Andrea Santurbano created TINKERPOP-2854:
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Summary: 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
Hi everybovy,
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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