Pagination in Janusgraph - how do I implement traversal.next(pagesize) in Java
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Environment: Janusgraph 0.3.3 cql-es, tinkergraph 3.3.3, gremlin driver 3.3.3 with remote websocket connection and following advice from stephen mallette:
How to perform pagination in Gremlin
Following works in gremlin console:
t = g.V().hasLabel('V_USER').has('v_UserName',textContains('Frank'));
t.next(1)
However in Java the graph traversal next operation does not return vertices
GraphTraversal<Vertex,Vertex> t =
g.V().hasLabel("V_USER").has("v_UserName","textContains('Frank')");
List<Vertex> vl = t.next(10) // returns null
The GraphTraversal variable t in debug appears as follows:
[GraphStep(vertex,), HasStep([~label.eq(V_USER),
v_UserName.eq(textContains('Frank')))])]
So I assume I need to do something other than append the .next() function but I cannot figure out what. Any assistance much appreciated.
pagination gremlin janusgraph
asked Nov 25 '18 at 3:28
ptcptc
1838
add a comment |
Environment: Janusgraph 0.3.3 cql-es, tinkergraph 3.3.3, gremlin driver 3.3.3 with remote websocket connection and following advice from stephen mallette:
How to perform pagination in Gremlin
Following works in gremlin console:
t = g.V().hasLabel('V_USER').has('v_UserName',textContains('Frank'));
t.next(1)
However in Java the graph traversal next operation does not return vertices
GraphTraversal<Vertex,Vertex> t =
g.V().hasLabel("V_USER").has("v_UserName","textContains('Frank')");
List<Vertex> vl = t.next(10) // returns null
The GraphTraversal variable t in debug appears as follows:
[GraphStep(vertex,), HasStep([~label.eq(V_USER),
v_UserName.eq(textContains('Frank')))])]
So I assume I need to do something other than append the .next() function but I cannot figure out what. Any assistance much appreciated.
pagination gremlin janusgraph
asked Nov 25 '18 at 3:28
ptcptc
1838
Seems to work for me in this example. A bit surprisedt.next(10)would returnnullinstead of an empty list. Do you have a stack trace?
– Jason Plurad
Nov 26 '18 at 21:01
Thanks Jason appreciate the response and link to the example. My code was returning an empty list, the problem was with the text contains predicate which in Java needs to be Text.textContains.
– ptc
Nov 28 '18 at 19:17
add a comment |
Environment: Janusgraph 0.3.3 cql-es, tinkergraph 3.3.3, gremlin driver 3.3.3 with remote websocket connection and following advice from stephen mallette:
How to perform pagination in Gremlin
Following works in gremlin console:
t = g.V().hasLabel('V_USER').has('v_UserName',textContains('Frank'));
t.next(1)
However in Java the graph traversal next operation does not return vertices
GraphTraversal<Vertex,Vertex> t =
g.V().hasLabel("V_USER").has("v_UserName","textContains('Frank')");
List<Vertex> vl = t.next(10) // returns null
The GraphTraversal variable t in debug appears as follows:
[GraphStep(vertex,), HasStep([~label.eq(V_USER),
v_UserName.eq(textContains('Frank')))])]
So I assume I need to do something other than append the .next() function but I cannot figure out what. Any assistance much appreciated.
pagination gremlin janusgraph
asked Nov 25 '18 at 3:28
ptcptc
1838
Environment: Janusgraph 0.3.3 cql-es, tinkergraph 3.3.3, gremlin driver 3.3.3 with remote websocket connection and following advice from stephen mallette:
How to perform pagination in Gremlin
Following works in gremlin console:
t = g.V().hasLabel('V_USER').has('v_UserName',textContains('Frank'));
t.next(1)
However in Java the graph traversal next operation does not return vertices
GraphTraversal<Vertex,Vertex> t =
g.V().hasLabel("V_USER").has("v_UserName","textContains('Frank')");
List<Vertex> vl = t.next(10) // returns null
The GraphTraversal variable t in debug appears as follows:
[GraphStep(vertex,), HasStep([~label.eq(V_USER),
v_UserName.eq(textContains('Frank')))])]
So I assume I need to do something other than append the .next() function but I cannot figure out what. Any assistance much appreciated.
pagination gremlin janusgraph
pagination gremlin janusgraph
asked Nov 25 '18 at 3:28
ptcptc
1838
asked Nov 25 '18 at 3:28
ptcptc
1838
asked Nov 25 '18 at 3:28
ptcptc
1838
asked Nov 25 '18 at 3:28
ptcptc
1838
asked Nov 25 '18 at 3:28
ptcptc
1838
1838
Seems to work for me in this example. A bit surprisedt.next(10)would returnnullinstead of an empty list. Do you have a stack trace?
– Jason Plurad
Nov 26 '18 at 21:01
Thanks Jason appreciate the response and link to the example. My code was returning an empty list, the problem was with the text contains predicate which in Java needs to be Text.textContains.
– ptc
Nov 28 '18 at 19:17
add a comment |
Seems to work for me in this example. A bit surprisedt.next(10)would returnnullinstead of an empty list. Do you have a stack trace?
– Jason Plurad
Nov 26 '18 at 21:01
Thanks Jason appreciate the response and link to the example. My code was returning an empty list, the problem was with the text contains predicate which in Java needs to be Text.textContains.
– ptc
Nov 28 '18 at 19:17
Seems to work for me in this example. A bit surprised
t.next(10) would return null instead of an empty list. Do you have a stack trace?– Jason Plurad
Nov 26 '18 at 21:01
Seems to work for me in this example. A bit surprised
t.next(10) would return null instead of an empty list. Do you have a stack trace?– Jason Plurad
Nov 26 '18 at 21:01
Thanks Jason appreciate the response and link to the example. My code was returning an empty list, the problem was with the text contains predicate which in Java needs to be Text.textContains.
– ptc
Nov 28 '18 at 19:17
Thanks Jason appreciate the response and link to the example. My code was returning an empty list, the problem was with the text contains predicate which in Java needs to be Text.textContains.
– ptc
Nov 28 '18 at 19:17
add a comment |
1 Answer
1
active
oldest
votes
Problem was with text contains predicate which need to user Text.textContains function in Java, thanks to Jason Plurad for his response and example.
answered Nov 28 '18 at 19:19
ptcptc
1838
add a comment |
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Problem was with text contains predicate which need to user Text.textContains function in Java, thanks to Jason Plurad for his response and example.
answered Nov 28 '18 at 19:19
ptcptc
1838
add a comment |
Problem was with text contains predicate which need to user Text.textContains function in Java, thanks to Jason Plurad for his response and example.
answered Nov 28 '18 at 19:19
ptcptc
1838
add a comment |
Problem was with text contains predicate which need to user Text.textContains function in Java, thanks to Jason Plurad for his response and example.
answered Nov 28 '18 at 19:19
ptcptc
1838
Problem was with text contains predicate which need to user Text.textContains function in Java, thanks to Jason Plurad for his response and example.
answered Nov 28 '18 at 19:19
ptcptc
1838
answered Nov 28 '18 at 19:19
ptcptc
1838
answered Nov 28 '18 at 19:19
ptcptc
1838
answered Nov 28 '18 at 19:19
ptcptc
1838
1838
add a comment |
add a comment |
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Seems to work for me in this example. A bit surprised
t.next(10)would returnnullinstead of an empty list. Do you have a stack trace?– Jason Plurad
Nov 26 '18 at 21:01
Thanks Jason appreciate the response and link to the example. My code was returning an empty list, the problem was with the text contains predicate which in Java needs to be Text.textContains.
– ptc
Nov 28 '18 at 19:17