Github user dkuppitz commented on a diff in the pull request:
https://github.com/apache/tinkerpop/pull/805#discussion_r172874794
--- Diff: gremlin-test/features/branch/Union.feature ---
@@ -135,7 +135,6 @@ Feature: Step - union()
| d[3].l |
| d[0].l |
| d[1.9].d |
- | d[0].i |
--- End diff --
> just so i'm clear, this value is no longer in the output because vadas
(aka v[2]) has no out edges to sum a weight on...is that right?
Exactly.
It's the same thing as doing just `g.V(2).outE()` - the traverser would
simply die as there are no outgoing edges. Likewise with
`outE().values('weight').sum()`, there simply is no sum, hence the traverser
dies.
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