[ https://issues.apache.org/jira/browse/TINKERPOP-2095?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Daniel Kuppitz updated TINKERPOP-2095: -------------------------------------- Description: {{GroupStep}} looks for a {{Barrier}} step to determine the reducing bi-operator. This is wrong and I'm really surprised that this has never been spotted before. {noformat} gremlin> g.V().hasLabel('person').as('p').out('created').group().by('name').by(select('p').values('age').sum()) java.lang.Long cannot be cast to org.apache.tinkerpop.gremlin.process.traversal.traverser.util.TraverserSet Type ':help' or ':h' for help. Display stack trace? [yN] {noformat} In the query above the first barrier step is a {{NoOpBarrier}} step (added by {{PathRetractionStrategy}}). This step obviously has no reducing bi-operator. What we really want to do is look for the first barrier step that is not a {{LocalBarrier}} step. was: {{GroupStep}} looks for {{Barrier}} step to determine the reducing bi-operator. This is wrong and I'm really surprised that this has never been spotted before. {noformat} gremlin> g.V().hasLabel('person').as('p').out('created').group().by('name').by(select('p').values('age').sum()) java.lang.Long cannot be cast to org.apache.tinkerpop.gremlin.process.traversal.traverser.util.TraverserSet Type ':help' or ':h' for help. Display stack trace? [yN] {noformat} In the query above the first barrier step is a {{NoOpBarrier}} step (added by {{PathRetractionStrategy}}). This step obviously has no reducing bi-operator. What we really want to do is look for the first reducing barrier step. > GroupStep looks for irrelevant barrier steps > -------------------------------------------- > > Key: TINKERPOP-2095 > URL: https://issues.apache.org/jira/browse/TINKERPOP-2095 > Project: TinkerPop > Issue Type: Bug > Components: process > Affects Versions: 3.3.4 > Reporter: Daniel Kuppitz > Assignee: Daniel Kuppitz > Priority: Major > > {{GroupStep}} looks for a {{Barrier}} step to determine the reducing > bi-operator. This is wrong and I'm really surprised that this has never been > spotted before. > {noformat} > gremlin> > g.V().hasLabel('person').as('p').out('created').group().by('name').by(select('p').values('age').sum()) > java.lang.Long cannot be cast to > org.apache.tinkerpop.gremlin.process.traversal.traverser.util.TraverserSet > Type ':help' or ':h' for help. > Display stack trace? [yN] > {noformat} > In the query above the first barrier step is a {{NoOpBarrier}} step (added by > {{PathRetractionStrategy}}). This step obviously has no reducing bi-operator. > What we really want to do is look for the first barrier step that is not a > {{LocalBarrier}} step. -- This message was sent by Atlassian JIRA (v7.6.3#76005)