Zheng Qin created TINKERPOP-2604:
------------------------------------
Summary: TinkerGraph could not order vertex/edge without specified
property.
Key: TINKERPOP-2604
URL: https://issues.apache.org/jira/browse/TINKERPOP-2604
Project: TinkerPop
Issue Type: Bug
Components: tinkergraph
Affects Versions: 3.4.10
Environment: Version: 3.4.10
OS : CentOS8
Storage Backend: in-memory
Reporter: Zheng Qin
h2. TinkerGraph could not order vertex/edge without specified property
h3. Environment
bq. Version: 3.4.10
bq.OS : CentOS8
bq.Storage Backend: in-memory
h3. Bug description
We expect to get the vertexes/edges ordered by their ID using gremlin *order*
query without specified property like `"g.V()/E().order().by(asc/desc)"` in
TinkerGraph, as we can get the result by the same query in JanusGraph.
h3. Current behavior
An exception was thrown:
{code:java}
java.util.concurrent.ExecutionException:
org.apache.tinkerpop.gremlin.driver.exception.ResponseException:
org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerVertex cannot be cast
to java.lang.Comparable
at
java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
at
java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1908)
at
org.gdbtesting.validation.ValidateTinkerOrderAsc.main(ValidateTinkerOrderAsc.java:27)
Caused by: org.apache.tinkerpop.gremlin.driver.exception.ResponseException:
org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerVertex cannot be cast
to java.lang.Comparable
{code}
h3. Reproduce
{code:java}
GraphTraversalSource g = connection.getG();
g.E().drop().iterate();
g.V().drop().iterate();
try {
Vertex v1 = g.addV().property("price",3).next();
Vertex v2 = g.addV().property("price",4).next();
Vertex v3 = g.addV().property("price",5).next();
Vertex v4 = g.addV().property("price",6).next();
String query = "g.V().order().by(asc)";
System.out.println("query: " + query);
try{
List<Result> results;
results = connection.getClient().submit(query).all().get();
for (Result r : results) {
System.out.println(r);
}
}catch(Exception e){
e.printStackTrace();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
System.exit(0);
}
{code}
We could successfully run the *order()* step with specified property in
TinkerGraph, like using "g.V().id().order().by(asc)" to get vertexes ordered by
vertex ID. We bring up the issue for we are wondering whether query without
specified property, like "g.V()/E().order().by(asc/desc)", is grammatically
correct or not, as we find it could be accepted in JanusGraph while get
exception above in TinkerGraph.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
