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https://issues.apache.org/jira/browse/TINKERPOP-2854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17678848#comment-17678848
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Stephen Mallette commented on TINKERPOP-2854:
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just based on your explanation here i can't think of anything that would cause
your problem in changes made to TinkerPop. unfortunately, no one at TinkerPop
knows how the cypher transpiler works so without some specifics as to why this
would be a TinkerPop problem, i'm not sure there is much we can do to further
investigate or fix it.
> Generated Traversal differs from v3.4.13 to v3.6.1
> --------------------------------------------------
>
> Key: TINKERPOP-2854
> URL: https://issues.apache.org/jira/browse/TINKERPOP-2854
> Project: TinkerPop
> Issue Type: Bug
> Affects Versions: 3.6.1
> Reporter: Andrea Santurbano
> Priority: Major
>
> Hi everybody,
> I'm playing with Gremlin and OpenCypher query transpiler by using the
> following bytecode query:
> {code:java}
> [[], [inject( cypher.start), map([[], [project( GENERATED1, GENERATED2,
> GENERATED3), by([[], [constant(1)]]), by([[], [constant(2)]]), by([[],
> [constant(3)]]), select(values)]]), project(r), by([[], [project(
> GENERATED5, GENERATED6, GENERATED7), by([[], [identity()]]), by([[],
> [choose([[], [constant(binding[from=3])]], [[], [constant(binding[from=3])]],
> [[], [constant( cypher.null)]])]]), by([[], [choose([[],
> [constant(binding[to=1])]], [[], [constant(binding[to=1])]], [[], [constant(
> cypher.null)]])]]), select(values),
> map(lambda[cypherListSlice().apply(it)])]])]]{code}
> Using Gremlin 3.4.13 produces the following traversal:
>
>
> {code:java}
> [InjectStep([ cypher.start]), TraversalMapStep([ProjectStep([ GENERATED1,
> GENERATED2, GENERATED3],[[ConstantStep(1)], [ConstantStep(2)],
> [ConstantStep(3)]]), TraversalMapStep(values)]),
> ProjectStep([r],[[ProjectStep([ GENERATED5, GENERATED6,
> GENERATED7],[[IdentityStep], [ChooseStep([ConstantStep(3),
> HasNextStep],[[(eq(true)), [ConstantStep(3), EndStep]], [(eq(false)),
> [ConstantStep( cypher.null), EndStep]]])], [ChooseStep([ConstantStep(1),
> HasNextStep],[[(eq(true)), [ConstantStep(1), EndStep]], [(eq(false)),
> [ConstantStep( cypher.null), EndStep]]])]]), TraversalMapStep(values),
> LambdaMapStep(lambda)]])]{code}
> while 3.6.1 creates this one (we only upgraded the library and changed some
> package name references):
>
>
> {code:java}
> [InjectStep([ cypher.start]), TraversalMapStep([ProjectStep([ GENERATED1,
> GENERATED2, GENERATED3],[[ConstantStep(1)], [ConstantStep(2)],
> [ConstantStep(3)]]), TraversalMapStep(values)]),
> ProjectStep([r],[[ProjectStep([ GENERATED5, GENERATED6,
> GENERATED7],[[IdentityStep], [ChooseStep([ConstantStep(OUT),
> HasNextStep],[[(eq(true)), [ConstantStep(OUT), EndStep]], [(eq(false)),
> [ConstantStep( cypher.null), EndStep]]])], [ChooseStep([ConstantStep(IN),
> HasNextStep],[[(eq(true)), [ConstantStep(IN), EndStep]], [(eq(false)),
> [ConstantStep( cypher.null), EndStep]]])]]), TraversalMapStep(values),
> LambdaMapStep(lambda)]])]{code}
> Indeed the one in 3.6.1 is the wrong one because it adds some extra steps
> like {*}ConstantStep(IN){*}.
>
>
>
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