[jira] [Created] (TINKERPOP-2340) MatchStep with VertexStep - Neither the sideEffects, map, nor path has a Y-key

["Anton (Jira)" <ji...@apache.org>]

Anton created TINKERPOP-2340:
--------------------------------

             Summary: MatchStep with VertexStep - Neither the sideEffects, map, nor path has a Y-key
                 Key: TINKERPOP-2340
                 URL: https://issues.apache.org/jira/browse/TINKERPOP-2340
             Project: TinkerPop
          Issue Type: Bug
    Affects Versions: 3.4.5
         Environment: TinkerPop 3.4.5
            Reporter: Anton


Using Tinkerpop Modern graph, find all pairs of people who worked on software with the same name, filtering out pairs that would bind X and Y to the same person, using MATCH traversal:

{noformat}
g.V().match(
            __.as("X").out("created").as("Z"),
            __.as("X").V().as("Y").out("created").as("V"),
            __.as("Z").values("name").as("SOFTWARE"),
            __.as("V").values("name").as("SOFTWARE"),
            __.as("X").values("name").as("DEV_X"),
            __.as("Y").values("name").as("DEV_Y")
        ).where("X", P.neq("Y"))
        .select("DEV_X", "DEV_Y", "SOFTWARE")
{noformat}

The above fails with:

{noformat}
java.lang.IllegalArgumentException: Neither the sideEffects, map, nor path has a Y-key: WherePredicateStep(neq(Y))

	at org.apache.tinkerpop.gremlin.process.traversal.step.Scoping.getScopeValue(Scoping.java:124)
	at org.apache.tinkerpop.gremlin.process.traversal.step.filter.WherePredicateStep.setPredicateValues(WherePredicateStep.java:82)
	at org.apache.tinkerpop.gremlin.process.traversal.step.filter.WherePredicateStep.filter(WherePredicateStep.java:103)
	at org.apache.tinkerpop.gremlin.process.traversal.step.filter.FilterStep.processNextStart(FilterStep.java:38)
	at org.apache.tinkerpop.gremlin.process.traversal.step.filter.WherePredicateStep.processNextStart(WherePredicateStep.java:150)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:143)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.ExpandableStepIterator.next(ExpandableStepIterator.java:50)
	at org.apache.tinkerpop.gremlin.process.traversal.step.map.MatchStep$MatchEndStep.processNextStart(MatchStep.java:569)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:143)
	at org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversal.hasNext(DefaultTraversal.java:197)
	at org.apache.tinkerpop.gremlin.process.traversal.step.map.MatchStep.standardAlgorithm(MatchStep.java:371)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.ComputerAwareStep.processNextStart(ComputerAwareStep.java:46)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.hasNext(AbstractStep.java:143)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.ExpandableStepIterator.next(ExpandableStepIterator.java:50)
	at org.apache.tinkerpop.gremlin.process.traversal.step.map.MapStep.processNextStart(MapStep.java:36)
	at org.apache.tinkerpop.gremlin.process.traversal.step.map.SelectStep.processNextStart(SelectStep.java:156)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:128)
	at org.apache.tinkerpop.gremlin.process.traversal.step.util.AbstractStep.next(AbstractStep.java:38)
	at org.apache.tinkerpop.gremlin.process.traversal.Traversal.fill(Traversal.java:181)
	at org.apache.tinkerpop.gremlin.process.traversal.Traversal.toList(Traversal.java:119)
{noformat} 

Adding an extra dedup() step makes it work:

{noformat}
g.V().match(
            __.as("X").out("created").as("Z"),
            __.as("X").V().as("Y").out("created").as("V"),
            __.as("Z").values("name").as("SOFTWARE"),
            __.as("V").values("name").as("SOFTWARE"),
            __.as("X").values("name").as("DEV_X"),
            __.as("Y").values("name").as("DEV_Y")
        ).dedup().where("X", P.neq("Y"))
        .select("DEV_X", "DEV_Y", "SOFTWARE")
{noformat}

returns:

{noformat}
{DEV_X=marko, DEV_Y=josh, SOFTWARE=lop}
{DEV_X=marko, DEV_Y=peter, SOFTWARE=lop}
{DEV_X=josh, DEV_Y=marko, SOFTWARE=lop}
{DEV_X=josh, DEV_Y=peter, SOFTWARE=lop}
{DEV_X=peter, DEV_Y=marko, SOFTWARE=lop}
{DEV_X=peter, DEV_Y=josh, SOFTWARE=lop}
{noformat}

This seems to be related to TINKERPOP-1762.



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