Ogre: do a query without a starting vertex

[Fairuz WAN ISMAIL]

Hi,

Let say I want find all vertices that has a name Foo and age 12.

If I understand correctly, in Gremlin, this can be done with something like:

g.V().has('name', 'Foo').has(age, 12)

In Ogre, is it correct if I say the equivalent is as below?

(q/query (v/get-all-vertices tx)

(q/has :name "Foo")

(q/has :age 12)

q/into-vec!)

I'm just worried about the performance after seeing v/get-all-vertices in the query. Will it scan all vertices for this query?

Thanks.

[Stephen Mallette]

What version of Ogre are you using? 

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[Fairuz WAN ISMAIL]

Hi,

I use Ogre 2.5.0.0

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[Stephen Mallette]

In 2.5.0.0 - something isn't clear to me.  Given:

(q/query (g/get-vertices tx)

(q/has :name "Foo")

(q/has :age 12)

q/into-vec!))

I think the problem I see is that such query won't optimize to use indices for the "has" portions.  I'm not an expert on the 2.5.0.0 code base, but I think the above is equivalent to constructing a Pipeline as below:

gremlin> new GremlinPipeline(g.getVertices()).has('name','Foo').has('age',12).toString()

==>[GremlinStartPipe, PropertyFilterPipe(name,EQUAL,Foo), PropertyFilterPipe(age,EQUAL,12)]

when you really want it to compile down to this:

gremlin> new GremlinPipeline(g).V().has('name','Foo').has('age',12).toString()

==>[GremlinStartPipe, GraphQueryPipe(has,vertex), IdentityPipe, IdentityPipe]

Perhaps someone more familiar with the Ogre 2.5.0.0 code base can shed some light on this.  I could be wrong in my interpretation.

[Fairuz WAN ISMAIL]

Anyone with Ogre 2.5.0 knowledge can shed a new light on this matter?

Thanks.