Coverage Summary for Class: TestOptionalWithOrder (org.umlg.sqlg.test.gremlincompile)

Class Class, % Method, % Branch, % Line, %
TestOptionalWithOrder 100% (1/1) 100% (24/24) 68.1% (188/276) 100% (496/496)


 package org.umlg.sqlg.test.gremlincompile;
 
 import org.apache.tinkerpop.gremlin.process.traversal.Order;
 import org.apache.tinkerpop.gremlin.process.traversal.Path;
 import org.apache.tinkerpop.gremlin.process.traversal.Step;
 import org.apache.tinkerpop.gremlin.process.traversal.Traversal;
 import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.DefaultGraphTraversal;
 import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal;
 import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.__;
 import org.apache.tinkerpop.gremlin.process.traversal.step.map.OrderGlobalStep;
 import org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.IdentityStep;
 import org.apache.tinkerpop.gremlin.structure.Edge;
 import org.apache.tinkerpop.gremlin.structure.T;
 import org.apache.tinkerpop.gremlin.structure.Vertex;
 import org.junit.Assert;
 import org.junit.Test;
 import org.umlg.sqlg.step.SqlgVertexStep;
 import org.umlg.sqlg.step.barrier.SqlgOptionalStepBarrier;
 import org.umlg.sqlg.test.BaseTest;
 
 import java.util.List;
 import java.util.stream.Collectors;
 
 /**
  * Date: 2016/05/31
  * Time: 7:32 PM
  */
 public class TestOptionalWithOrder extends BaseTest {
 
     @Test
     public void testInlineOrder() {
         Vertex a1 = this.sqlgGraph.addVertex(T.label, "A", "name", "a1");
         Vertex a2 = this.sqlgGraph.addVertex(T.label, "A", "name", "a2");
         Vertex b1 = this.sqlgGraph.addVertex(T.label, "B", "name", "b1");
         this.sqlgGraph.tx().commit();
         List<Path> paths  = sqlgGraph.traversal().V(a2, a1).order().by("name").optional(__.out()).path().toList();
         Assert.assertEquals(2, paths.size());
         Assert.assertEquals(1, paths.get(0).size());
     }
 
     @Test
     public void testOrder() {
 
         Vertex a1 = sqlgGraph.addVertex(T.label, "A", "name", "a1");
         Vertex a2 = sqlgGraph.addVertex(T.label, "A", "name", "a2");
         Vertex b1 = sqlgGraph.addVertex(T.label, "B", "name", "b1");
         Vertex b2 = sqlgGraph.addVertex(T.label, "B", "name", "b2");
 
         a1.addEdge("e_a", b1);
         a2.addEdge("e_a", b2);
 
         GraphTraversal<Vertex, Path> t = sqlgGraph.traversal().V(a1, a2).order().by("name").optional(__.out()).path();
         Assert.assertTrue(t.hasNext());
         Path p = t.next();
         Assert.assertEquals(2, p.size());
         Vertex v1 = p.get(0);
         Assert.assertEquals("a1", v1.property("name").value());
         Vertex v2 = p.get(1);
         Assert.assertEquals("b1", v2.property("name").value());
         Assert.assertTrue(t.hasNext());
         p = t.next();
         Assert.assertEquals(2, p.size());
         v1 = p.get(0);
         Assert.assertEquals("a2", v1.property("name").value());
         v2 = p.get(1);
         Assert.assertEquals("b2", v2.property("name").value());
 
         b1.remove();
         this.sqlgGraph.tx().commit();
 
         List<Path> paths  = sqlgGraph.traversal().V(a2, a1).order().by("name").optional(__.out()).path().toList();
         Assert.assertEquals(2, paths.size());
         Assert.assertEquals(1, paths.get(0).size());
 
         t = sqlgGraph.traversal().V(a2, a1).order().by("name").optional(__.out()).path();
         Assert.assertTrue(t.hasNext());
         p = t.next();
         Assert.assertEquals(1, p.size());
         v1 = p.get(0);
         Assert.assertEquals("a1", v1.property("name").value());
         Assert.assertTrue(t.hasNext());
         p = t.next();
         Assert.assertEquals(2, p.size());
         v1 = p.get(0);
         Assert.assertEquals("a2", v1.property("name").value());
         v2 = p.get(1);
         Assert.assertEquals("b2", v2.property("name").value());
     }
 
     @Test
     public void testOptionalWithOrder() {
         Vertex a1 = this.sqlgGraph.addVertex(T.label, "A", "name", "a");
         Vertex a2 = this.sqlgGraph.addVertex(T.label, "A", "name", "aa");
         Vertex a3 = this.sqlgGraph.addVertex(T.label, "A", "name", "aaa");
 
         Vertex b1 = this.sqlgGraph.addVertex(T.label, "B", "name", "d");
         Vertex b2 = this.sqlgGraph.addVertex(T.label, "B", "name", "c");
         Vertex b3 = this.sqlgGraph.addVertex(T.label, "B", "name", "b");
         Vertex bb1 = this.sqlgGraph.addVertex(T.label, "BB", "name", "g");
         Vertex bb2 = this.sqlgGraph.addVertex(T.label, "BB", "name", "f");
         Vertex bb3 = this.sqlgGraph.addVertex(T.label, "BB", "name", "e");
 
         Vertex c1 = this.sqlgGraph.addVertex(T.label, "C", "name", "h");
         Vertex c2 = this.sqlgGraph.addVertex(T.label, "C", "name", "i");
         Vertex c3 = this.sqlgGraph.addVertex(T.label, "C", "name", "j");
         Vertex cc1 = this.sqlgGraph.addVertex(T.label, "CC", "name", "k");
         Vertex cc2 = this.sqlgGraph.addVertex(T.label, "CC", "name", "l");
         Vertex cc3 = this.sqlgGraph.addVertex(T.label, "CC", "name", "m");
 
         a1.addEdge("ab", b1);
         a1.addEdge("ab", b2);
         a1.addEdge("ab", b3);
         a1.addEdge("abb", bb1);
         a1.addEdge("abb", bb2);
         a1.addEdge("abb", bb3);
 
         b1.addEdge("bc", c1);
         b1.addEdge("bc", c2);
         b1.addEdge("bc", c3);
         b2.addEdge("bcc", cc1);
         b2.addEdge("bcc", cc2);
         b2.addEdge("bcc", cc3);
         this.sqlgGraph.tx().commit();
 
         DefaultGraphTraversal<Vertex, Path> traversal = (DefaultGraphTraversal<Vertex, Path>) this.sqlgGraph.traversal()
                 .V().hasLabel("A")
                 .optional(
                         __.out().order().by("name").optional(
                                 __.out().order().by("name", Order.desc)
                         )
                 )
                 .path();
         Assert.assertEquals(4, traversal.getSteps().size());
         List<Path> paths = traversal.toList();
         Assert.assertEquals(2, traversal.getSteps().size());
         assertStep(traversal.getSteps().get(0), true, true, true, true);
 
         Assert.assertEquals(12, paths.size());
 
         //assert the order
         //all the paths of length 2 and 3 must be sorted
         List<Path> pathsOfLength3 = paths.stream().filter(p -> p.size() == 3).collect(Collectors.toList());
         Vertex v = (Vertex) pathsOfLength3.get(5).objects().get(2);
         Assert.assertEquals("h", v.value("name"));
         v = (Vertex) pathsOfLength3.get(4).objects().get(2);
         Assert.assertEquals("i", v.value("name"));
         v = (Vertex) pathsOfLength3.get(3).objects().get(2);
         Assert.assertEquals("j", v.value("name"));
         v = (Vertex) pathsOfLength3.get(2).objects().get(2);
         Assert.assertEquals("k", v.value("name"));
         v = (Vertex) pathsOfLength3.get(1).objects().get(2);
         Assert.assertEquals("l", v.value("name"));
         v = (Vertex) pathsOfLength3.get(0).objects().get(2);
         Assert.assertEquals("m", v.value("name"));
 
         List<Path> pathsOfLength2 = paths.stream().filter(p -> p.size() == 2).collect(Collectors.toList());
         v = (Vertex) pathsOfLength2.get(0).objects().get(1);
         Assert.assertEquals("b", v.value("name"));
         v = (Vertex) pathsOfLength2.get(1).objects().get(1);
         Assert.assertEquals("e", v.value("name"));
         v = (Vertex) pathsOfLength2.get(2).objects().get(1);
         Assert.assertEquals("f", v.value("name"));
         v = (Vertex) pathsOfLength2.get(3).objects().get(1);
         Assert.assertEquals("g", v.value("name"));
 
         Assert.assertTrue(paths.stream().anyMatch(p -> p.size() == 3 && p.get(0).equals(a1) && p.get(1).equals(b1) && p.get(2).equals(c1)));
         paths.remove(paths.stream().filter(p -> p.size() == 3 && p.get(0).equals(a1) && p.get(1).equals(b1) && p.get(2).equals(c1)).findAny().get());
         Assert.assertTrue(paths.stream().anyMatch(p -> p.size() == 3 && p.get(0).equals(a1) && p.get(1).equals(b1) && p.get(2).equals(c2)));
         paths.remove(paths.stream().filter(p -> p.size() == 3 && p.get(0).equals(a1) && p.get(1).equals(b1) && p.get(2).equals(c2)).findAny().get());
         Assert.assertTrue(paths.stream().anyMatch(p -> p.size() == 3 && p.get(0).equals(a1) && p.get(1).equals(b1) && p.get(2).equals(c3)));
         paths.remove(paths.stream().filter(p -> p.size() == 3 && p.get(0).equals(a1) && p.get(1).equals(b1) && p.get(2).equals(c3)).findAny().get());
         Assert.assertTrue(paths.stream().anyMatch(p -> p.size() == 3 && p.get(0).equals(a1) && p.get(1).equals(b2) && p.get(2).equals(cc1)));
         paths.remove(paths.stream().filter(p -> p.size() == 3 && p.get(0).equals(a1) && p.get(1).equals(b2) && p.get(2).equals(cc1)).findAny().get());
         Assert.assertTrue(paths.stream().anyMatch(p -> p.size() == 3 && p.get(0).equals(a1) && p.get(1).equals(b2) && p.get(2).equals(cc2)));
         paths.remove(paths.stream().filter(p -> p.size() == 3 && p.get(0).equals(a1) && p.get(1).equals(b2) && p.get(2).equals(cc2)).findAny().get());
         Assert.assertTrue(paths.stream().anyMatch(p -> p.size() == 3 && p.get(0).equals(a1) && p.get(1).equals(b2) && p.get(2).equals(cc3)));
         paths.remove(paths.stream().filter(p -> p.size() == 3 && p.get(0).equals(a1) && p.get(1).equals(b2) && p.get(2).equals(cc3)).findAny().get());
 
         Assert.assertTrue(paths.stream().anyMatch(p -> p.size() == 2 && p.get(0).equals(a1) && p.get(1).equals(bb1)));
         paths.remove(paths.stream().filter(p -> p.size() == 2 && p.get(0).equals(a1) && p.get(1).equals(bb1)).findAny().get());
         Assert.assertTrue(paths.stream().anyMatch(p -> p.size() == 2 && p.get(0).equals(a1) && p.get(1).equals(bb2)));
         paths.remove(paths.stream().filter(p -> p.size() == 2 && p.get(0).equals(a1) && p.get(1).equals(bb2)).findAny().get());
         Assert.assertTrue(paths.stream().anyMatch(p -> p.size() == 2 && p.get(0).equals(a1) && p.get(1).equals(bb3)));
         paths.remove(paths.stream().filter(p -> p.size() == 2 && p.get(0).equals(a1) && p.get(1).equals(bb3)).findAny().get());
 
         Assert.assertTrue(paths.stream().anyMatch(p -> p.size() == 2 && p.get(0).equals(a1) && p.get(1).equals(b3)));
         paths.remove(paths.stream().filter(p -> p.size() == 2 && p.get(0).equals(a1) && p.get(1).equals(b3)).findAny().get());
 
         Assert.assertTrue(paths.stream().anyMatch(p -> p.size() == 1 && p.get(0).equals(a2)));
         paths.remove(paths.stream().filter(p -> p.size() == 1 && p.get(0).equals(a2)).findAny().get());
         Assert.assertTrue(paths.stream().anyMatch(p -> p.size() == 1 && p.get(0).equals(a3)));
         paths.remove(paths.stream().filter(p -> p.size() == 1 && p.get(0).equals(a3)).findAny().get());
         Assert.assertTrue(paths.isEmpty());
     }
 
     @Test
     public void testOptionalWithOrderAndRange() {
         Vertex a1 = this.sqlgGraph.addVertex(T.label, "A", "name", "a");
         Vertex a2 = this.sqlgGraph.addVertex(T.label, "A", "name", "aa");
         Vertex a3 = this.sqlgGraph.addVertex(T.label, "A", "name", "aaa");
 
         Vertex b1 = this.sqlgGraph.addVertex(T.label, "B", "name", "d");
         Vertex b2 = this.sqlgGraph.addVertex(T.label, "B", "name", "c");
         Vertex b3 = this.sqlgGraph.addVertex(T.label, "B", "name", "b");
         Vertex bb1 = this.sqlgGraph.addVertex(T.label, "BB", "name", "g");
         Vertex bb2 = this.sqlgGraph.addVertex(T.label, "BB", "name", "f");
         Vertex bb3 = this.sqlgGraph.addVertex(T.label, "BB", "name", "e");
 
         Vertex c1 = this.sqlgGraph.addVertex(T.label, "C", "name", "h");
         Vertex c2 = this.sqlgGraph.addVertex(T.label, "C", "name", "i");
         Vertex c3 = this.sqlgGraph.addVertex(T.label, "C", "name", "j");
         Vertex cc1 = this.sqlgGraph.addVertex(T.label, "CC", "name", "k");
         Vertex cc2 = this.sqlgGraph.addVertex(T.label, "CC", "name", "l");
         Vertex cc3 = this.sqlgGraph.addVertex(T.label, "CC", "name", "m");
 
         a1.addEdge("ab", b1);
         a1.addEdge("ab", b2);
         a1.addEdge("ab", b3);
         a1.addEdge("abb", bb1);
         a1.addEdge("abb", bb2);
         a1.addEdge("abb", bb3);
 
         b1.addEdge("bc", c1);
         b1.addEdge("bc", c2);
         b1.addEdge("bc", c3);
         b2.addEdge("bcc", cc1);
         b2.addEdge("bcc", cc2);
         b2.addEdge("bcc", cc3);
         this.sqlgGraph.tx().commit();
 
         DefaultGraphTraversal<Vertex, Path> traversal = (DefaultGraphTraversal<Vertex, Path>) this.sqlgGraph.traversal()
                 .V().hasLabel("A")
                 .optional(
                         __.out().order().by("name").optional(
                                 __.out().order().by("name", Order.desc).range(2, 3)
                         )
                 )
                 .path();
         Assert.assertEquals(4, traversal.getSteps().size());
         List<Path> paths = traversal.toList();
         Assert.assertEquals(2, traversal.getSteps().size());
         assertStep(traversal.getSteps().get(0), true, true, true, true);
         Assert.assertEquals(7, paths.size());
 
         //all the paths of length 2 and 3 must be sorted
         List<Path> pathsOfLength3 = paths.stream().filter(p -> p.size() == 3).collect(Collectors.toList());
         Assert.assertEquals(1, pathsOfLength3.size());
         Vertex v = (Vertex) pathsOfLength3.get(0).objects().get(2);
         Assert.assertEquals("k", v.value("name"));
 
         List<Path> pathsOfLength2 = paths.stream().filter(p -> p.size() == 2).collect(Collectors.toList());
         Assert.assertEquals(4, pathsOfLength2.size());
         v = (Vertex) pathsOfLength2.get(0).objects().get(1);
         Assert.assertEquals("b", v.value("name"));
         v = (Vertex) pathsOfLength2.get(1).objects().get(1);
         Assert.assertEquals("e", v.value("name"));
         v = (Vertex) pathsOfLength2.get(2).objects().get(1);
         Assert.assertEquals("f", v.value("name"));
         v = (Vertex) pathsOfLength2.get(3).objects().get(1);
         Assert.assertEquals("g", v.value("name"));
 
         List<Path> pathsOfLength1 = paths.stream().filter(p -> p.size() == 1).collect(Collectors.toList());
         Assert.assertEquals(2, pathsOfLength1.size());
     }
 
     @Test
     public void testOptionalWithOrderAndRange2() {
         Vertex a1 = this.sqlgGraph.addVertex(T.label, "A", "name", "a");
         Vertex a2 = this.sqlgGraph.addVertex(T.label, "A", "name", "aa");
         Vertex a3 = this.sqlgGraph.addVertex(T.label, "A", "name", "aaa");
 
         Vertex b1 = this.sqlgGraph.addVertex(T.label, "B", "name", "d");
         Vertex b2 = this.sqlgGraph.addVertex(T.label, "B", "name", "c");
         Vertex b3 = this.sqlgGraph.addVertex(T.label, "B", "name", "b");
         Vertex bb1 = this.sqlgGraph.addVertex(T.label, "BB", "name", "g");
         Vertex bb2 = this.sqlgGraph.addVertex(T.label, "BB", "name", "f");
         Vertex bb3 = this.sqlgGraph.addVertex(T.label, "BB", "name", "e");
 
         Vertex c1 = this.sqlgGraph.addVertex(T.label, "C", "name", "h");
         Vertex c2 = this.sqlgGraph.addVertex(T.label, "C", "name", "i");
         Vertex c3 = this.sqlgGraph.addVertex(T.label, "C", "name", "j");
         Vertex cc1 = this.sqlgGraph.addVertex(T.label, "CC", "name", "k");
         Vertex cc2 = this.sqlgGraph.addVertex(T.label, "CC", "name", "l");
         Vertex cc3 = this.sqlgGraph.addVertex(T.label, "CC", "name", "m");
 
         a1.addEdge("ab", b1);
         a1.addEdge("ab", b2);
         a1.addEdge("ab", b3);
         a1.addEdge("abb", bb1);
         a1.addEdge("abb", bb2);
         a1.addEdge("abb", bb3);
 
         b1.addEdge("bc", c1);
         b1.addEdge("bc", c2);
         b1.addEdge("bc", c3);
         b2.addEdge("bcc", cc1);
         b2.addEdge("bcc", cc2);
         b2.addEdge("bcc", cc3);
         this.sqlgGraph.tx().commit();
 
         DefaultGraphTraversal<Vertex, Path> traversal = (DefaultGraphTraversal<Vertex, Path>) this.sqlgGraph.traversal()
                 .V().hasLabel("A")
                 .optional(
                         __.out().order().by("name").range(1, 2).optional(
                                 __.out().order().by("name", Order.desc).range(2, 3)
                         )
                 )
                 .path();
         Assert.assertEquals(4, traversal.getSteps().size());
         List<Path> paths = traversal.toList();
         //This query is no fully optimized.
         //The range messes it up, so it has a SqlgVertexStep
         assertStep(traversal.getSteps().get(0), true, false, false, true);
         Step<?, ?> step = traversal.getSteps().get(1);
         Assert.assertTrue(step instanceof SqlgOptionalStepBarrier);
 //        SqlgOptionalStepBarrier<?,?,?> sqlgOptionalStepBarrier = (SqlgOptionalStepBarrier<?, ?, ?>) step;
         SqlgOptionalStepBarrier<?> sqlgOptionalStepBarrier = (SqlgOptionalStepBarrier<?>) step;
         Traversal.Admin<?, ?> traversal1 = sqlgOptionalStepBarrier.getLocalChildren().get(0);
         Assert.assertTrue(traversal1.getSteps().get(0) instanceof SqlgVertexStep);
         assertStep(traversal1.getSteps().get(0), false, true, true, true);
         //There is another SqlgVertexStep but it is not being asserted
 
         Assert.assertEquals(3, paths.size());
 
         List<Path> pathsOfLength1 = paths.stream().filter(p -> p.size() == 1).collect(Collectors.toList());
         Assert.assertEquals(2, pathsOfLength1.size());
 
         List<Path> pathsOfLength3 = paths.stream().filter(p -> p.size() == 3).collect(Collectors.toList());
         Assert.assertEquals(1, pathsOfLength3.size());
 
         Vertex v = (Vertex) pathsOfLength3.get(0).objects().get(2);
         Assert.assertEquals("k", v.value("name"));
     }
 
     @Test
     public void testOptionalWithOrder2() {
         Vertex a1 = this.sqlgGraph.addVertex(T.label, "A", "order", 13);
         Vertex a2 = this.sqlgGraph.addVertex(T.label, "A", "order", 12);
         Vertex a3 = this.sqlgGraph.addVertex(T.label, "A", "order", 11);
         Vertex b1 = this.sqlgGraph.addVertex(T.label, "B", "order", 3);
         Vertex b2 = this.sqlgGraph.addVertex(T.label, "B", "order", 2);
         Vertex b3 = this.sqlgGraph.addVertex(T.label, "B", "order", 1);
         a1.addEdge("ab", b1);
         a1.addEdge("ab", b2);
         a1.addEdge("ab", b3);
         this.sqlgGraph.tx().commit();
 
         DefaultGraphTraversal<Vertex, Vertex> traversal = (DefaultGraphTraversal<Vertex, Vertex>) this.sqlgGraph.traversal()
                 .V().hasLabel("A").as("a")
                 .optional(
                         __.outE().as("e").otherV().as("v")
                 ).order().by("order");
         Assert.assertEquals(4, traversal.getSteps().size());
         List<Vertex> vertices = traversal.toList();
         for (Step step : traversal.getSteps()) {
             System.out.println(step.toString());
         }
         Assert.assertEquals(3, traversal.getSteps().size());
 
         assertStep(traversal.getSteps().get(0), true, false, false, true);
 
         Assert.assertTrue(traversal.getSteps().get(1) instanceof IdentityStep);
         Assert.assertTrue(traversal.getSteps().get(2) instanceof OrderGlobalStep);
         Assert.assertEquals(5, vertices.size());
         Assert.assertEquals(b3, vertices.get(0));
         Assert.assertEquals(b2, vertices.get(1));
         Assert.assertEquals(b1, vertices.get(2));
         Assert.assertEquals(a3, vertices.get(3));
         Assert.assertEquals(a2, vertices.get(4));
     }
 
     @Test
     public void testOptionalWithOrderBy2() {
         Vertex a1 = this.sqlgGraph.addVertex(T.label, "A", "name", "a1");
         Vertex b1 = this.sqlgGraph.addVertex(T.label, "B", "name", "b1");
         Vertex b2 = this.sqlgGraph.addVertex(T.label, "B", "name", "b2");
         Vertex b3 = this.sqlgGraph.addVertex(T.label, "B", "name", "b3");
         Vertex c1 = this.sqlgGraph.addVertex(T.label, "C", "name", "c1");
         Vertex c2 = this.sqlgGraph.addVertex(T.label, "C", "name", "c2");
         Vertex c3 = this.sqlgGraph.addVertex(T.label, "C", "name", "c3");
         Vertex d1 = this.sqlgGraph.addVertex(T.label, "D", "name", "d1");
         Vertex d2 = this.sqlgGraph.addVertex(T.label, "D", "name", "d2");
         Vertex d3 = this.sqlgGraph.addVertex(T.label, "D", "name", "d3");
         Edge ab1 = a1.addEdge("ab", b1, "order", 3);
         Edge ab2 = a1.addEdge("ab", b2, "order", 2);
         Edge ab3 = a1.addEdge("ab", b3, "order", 1);
         Edge bc1 = b1.addEdge("bc", c1, "order", 3);
         Edge bc2 = b1.addEdge("bc", c2, "order", 2);
         Edge bc3 = b1.addEdge("bc", c3, "order", 1);
         Edge cd1 = c1.addEdge("cd", d1, "order", 3);
         Edge cd2 = c1.addEdge("cd", d2, "order", 2);
         Edge cd3 = c1.addEdge("cd", d3, "order", 1);
         this.sqlgGraph.tx().commit();
         DefaultGraphTraversal<Vertex, Path> traversal = (DefaultGraphTraversal<Vertex, Path>) this.sqlgGraph.traversal().V(a1.id())
                 .optional(
                         __.outE("ab").as("ab").otherV().as("vb").order().by(__.select("ab").by("order"), Order.asc)
                                 .optional(
                                         __.outE("bc").as("bc").otherV().as("vc").order().by(__.select("bc").by("order"), Order.asc)
                                                 .optional(
                                                         __.outE("cd").as("cd").inV().as("vd").order().by(__.select("cd").by("order"), Order.asc)
                                                 )
                                 )
                 )
                 .path();
 //        printTraversalForm(traversal);
         Assert.assertEquals(3, traversal.getSteps().size());
         List<Path> paths = traversal.toList();
         Assert.assertEquals(2, traversal.getSteps().size());
         assertStep(traversal.getSteps().get(0), true, true, false, true);
 
         Assert.assertEquals(7, paths.size());
         Assert.assertTrue(paths.stream().anyMatch(
                 p -> p.size() == 5 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab1) &&
                         p.get(2).equals(b1) &&
                         p.get(3).equals(bc3) &&
                         p.get(4).equals(c3)
         ));
         paths.remove(paths.stream().filter(
                 p -> p.size() == 5 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab1) &&
                         p.get(2).equals(b1) &&
                         p.get(3).equals(bc3) &&
                         p.get(4).equals(c3)
         ).findAny().get());
         Assert.assertEquals(6, paths.size());
 
         Assert.assertTrue(paths.stream().anyMatch(
                 p -> p.size() == 5 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab1) &&
                         p.get(2).equals(b1) &&
                         p.get(3).equals(bc2) &&
                         p.get(4).equals(c2)
         ));
         paths.remove(paths.stream().filter(
                 p -> p.size() == 5 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab1) &&
                         p.get(2).equals(b1) &&
                         p.get(3).equals(bc2) &&
                         p.get(4).equals(c2)
         ).findAny().get());
         Assert.assertEquals(5, paths.size());
 
         Assert.assertTrue(paths.stream().anyMatch(
                 p -> p.size() == 7 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab1) &&
                         p.get(2).equals(b1) &&
                         p.get(3).equals(bc1) &&
                         p.get(4).equals(c1) &&
                         p.get(5).equals(cd1) &&
                         p.get(6).equals(d1)
         ));
         paths.remove(paths.stream().filter(
                 p -> p.size() == 7 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab1) &&
                         p.get(2).equals(b1) &&
                         p.get(3).equals(bc1) &&
                         p.get(4).equals(c1) &&
                         p.get(5).equals(cd1) &&
                         p.get(6).equals(d1)
         ).findAny().get());
         Assert.assertEquals(4, paths.size());
 
         Assert.assertTrue(paths.stream().anyMatch(
                 p -> p.size() == 7 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab1) &&
                         p.get(2).equals(b1) &&
                         p.get(3).equals(bc1) &&
                         p.get(4).equals(c1) &&
                         p.get(5).equals(cd2) &&
                         p.get(6).equals(d2)
         ));
         paths.remove(paths.stream().filter(
                 p -> p.size() == 7 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab1) &&
                         p.get(2).equals(b1) &&
                         p.get(3).equals(bc1) &&
                         p.get(4).equals(c1) &&
                         p.get(5).equals(cd2) &&
                         p.get(6).equals(d2)
         ).findAny().get());
         Assert.assertEquals(3, paths.size());
 
         Assert.assertTrue(paths.stream().anyMatch(
                 p -> p.size() == 7 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab1) &&
                         p.get(2).equals(b1) &&
                         p.get(3).equals(bc1) &&
                         p.get(4).equals(c1) &&
                         p.get(5).equals(cd3) &&
                         p.get(6).equals(d3)
         ));
         paths.remove(paths.stream().filter(
                 p -> p.size() == 7 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab1) &&
                         p.get(2).equals(b1) &&
                         p.get(3).equals(bc1) &&
                         p.get(4).equals(c1) &&
                         p.get(5).equals(cd3) &&
                         p.get(6).equals(d3)
         ).findAny().get());
         Assert.assertEquals(2, paths.size());
 
         Assert.assertTrue(paths.stream().anyMatch(
                 p -> p.size() == 3 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab2) &&
                         p.get(2).equals(b2)
         ));
         paths.remove(paths.stream().filter(
                 p -> p.size() == 3 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab2) &&
                         p.get(2).equals(b2)
         ).findAny().get());
         Assert.assertEquals(1, paths.size());
 
         Assert.assertTrue(paths.stream().anyMatch(
                 p -> p.size() == 3 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab3) &&
                         p.get(2).equals(b3)
         ));
         paths.remove(paths.stream().filter(
                 p -> p.size() == 3 &&
                         p.get(0).equals(a1) &&
                         p.get(1).equals(ab3) &&
                         p.get(2).equals(b3)
         ).findAny().get());
         Assert.assertEquals(0, paths.size());
     }
 
     @Test
     public void testOptionalWithOrderBy3() {
         Vertex a1 = this.sqlgGraph.addVertex(T.label, "A", "name", "a1");
         Vertex a2 = this.sqlgGraph.addVertex(T.label, "A", "name", "a2");
         Vertex b1 = this.sqlgGraph.addVertex(T.label, "B", "name", "b1");
         Vertex b2 = this.sqlgGraph.addVertex(T.label, "B", "name", "b2");
         Vertex b3 = this.sqlgGraph.addVertex(T.label, "B", "name", "b3");
         Vertex b4 = this.sqlgGraph.addVertex(T.label, "B", "name", "b4");
         Vertex c1 = this.sqlgGraph.addVertex(T.label, "C", "name", "c1");
         Vertex c2 = this.sqlgGraph.addVertex(T.label, "C", "name", "c2");
         Vertex c3 = this.sqlgGraph.addVertex(T.label, "C", "name", "c3");
         Vertex d1 = this.sqlgGraph.addVertex(T.label, "D", "name", "d1");
         Vertex d2 = this.sqlgGraph.addVertex(T.label, "D", "name", "d2");
         Vertex d3 = this.sqlgGraph.addVertex(T.label, "D", "name", "d3");
         Edge ab1 = a1.addEdge("ab", b1, "order", 3);
         Edge ab2 = a1.addEdge("ab", b2, "order", 2);
         Edge ab3 = a1.addEdge("ab", b3, "order", 1);
         Edge ab4 = a2.addEdge("ab", b4, "order", 0);
 
         Edge bc1 = b1.addEdge("bc", c1, "order", 3);
         Edge bc2 = b1.addEdge("bc", c2, "order", 2);
         Edge bc3 = b1.addEdge("bc", c3, "order", 1);
         Edge cd1 = c1.addEdge("cd", d1, "order", 3);
         Edge cd2 = c1.addEdge("cd", d2, "order", 2);
         Edge cd3 = c1.addEdge("cd", d3, "order", 1);
         this.sqlgGraph.tx().commit();
         DefaultGraphTraversal<Vertex, Path> traversal = (DefaultGraphTraversal<Vertex, Path>) this.sqlgGraph.traversal().V(a1, a2)
                 .optional(
                         __.outE("ab").as("ab").otherV().as("vb").order().by(__.select("ab").by("order"), Order.asc)
                                 .optional(
                                         __.outE("bc").as("bc").otherV().as("vc").order().by(__.select("bc").by("order"), Order.asc)
                                                 .optional(
                                                         __.outE("cd").as("cd").inV().as("vd").order().by(__.select("cd").by("order"), Order.asc)
                                                 )
                                 )
                 )
                 .path();
         Assert.assertEquals(3, traversal.getSteps().size());
         List<Path> paths = traversal.toList();
         System.out.println(paths);
 
     }
 
     @Test
     public void testVertexStepAfterOptional() {
         Vertex a1 = this.sqlgGraph.addVertex(T.label, "A", "order", 1);
         Vertex b1 = this.sqlgGraph.addVertex(T.label, "B", "order", 1);
         Vertex b2 = this.sqlgGraph.addVertex(T.label, "B", "order", 1);
         Vertex b3 = this.sqlgGraph.addVertex(T.label, "B", "order", 1);
         a1.addEdge("ab", b1);
         a1.addEdge("ab", b2);
         a1.addEdge("ab", b3);
         Vertex c1 = this.sqlgGraph.addVertex(T.label, "C", "order", 1);
         Vertex c2 = this.sqlgGraph.addVertex(T.label, "C", "order", 1);
         Vertex c3 = this.sqlgGraph.addVertex(T.label, "C", "order", 1);
         b1.addEdge("bc", c1);
         b1.addEdge("bc", c2);
         b1.addEdge("bc", c3);
         Vertex d1 = this.sqlgGraph.addVertex(T.label, "D", "order", 1);
         Vertex d2 = this.sqlgGraph.addVertex(T.label, "D", "order", 2);
         Vertex d3 = this.sqlgGraph.addVertex(T.label, "D", "order", 3);
         c1.addEdge("cd", d1);
         c1.addEdge("cd", d2);
         c1.addEdge("cd", d3);
 
         Vertex a2 = this.sqlgGraph.addVertex(T.label, "A", "order", 1);
         Vertex bb1 = this.sqlgGraph.addVertex(T.label, "BB", "order", -1);
         Vertex bb2 = this.sqlgGraph.addVertex(T.label, "BB", "order", -2);
         Vertex bb3 = this.sqlgGraph.addVertex(T.label, "BB", "order", -3);
         a2.addEdge("abb", bb1);
         a2.addEdge("abb", bb2);
         a2.addEdge("abb", bb3);
         this.sqlgGraph.tx().commit();
 
         DefaultGraphTraversal<Vertex, Vertex> traversal = (DefaultGraphTraversal<Vertex, Vertex>) this.sqlgGraph.traversal()
                 .V().hasLabel("A")
                 .optional(
                         __.out("ab")
                                 .optional(
                                         __.out()
                                 )
                 )
                 .out()
                 .order().by("order", Order.desc);
 
         Assert.assertEquals(5, traversal.getSteps().size());
         List<Vertex> vertices = traversal.toList();
         Assert.assertEquals(2, traversal.getSteps().size());
         Assert.assertEquals(6, vertices.size());
         assertStep(traversal.getSteps().get(0), true, false, false, true);
 
         Assert.assertEquals(d3, vertices.get(0));
         Assert.assertEquals(d2, vertices.get(1));
         Assert.assertEquals(d1, vertices.get(2));
         Assert.assertEquals(bb1, vertices.get(3));
         Assert.assertEquals(bb2, vertices.get(4));
         Assert.assertEquals(bb3, vertices.get(5));
 
     }
 
 }