[Bug] g.V().outE('el0').hasLabel('el1') throws exception

[choeoe]

Bug Type (问题类型)

No response

Before submit

• 我已经确认现有的 Issues 与 FAQ 中没有相同 / 重复问题

Environment (环境信息)

• Server Version: v0.12.0
• Backend: memory
• OS: 8 CPUs, 32 G RAM, ubuntu
• Data Size: 3000 vertices, 5000 edges

Expected & Actual behavior (期望与实际表现)

The query is

g.V().outE('el0').hasLabel('el1')

• Expected result

[]

• Actual result

Exception in thread "main" java.lang.IllegalStateException: Illegal key 'LABEL' with more than one value

Vertex/Edge example (问题点 / 边数据举例)

HugeClient hugeclient = HugeClient.builder("http://localhost:8080", "hugegraph").configTimeout(3000).build();
GraphManager graph = hugeclient.graph();
Vertex vertex1 = new Vertex("vl0").property("vp0", true);
Vertex vertex2 = new Vertex("vl0").property("vp0", false);
Vertex vertex3 = new Vertex("vl0").property("vp0", true);
graph.addVertices(Arrays.asList(vertex1, vertex2, vertex3));

Edge edge1 = new Edge("el0").source(vertex1).target(vertex2).property("ep0", true);
Edge edge2 = new Edge("el1").source(vertex1).target(vertex3).property("ep1", false);
graph.addEdges(Arrays.asList(edge1, edge2));

Schema [VertexLabel, EdgeLabel, IndexLabel] (元数据结构)

HugeClient hugeclient = HugeClient.builder("http://localhost:8080", "hugegraph").configTimeout(3000).build();
hugeclient.schema().propertyKey("ep0").asBoolean().ifNotExist().create();
hugeclient.schema().propertyKey("ep1").asBoolean().ifNotExist().create();
hugeclient.schema().propertyKey("vp0").asBoolean().ifNotExist().create();

            // vertex
hugeclient.schema().vertexLabel("vl0").properties("vp0").nullableKeys("vp0").create();
hugeclient.schema().indexLabel("vl0Byvp0").onV("vl0").by("vp0").shard().ifNotExist().create();

            // edges
hugeclient.schema().edgeLabel("el0").sourceLabel("vl0").targetLabel("vl0").properties("ep0").ifNotExist().create();
hugeclient.schema().edgeLabel("el1").sourceLabel("vl0").targetLabel("vl0").properties("ep1").ifNotExist().create();
hugeclient.schema().indexLabel("el0Byep0").onE("el0").by("ep0").shard().ifNotExist().create();
hugeclient.schema().indexLabel("el1Byep0").onE("el1").by("ep1").shard().ifNotExist().create();

[zhengyingying]

I also found this bug.

I find that a closed issue (#1735) reported the same bug, and it seems to be fixed. Maybe it deserves further investigation?