[Gremlin] has and hasNot , out and outNot

[Etienne Couritas]

Hello,

I have a gremlin question.

for the graph

[class:'people', name:'robert'] --house-->[color:'blue']

[class:'people', name:'antonio']--house->[color:'yellow']

[class:'people', name:'michel']   //michel is home less

when i want to have all people with a  blue house I do

g.V.has('class','people').as('p').out('house').has('color','blue').back('p')

whit will give me [class:'people', name:'robert']

know I try to filter all people witch have not a blue house 

like it  g.V.has('class','people').as('p').out('house').hasNot('color','blue').back('p')

I would have  [class:'people', name:'antonio'] & [class:'people', name:'michel'] 

but in fact I have just [class:'people', name:'antonio']

I think it's because michel as no adjacency 'house'

So the request I just write is "all people with a none blue house" and not "all people witch have not a blue home"

How can I write such request,( I alway start with  .has('class','people'))

[Daniel Kuppitz]

Hi Etienne,

simply do the traversal within a filter step:

g.V.has('class','people').filter({ !it.out('house').has('color','blue').hasNext() })

Cheers,

Daniel

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[Etienne Couritas]

My co worker just said to me all my witch should be write which ^^

So 

[class:'people', name:'robert'] --house-->[color:'blue'] -- garden --> [style:'english garden']

[class:'people', name:'antonio']--house->[color:'yellow']

[class:'people', name:'michel'] 

all people with blue house and english garden 

g.V.has('class','people').filter({ it.out('house').has('color','blue').hasNext() }).filter({ it.out('house').out('garden').has('style','english garden').hasNext() })

all people with yellow house and not english garden 

g.V.has('class','people').filter({ it.out('house').has('color','blue').hasNext() }).filter({ !it.out('house').out('garden').has('style','english garden').hasNext() })

I think it's uglyest than with the simple out and has but I will work i thinks.

Thank you Daniel, know I need to find how write it with scala gremlin but it's another question ^^

[Daniel Kuppitz]

Don't use .filter() if it's not needed (it's slower than .has()).

g.V.has('class','people').filter({ it.out('house').has('color','blue').hasNext() }).filter({ it.out('house').out('garden').has('style','english garden').hasNext() })

can be:

g.V.has('class','people').as('p').out('house').has('color','blue').out('garden').has('style','english garden').back('p')

and

g.V.has('class','people').filter({ it.out('house').has('color','blue').hasNext() }).filter({ !it.out('house').out('garden').has('style','english garden').hasNext() })

can be:

g.V.has('class','people').as('p').out('house').has('color','blue').filter({ !it.out('garden').has('style','english garden').hasNext() }).back('p')

Cheers,

Daniel

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[Etienne Couritas]

Why it's slower and how much ?

I use un language for my query witch a convert to gremlin and I prefer generalise my code ( so write the same for the has and hasNot )

it's can be read like people.filter(house.garden.style,english garden) => which is convert to g.V.has('class','people').as('p').out('house').has('color','blue').out('garden').has('style','english garden').back('p')

so when I want to do people.exclude(house.garden.style,english garden) I would like to just have to replace the has by hasNot , in the fact I replace the has(...,Equals,...) by has(...,NotEquals,...)

But if the performances are better by using two different gremlin writing I think I should write to writing because we need performances.

ps: sorry for my english

[Daniel Kuppitz]

You can easily test performance differences in the Gremlin shell.

Here's a Gist to get you started: https://gist.github.com/dkuppitz/be88c9f92b1b45124903

Cheers,

Daniel

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[Etienne Couritas]

Twice slower :o

Indeed you convince me !

Cordialement,

Etienne Couritas
tel 06 33 82 47 62
mail e.cou...@gmail.com
addr 26 rue de visien 92400 Courbevoie

SVP, envoyez-moi un accusé de réception. Merci.
Please, send me acknowledgment of receipt. Thanks.

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[Marko Rodriguez]

Hi,

You might appreciate reading this page:

https://github.com/tinkerpop/gremlin/wiki/Gremlin-Groovy-Path-Optimizations

In Gremlin3, we have made all these "syntactic sugars" hidden from the user unless they explicitly turn on the "Sugar Plugin."

http://www.tinkerpop.com/docs/3.0.0-SNAPSHOT/#sugar-plugin

HTH,

Marko.

http://markorodriguez.com

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[Etienne Couritas]

Thank you but In my reality I use scala gremlin which use ( I think ) directly pipe.

But I think the new scala gremlin ( with tp3 ) could have a writing near the writing of groovy gremlin so benefice of the same tips than grooby gremlins