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From "Alex Baev (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TINKERPOP-2282) EdgeOtherVertexStep sometimes uses the wrong vertex to calculate otherV()
Date Thu, 15 Aug 2019 00:21:00 GMT
Alex Baev created TINKERPOP-2282:
------------------------------------

             Summary: EdgeOtherVertexStep sometimes uses the wrong vertex to calculate otherV()
                 Key: TINKERPOP-2282
                 URL: https://issues.apache.org/jira/browse/TINKERPOP-2282
             Project: TinkerPop
          Issue Type: Bug
          Components: structure
    Affects Versions: 3.4.3
            Reporter: Alex Baev


EdgeOtherVertexStep always looks for the last vertex in the path and uses that vertex to
calculate the "other" vertex (see the [code|https://github.com/apache/tinkerpop/blob/3.4.3/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/process/traversal/step/map/EdgeOtherVertexStep.java#L47]).
This implementation works most of the time, but it produces unexpected results if a different
vertex is injected into the path between the right vertex and the call to otherV(). For example:
{code:java}
gremlin> G = TinkerFactory.createModern()
gremlin> g = G.traversal()

gremlin> g.V().has('name', 'marko').outE().as('e').V().has('name', 'peter').select('e').otherV().values('name')
==>marko
==>marko
==>marko
{code}
In the example above, otherV() returns marko because the implementation applies otherV() to
V().has('name', 'peter') instead of V().has('name', 'marko')

Another example:
{code:java}
gremlin> g.V().has('name', 'marko').outE().as('e').otherV().select('e').otherV().path()
==>[v[1],e[9][1-created->3],v[3],e[9][1-created->3],v[1]]
==>[v[1],e[7][1-knows->2],v[2],e[7][1-knows->2],v[1]]
==>[v[1],e[8][1-knows->4],v[4],e[8][1-knows->4],v[1]]
{code}
The first .otherV() returns the right vertex, but the second one always returns v[1]. This
happens because the second otherV() is applied to the result returned by the first otherV(),
which seems incorrect.



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