Github user twilmes commented on the issue:
https://github.com/apache/tinkerpop/pull/434
This is a good batch of new work and updates. I was experimenting with the
`SubgraphStrategy` and wonder if `explain()` should be surfacing the filter
value when a `valueMap()` is used.
```
gremlin> graph = TinkerFactory.createTheCrew()
==>tinkergraph[vertices:6 edges:14]
gremlin> g = graph.traversal()
==>graphtraversalsource[tinkergraph[vertices:6 edges:14], standard]
gremlin> g =
g.withStrategies(SubgraphStrategy.build().vertexProperties(hasLabel('name')).create())
==>graphtraversalsource[tinkergraph[vertices:6 edges:14], standard]
gremlin> g.V().valueMap()
==>[name:[marko]]
==>[name:[stephen]]
==>[name:[matthias]]
==>[name:[daniel]]
==>[name:[gremlin]]
==>[name:[tinkergraph]]
gremlin> g.V().valueMap().explain()
==>Traversal Explanation
=======================================================================================
Original Traversal [GraphStep(vertex,[]),
PropertyMapStep(value)]
SubgraphStrategy [D] [GraphStep(vertex,[]),
PropertyMapStep(value)]
ConnectiveStrategy [D] [GraphStep(vertex,[]),
PropertyMapStep(value)]
RepeatUnrollStrategy [O] [GraphStep(vertex,[]),
PropertyMapStep(value)]
RangeByIsCountStrategy [O] [GraphStep(vertex,[]),
PropertyMapStep(value)]
InlineFilterStrategy [O] [GraphStep(vertex,[]),
PropertyMapStep(value)]
FilterRankingStrategy [O] [GraphStep(vertex,[]),
PropertyMapStep(value)]
MatchPredicateStrategy [O] [GraphStep(vertex,[]),
PropertyMapStep(value)]
PathRetractionStrategy [O] [GraphStep(vertex,[]),
PropertyMapStep(value)]
IncidentToAdjacentStrategy [O] [GraphStep(vertex,[]),
PropertyMapStep(value)]
AdjacentToIncidentStrategy [O] [GraphStep(vertex,[]),
PropertyMapStep(value)]
TinkerGraphStepStrategy [P] [TinkerGraphStep(vertex,[]),
PropertyMapStep(value)]
ProfileStrategy [F] [TinkerGraphStep(vertex,[]),
PropertyMapStep(value)]
StandardVerificationStrategy [V] [TinkerGraphStep(vertex,[]),
PropertyMapStep(value)]
Final Traversal [TinkerGraphStep(vertex,[]),
PropertyMapStep(value)]
```
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