Re: [TinkerPop3] Has step got a boost!

[Jonathan Kelsey <jk...@semblent.com>]

Hi Marko,

I have a query about hasKey. From the documentation I assume it will 
exclude the traversals upon vertices or edges which do not have properties 
with keys given as arguments to hasKey. Should it work like an OR for the 
existence of property keys.
I've tried the following with Tinkerpop and Titan but it does not work as I 
expected, can anyone tell me if I'm missing something?

In 3.0.0.M9-incubating:
gremlin> graph = TinkerGraph.open()
==>tinkergraph[vertices:0 edges:0]
gremlin> moon = graph.addVertex(T.label,"moon")
==>v[0]    
gremlin> moon.property("a",1)
==>vp[a->1]
gremlin> moon.property("b",2)
==>vp[b->2]
gremlin> g = graph.traversal()
==>graphtraversalsource[tinkergraph[vertices:1 edges:0], standard]
gremlin> g.V().hasKey("a")
gremlin> g.V().hasKey("a","b")

No results from these.

In titan 0.9.0M2:
gremlin> moon = graph.addVertex(T.label,"moon")
==>v[4104]
gremlin> moon.property("a",1)
==>vp[a->1]
gremlin> moon.property("b",2)
==>vp[b->2]
gremlin> graph.tx().commit()
==>null
gremlin> g.V().hasKey("a","b")
12:31:51 WARN  com.thinkaurelius.titan.graphdb.transaction.StandardTitanTx 
 - Query requires iterating over all vertices [((~key = a OR ~key = b))]. 
For better performance, use indexes
null value for property key ~key
Display stack trace? [yN] y
java.lang.NullPointerException: null value for property key ~key
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:236)
at 
com.thinkaurelius.titan.graphdb.relations.AbstractVertexProperty.<init>(AbstractVertexProperty.java:24)
.........




On Friday, February 6, 2015 at 5:25:46 PM UTC, Marko A. Rodriguez wrote:
>
> Hello,
>
> Bryn Cooke has been pushing for hasLabel(), etc. It has been added along 
> with some other niceties -- hasValue(), hasKey(), hasId()...
>
> http://www.tinkerpop.com/docs/3.0.0-SNAPSHOT/#has-step
>
> Note that has(label,'person') still works, but we have updated all the 
> docs to use hasLabel('person'). Moreover, realize that it is generalized 
> such that:
>
> * hasLabel('person') <=> has(label,'person')
> * hasLabel('person','dog') <=> has(label,within,['person','dog'])
>
> Enjoy!,
> Marko.
>
> http://markorodriguez.com
>
>
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Re: [TinkerPop3] Has step got a boost!

[Matt Frantz <ma...@gmail.com>]

Perhaps you want to use the "has" step.

g.V().has('a')
g.V().or(has('a'), has('b'))