj2 = new SimpleExternalTupleSet((Projection) te3); |
| List<ExternalTupleSet> externalList = new ArrayList<>(); |
| externalList.add(pcj1); |
| externalList.add(pcj2); |
| |
| PCJOptimizer optimizer = new PCJOptimizer(externalList, false); |
| optimizer.optimize(te1, null, null); |
| |
| Assert.assertEquals(true, validatePcj(te1, unOpt, externalList, new HashSet<QueryModelNode>())); |
| } |
| |
| @Test |
| public void testJoinMatcherRejectsLeftJoinPcj() throws Exception { |
| |
| String query1 = ""// |
| + "SELECT ?e ?c ?l" // |
| + "{" // |
| + " ?e a ?c . "// |
| + " ?e <uri:talksTo> ?l . "// |
| + " ?e <http://www.w3.org/2000/01/rdf-schema#label> ?l "// |
| + "}";// |
| |
| String query2 = ""// |
| + "SELECT ?a ?b ?m" // |
| + "{" // |
| + " ?a a ?b . "// |
| + " ?a <uri:talksTo> ?m . "// |
| + " OPTIONAL {?a <http://www.w3.org/2000/01/rdf-schema#label> ?m} . "// |
| + "}";// |
| |
| SPARQLParser parser = new SPARQLParser(); |
| ParsedQuery pq1 = parser.parseQuery(query1, null); |
| ParsedQuery pq2 = parser.parseQuery(query2, null); |
| TupleExpr te1 = pq1.getTupleExpr(); |
| TupleExpr te2 = pq2.getTupleExpr(); |
| TupleExpr expected = te1.clone(); |
| |
| SimpleExternalTupleSet pcj = new SimpleExternalTupleSet((Projection) te2); |
| List<ExternalTupleSet> externalList = new ArrayList<>(); |
| externalList.add(pcj); |
| |
| PCJOptimizer optimizer = new PCJOptimizer(externalList, false); |
| optimizer.optimize(te1, null, null); |
| Assert.assertEquals(expected, te1); |
| |
| } |
| |
| |
| private List<QueryModelNode> getNodes(TupleExpr te) { |
| NodeCollector collector = new NodeCollector(); |
| te.visit(collector); |
| return collector.getNodes(); |
| } |
| |
| private boolean validatePcj(TupleExpr optTupleExp, TupleExpr unOptTup, List<ExternalTupleSet> pcjs, Set<QueryModelNode> expUnmatchedNodes) { |
| |
| IndexedExecutionPlanGenerator iep = new IndexedExecutionPlanGenerator( |
| unOptTup, pcjs); |
| List<ExternalTupleSet> indexList = iep.getNormalizedIndices(); |
| Set<QueryModelNode> indexSet = new HashSet<>(); |
| for(ExternalTupleSet etup: indexList) { |
| indexSet.add(etup); |
| } |
| |
| Set<QueryModelNode> tupNodes = Sets.newHashSet(getNodes(optTupleExp)); |
| |
| Set<QueryModelNode> diff = Sets.difference(tupNodes, indexSet); |
| return diff.equals(expUnmatchedNodes); |
| } |
| |
| |
| public static class NodeCollector extends QueryModelVisitorBase<RuntimeException> { |
| |
| List<QueryModelNode> qNodes = new ArrayList<>(); |
| |
| @Override |
| public void meetNode(final QueryModelNode node) { |
| if (node instanceof StatementPattern || node instanceof ExternalTupleSet) { |
| qNodes.add(node); |
| } |
| super.meetNode(node); |
| |
| } |
| |
| public List<QueryModelNode> getNodes() { |
| return qNodes; |
| } |
| |
| } |
| |
| } |
