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https://issues.apache.org/jira/browse/TINKERPOP-1597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15821928#comment-15821928
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Ted Wilmes commented on TINKERPOP-1597:
---------------------------------------

The {{dedup}} step is incorrectly dropping labels because their is a bug 
related to child traversals.  I'll clean up my quick and dirty test fix and 
submit a PR.

> PathRetractionStrategy messing up certain traversals
> ----------------------------------------------------
>
>                 Key: TINKERPOP-1597
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-1597
>             Project: TinkerPop
>          Issue Type: Bug
>          Components: process
>    Affects Versions: 3.3.0
>            Reporter: Daniel Kuppitz
>            Assignee: Ted Wilmes
>
> There are certain types of traversals that do not work when 
> {{PathRetractionStrategy}} is included. This ticket discusses one specific 
> case that is only reproducible in {{3.3.0-SNAPSHOT}} / current {{master/}}.
> Here's the traversal and the expected result:
> {noformat}
> gremlin> 
> g.withoutStrategies(PathRetractionStrategy).V(1,2).as("a").optional(bothE().dedup().as("b")).choose(select("b").select("a","b").,
>  project("a").by(select("a")))
> ==>[a:v[2]]
> ==>[a:v[1],b:e[9][1-created->3]]
> ==>[a:v[1],b:e[7][1-knows->2]]
> ==>[a:v[1],b:e[8][1-knows->4]]
> {noformat}
> With {{PathRetractionStrategy}} included we get:
> {noformat}
> gremlin> 
> g.V(1,2).as("a").optional(bothE().dedup().as("b")).choose(select("b"), 
> select("a","b"), project("a").by(select("a")))
> ==>[a:v[2]]
> {noformat}
> What's interesting is, that the following 2 traversals compile to the same 
> final traversal (according to {{.explain()}}):
> {noformat}
> g.withoutStrategies(PathRetractionStrategy).V(1,2).as("a").optional(bothE().dedup().as("b")).choose(select("b").barrier(2500),
>  select("a","b").barrier(2500), project("a").by(select("a").barrier(2500)))
> g.V(1,2).as("a").optional(bothE().dedup().as("b")).choose(select("b"), 
> select("a","b"), project("a").by(select("a")))
> {noformat}
> ...but the one w/ {{PathRetractionStrategy}} still returns the wrong result, 
> while the other traversal returns the expected result.



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