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https://issues.apache.org/jira/browse/TINKERPOP-1711?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16117183#comment-16117183
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Daniel Kuppitz commented on TINKERPOP-1711:
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In TINKERPOP-780 you stated that "This has been fixed by saying, you can't have
a reducing barrier step be in a traversal whose parent is repeat.". Not sure
how you did this though, seems like a development branch for TINKERPOP-780
never existed. Anyway, perhaps this should be extended to more steps. "...whose
parent is repeat, union, ...."
> map(union(fold())) bug
> ----------------------
>
> Key: TINKERPOP-1711
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1711
> Project: TinkerPop
> Issue Type: Bug
> Components: process
> Affects Versions: 3.2.5
> Reporter: Robert Dale
> Assignee: Daniel Kuppitz
> Fix For: 3.2.6
>
>
> Actual:
> {code:java}
> gremlin> graph = TinkerFactory.createModern()
> ==>tinkergraph[vertices:6 edges:6]
> gremlin> g = graph.traversal()
> ==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
> gremlin> g.V().valueMap()
> ==>[name:[marko],age:[29]]
> ==>[name:[vadas],age:[27]]
> ==>[name:[lop],lang:[java]]
> ==>[name:[josh],age:[32]]
> ==>[name:[ripple],lang:[java]]
> ==>[name:[peter],age:[35]]
> gremlin> g.V().map(union(values('name'), values('lang').fold()).fold())
> ==>[marko,[]]
> ==>[[],vadas]
> ==>[lop,[java]]
> ==>[[],josh]
> ==>[ripple,[java]]
> ==>[[],peter]
> {code}
> Expected:
> {code:java}
> gremlin> g.V().map(union(values('name'), values('lang').fold()).fold())
> ==>[marko,[]]
> ==>[vadas,[]]
> ==>[lop,[java]]
> ==>[josh,[]]
> ==>[ripple,[java]]
> ==>[peter,[]]
> {code}
> List reference:
> https://groups.google.com/forum/#!topic/gremlin-users/L_fESS6ta0A
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