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https://issues.apache.org/jira/browse/TINKERPOP3-511?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stephen mallette updated TINKERPOP3-511:
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Component/s: process
> New .barrier() step
> -------------------
>
> Key: TINKERPOP3-511
> URL: https://issues.apache.org/jira/browse/TINKERPOP3-511
> Project: TinkerPop 3
> Issue Type: Improvement
> Components: process
> Reporter: Daniel Kuppitz
> Fix For: 3.0.0.GA
>
>
> We need a {code}.barrier(){code} step that basically wraps
> {code}.fold().unfold(){code}.
> We came to this conclusion after discussing how we can do {code:or```}
> (union), {code}and{code} (intersect) and ultimately {code}xor{code}
> (difference). The tricky one is {code}xor{code} which currently can be
> written as:
> {code}groovy
> gremlin> g.V().has(label, "person").union(
> __.has("age", lte, 29).store("x"),
> __.has("age", gte, 29).store("y")).fold().unfold().union(
> __.except("x"),
> __.except("y"))
> ==>v[2]
> ==>v[4]
> ==>v[6]
> {{`}}
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