Daniel Kuppitz created TINKERPOP-2095:
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Summary: 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
{{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.
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