Daniel Weber created TINKERPOP-3223:
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Summary: Argument to SubgraphStrategy.Builder.edges changes
semantics when used along vertices
Key: TINKERPOP-3223
URL: https://issues.apache.org/jira/browse/TINKERPOP-3223
Project: TinkerPop
Issue Type: Bug
Components: process
Affects Versions: 3.7.5, 3.8.0
Environment: Gremlin Console, Windows 11
GremlinServer on Docker.
Reporter: Daniel Weber
Setup: Any TinkerGraph with vertices and edges with long-Ids.
The arguments to SubgraphStrategy.Builder.vertices and edges are supposed to be
predicate-traversals, i.e. edges and vertices are only to be considered part of
the subgraph if the predicate traversal yields a result. This works for
{{g.withStrategies(SubgraphStrategy.build().vertices(id().is(lt(42L))).create()).V()
/ .E()}}
{{and}}
{{g.withStrategies(SubgraphStrategy.build().edges(id().is(lt(4L))).create()).V()
/ .E()}}
however, if used together, the edges-traversal suddenly becomes somewhat of a
failed cast on edges:
{{g.withStrategies(SubgraphStrategy.build().edges(id().is(lt(8L))).vertices(id().is(lt(4L))).create()).E()}}
yields
class java.lang.Long cannot be cast to class
org.apache.tinkerpop.gremlin.structure.Edge (java.lang.Long is in module
java.base of loader 'bootstrap'; org.apache.tinkerpop.gremlin.structure.Edge is
in unnamed module of loader 'app')
It does work, however, if the filter is made explicit:
{{g.withStrategies(SubgraphStrategy.build().edges(filter(id().is(lt(8L)))).vertices(id().is(lt(4L))).create()).E()}}
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