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https://issues.apache.org/jira/browse/TINKERPOP-2920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17733492#comment-17733492
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ASF GitHub Bot commented on TINKERPOP-2920:
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spmallette opened a new pull request, #2100:
URL: https://github.com/apache/tinkerpop/pull/2100
https://issues.apache.org/jira/browse/TINKERPOP-2920
`ProductiveByStrategy` was interacting badly with `SubgraphStrategy` and
altering a child traversal in `PropertyMapStep` that it probably shouldn't have
been.
VOTE +1
> SubgraphStrategy failure when property key not present on vertex in by()
> ------------------------------------------------------------------------
>
> Key: TINKERPOP-2920
> URL: https://issues.apache.org/jira/browse/TINKERPOP-2920
> Project: TinkerPop
> Issue Type: Bug
> Components: process
> Affects Versions: 3.5.5
> Reporter: Stephen Mallette
> Priority: Minor
>
> The following triggers the failure assuming "example" isn't present on a
> vertex:
> {code}
> g.withStrategies(new SubgraphStrategy(vertexProperties: constant(true))).
> V().project("example").by("example")
> {code}
> Note that {{values('example")}} will work on 3.6.2, but not 3.5.5 which
> probably has something to do with differences in {{by()}} handling and
> {{ProductiveByStrategy}}.
> {code}
> gremlin> g.withStrategies(new SubgraphStrategy(vertexProperties:
> constant(true))).
> ......1> withoutStrategies(ProductiveByStrategy).
> ......2> V().project("example").by(values("example"))
> The provided traverser does not map to a value:
> v[1][TinkerVertex]->[PropertiesStep([example],property),
> OrStep([[ClassFilterStep(VertexProperty)],
> [TraversalFilterStep([ConstantStep(true)])]]),
> PropertyValueStep][DefaultGraphTraversal] parent[[TinkerGraphStep(vertex,[]),
> ProjectStep([example],[[PropertiesStep([example],property),
> OrStep([[ClassFilterStep(VertexProperty)],
> [TraversalFilterStep([ConstantStep(true)])]]), PropertyValueStep]])]]
> Type ':help' or ':h' for help.
> Display stack trace? [yN]
> ......1> V().project("example").by("example")
> The provided traverser does not map to a value:
> v[1][TinkerVertex]->[PropertiesStep([example],property),
> TraversalFilterStep([ConstantStep(true)]),
> OrStep([[ClassFilterStep(VertexProperty)],
> [TraversalFilterStep([ConstantStep(true)])]]),
> PropertyValueStep][DefaultTraversal]
> parent[[CoalesceStep([value([PropertiesStep([example],property),
> TraversalFilterStep([ConstantStep(true)]),
> OrStep([[ClassFilterStep(VertexProperty)],
> [TraversalFilterStep([ConstantStep(true)])]]), PropertyValueStep]), (null)])]]
> Type ':help' or ':h' for help.
> Display stack trace? [yN]
> {code}
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