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https://issues.apache.org/jira/browse/TINKERPOP-1867?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16318728#comment-16318728
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Daniel Kuppitz commented on TINKERPOP-1867:
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Hmm, at some point we allowed reducing barriers in {{repeat()}}, but seems it's
disallowed again in both main branches. However, allowing it produced the same
problem - empty traversers. The interesting thing about the test you've
mentioned is that it breaks if you remove just one of union's child traversals.
> union() can produce extra traversers
> -------------------------------------
>
> Key: TINKERPOP-1867
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1867
> Project: TinkerPop
> Issue Type: Bug
> Components: process
> Affects Versions: 3.2.7
> Reporter: stephen mallette
> Assignee: stephen mallette
>
> Hard to say where this bug is coming from but basically the most simple
> representation is:
> {code}
> gremlin> g.V(1,2).local(__.union(__.constant(1).count()))
> ==>1
> ==>0
> ==>1
> {code}
> Similar problems occur with {{sum()}} and other reducing barriers when used
> in this context.
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