Gremlin Python Search node based on Regex in node Property

[Debasish Kanhar]

Hi all,

I'm pretty new to Gremlin Python so all this question might seem trivial:

So, I have a graph pushed, and have setup connection with it.

I run the following:

 g.V().hasLabel('CASE_REQUEST_ID').valueMap()

It outputs as 

==>[NodeProperty:[nan],id:[d81f011b-23cd-4013-90a0-8fd9319a7ac0],value:[{'CASE_REQUEST_ID': '5236', 'ENTITY_NAME': 'Microsoft'}]]

==>[NodeProperty:[nan],id:[7936a098-8b38-4122-86d9-bb0ee3ac69c7],value:[{'CASE_REQUEST_ID': '5236', 'ENTITY_NAME': 'Microsoft'}]]

==>[NodeProperty:[nan],id:[307fa5ef-b0cc-4fe6-a61c-39eccfa88c6d],value:[{'CASE_REQUEST_ID': '5236', 'ENTITY_NAME': 'Microsoft'}]]

What I want to do is fetch all nodes having "{'CASE_REQUEST_ID': '5236'" in its value.

I was able to do that from Gremlin Shell by starting bin/gremlin.sh

 g.V().has('value', Text.textContains('CASE_REQUEST_ID': '5236'))

Returns me:

==>v[368660512]

==>v[204812520]

==>v[204882120]

==>v[245764296]

==>v[204808408]

But how do I implement same query using Gremlin python, GLV variant?

Using Gremlin+Python I can do g.V().hasLabel(label).has(property_name, property_value).next() to get values based on absolute matches but how to handle partial matches?

If GLV can't tackle such problem, then what other should I use to resolve such issues.?

Thanks

Debasish

[Stephen Mallette]

Text.textContains() is something specific to JanusGraph. You would have to revert to submitting a Gremlin string in that case as gremlin-python doesn't know anything about provider specific language additions so it can't generate the appropriate bytecode to send to the server. 

I don't think we've had any discussion on how best to address this issue. Ultimately, it might be up to providers to supply the appropriate extensions to the GLVs in their own packaging. In this case, JanusGraph would minimally need to provide a serializer that can convert the Text.textContains() into their predicate. You would register that serializer with gremlin server. The client side would require the python serializer as well as support for Text in the python language.

I can't immediately think of anything that would make this any much easier for providers or users. I thought a lambda solution might work:

http://tinkerpop.apache.org/docs/current/reference/#_the_lambda_solution_2

but that won't help JanusGraph optimize the traversal in any way even if you could use the Text predicate because JansuGraph can't analyze the contents of a lambda. 

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[Robert Dale]

Is script submission out for GLVs?  I didn't see it in the docs.

Robert Dale

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[Stephen Mallette]

all GLVs come with a driver that allows for script submission - that's all i meant:

http://tinkerpop.apache.org/docs/current/reference/#connecting-via-python

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[Robert Dale]

Ah, there it is. I keep forgetting that 'remote clients' and GLVs are considered as vastly different beasts and in completely different sections.  I think it's confusing.

Robert Dale

Robert Dale

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Robert Dale

[Stephen Mallette]

It would be nice if that whole body of work was revamped in a more cohesive way. I sense it's not just a cut/paste job. :/

Robert Dale

Robert Dale

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