Subgraph Strategy with vertexProperties + project().by("field name") = crash

Running the following query:

g.withStrategies(new SubgraphStrategy(vertexProperties: constant(true))).V().project("example").by("example")

g.withStrategies(new SubgraphStrategy(vertexProperties: constant(true))).V().project("example").by("example")

g.withStrategies(new SubgraphStrategy(vertexProperties: constant(true))).V().project("example").by("example")

g.withStrategies(new SubgraphStrategy(vertexProperties: constant(true))).V().project("example").by("example")
Results in a crash with obscure error:

org.apache.tinkerpop.gremlin.driver.exception.ResponseException: The provided traverser does not map to a value: v[122908680][CacheVertex]->[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)])]]

org.apache.tinkerpop.gremlin.driver.exception.ResponseException: The provided traverser does not map to a value: v[122908680][CacheVertex]->[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)])]]

org.apache.tinkerpop.gremlin.driver.exception.ResponseException: The provided traverser does not map to a value: v[122908680][CacheVertex]->[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)])]]

org.apache.tinkerpop.gremlin.driver.exception.ResponseException: The provided traverser does not map to a value: v[122908680][CacheVertex]->[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)])]]

At the same time, running it with

by(values("example"))

by(values("example"))

by(values("example"))

by(values("example")) finishes just fine. Why?

spmallette•4/1/23, 3:34 PM

I think you've uncovered a bug of some sort. At least you have some sort of workaround. You may track this issue here: https://issues.apache.org/jira/browse/TINKERPOP-2920

Sspmallette I think you've uncovered a bug of some sort. At least you have some sort of work...

Luna SpiritoOP•4/1/23, 4:28 PM

So, you've checked it yourself and it didn't work for you either?

spmallette•4/1/23, 4:31 PM

yep - bug

Luna SpiritoOP•4/1/23, 4:33 PM

Oh. Thank you very much.

Subgraph Strategy with vertexProperties + project().by("field name") = crash

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