Bryn Cooke created TINKERPOP-1415:
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Summary: Vertex programs that rely on getting path parameters
can't work
Key: TINKERPOP-1415
URL: https://issues.apache.org/jira/browse/TINKERPOP-1415
Project: TinkerPop
Issue Type: Bug
Components: process
Affects Versions: 3.2.1
Reporter: Bryn Cooke
Recently some of our vertex programs have started failing.
They rely of being able to retrieve an element out of the path.
However, whereas this used to work now the path element isn't there anymore.
The root cause is that path retraction doesn't know that the vertex program is
interested in the path and therefore culls out parameter.
I can understand why it does this, but there seems to be no way of exposing the
vertex program path requirements such that PathRetractionStrategy can pick them
up and do the right thing.
I tried hacking together a solution by making ProgramVertexProgramStep
implement Scoping. This did fix the issue, but I am not confident that this is
the way to go.
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