Github user dkuppitz commented on the issue:
https://github.com/apache/tinkerpop/pull/495
Since this PR touches `FilterRankingStrategyTest`s, it would be nice to
have this issue fixed as well (and have some tests added to cover this
scenario):
```
gremlin> g = TinkerFactory.createModern().traversal()
==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
gremlin> g.V(1).as("a").both().both().has("age").where(neq("a")).by("age")
The property does not exist as the key has no associated value for the
provided element: v[5]:age
Type ':help' or ':h' for help.
Display stack trace? [yN]N
gremlin>
g.V(1).as("a").both().both().has("age").where(neq("a")).by("age").explain()
==>Traversal Explanation
===========================================================================================================================================================================================================================================
Original Traversal [GraphStep(vertex,[1])@[a],
VertexStep(BOTH,vertex), VertexStep(BOTH,vertex),
TraversalFilterStep([PropertiesStep([age],value)]),
WherePredicateStep(neq(a),[value(age)])]
...
FilterRankingStrategy [O] [GraphStep(vertex,[1])@[a],
VertexStep(BOTH,vertex), VertexStep(BOTH,vertex),
WherePredicateStep(neq(a),[value(age)]),
TraversalFilterStep([PropertiesStep([age],value)])]
...
Final Traversal [TinkerGraphStep(vertex,[1])@[a],
VertexStep(BOTH,vertex), VertexStep(BOTH,vertex),
WherePredicateStep(neq(a),[value(age)]), NoOpBarrierStep(2500),
TraversalFilterStep([PropertiesStep([age],property)])]
```
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