[
https://issues.apache.org/jira/browse/TINKERPOP-1428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15632901#comment-15632901
]
Marko A. Rodriguez edited comment on TINKERPOP-1428 at 11/3/16 2:36 PM:
------------------------------------------------------------------------
So, I've isolated it to {{GroupSideEffectStep}}.
{code}
gremlin> g.V().union(groupCount(),group()).profile()
==>Traversal Metrics
Step Count
Traversers Time (ms) % Dur
=============================================================================================================
TinkerGraphStep(vertex,[]) 6
6 0.083 21.89
UnionStep([[GroupCountStep, ProfileStep, EndSte... 2
2 0.297 78.11
GroupCountStep 1
1 0.037
EndStep 1
1 0.012
GroupStep([FoldStep, ProfileStep]) 1
1 0.115
FoldStep 6
6 0.050
EndStep 1
1 0.032
>TOTAL -
- 0.380 -
gremlin> g.V().union(groupCount('m'),group()).profile()
==>Traversal Metrics
Step Count
Traversers Time (ms) % Dur
=============================================================================================================
TinkerGraphStep(vertex,[]) 6
6 0.055 11.83
UnionStep([[GroupCountSideEffectStep(m), Profil... 7
7 0.415 88.17
GroupCountSideEffectStep(m) 6
6 0.104
EndStep 6
6 0.025
GroupStep([FoldStep, ProfileStep]) 1
1 0.110
FoldStep 6
6 0.044
EndStep 1
1 0.039
>TOTAL -
- 0.470 -
gremlin> g.V().union(groupCount(),group('m')).profile()
java.lang.NullPointerException
Type ':help' or ':h' for help.
Display stack trace? [yN]
{code}
And it behaves the same with {{choose()}}, {{repeat()}}, etc.
{code}
gremlin> g.V().repeat(group('m')).times(2).profile()
java.lang.NullPointerException
Type ':help' or ':h' for help.
Display stack trace? [yN]
{code}
was (Author: okram):
So, I've isolated it to `GroupSideEffectStep`.
```
gremlin> g.V().union(groupCount(),group()).profile()
==>Traversal Metrics
Step Count
Traversers Time (ms) % Dur
=============================================================================================================
TinkerGraphStep(vertex,[]) 6
6 0.083 21.89
UnionStep([[GroupCountStep, ProfileStep, EndSte... 2
2 0.297 78.11
GroupCountStep 1
1 0.037
EndStep 1
1 0.012
GroupStep([FoldStep, ProfileStep]) 1
1 0.115
FoldStep 6
6 0.050
EndStep 1
1 0.032
>TOTAL -
- 0.380 -
gremlin> g.V().union(groupCount('m'),group()).profile()
==>Traversal Metrics
Step Count
Traversers Time (ms) % Dur
=============================================================================================================
TinkerGraphStep(vertex,[]) 6
6 0.055 11.83
UnionStep([[GroupCountSideEffectStep(m), Profil... 7
7 0.415 88.17
GroupCountSideEffectStep(m) 6
6 0.104
EndStep 6
6 0.025
GroupStep([FoldStep, ProfileStep]) 1
1 0.110
FoldStep 6
6 0.044
EndStep 1
1 0.039
>TOTAL -
- 0.470 -
gremlin> g.V().union(groupCount(),group('m')).profile()
java.lang.NullPointerException
Type ':help' or ':h' for help.
Display stack trace? [yN]
```
And it behaves the same with `choose()`, `repeat()`, etc.
```
gremlin> g.V().repeat(group('m')).times(2).profile()
java.lang.NullPointerException
Type ':help' or ':h' for help.
Display stack trace? [yN]
```
> profile() throws NPE for union(group, group)
> --------------------------------------------
>
> Key: TINKERPOP-1428
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1428
> Project: TinkerPop
> Issue Type: Bug
> Components: process
> Affects Versions: 3.2.1
> Reporter: Daniel Kuppitz
>
> {noformat}
> gremlin> g.V().union(group("m").by("name"), group("m").by("name")).profile()
> java.lang.NullPointerException
> Type ':help' or ':h' for help.
> Display stack trace? [yN]y
> java.lang.NullPointerException
> at
> org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversalMetrics.handleNestedTraversals(DefaultTraversalMetrics.java:239)
> at
> org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversalMetrics.handleNestedTraversals(DefaultTraversalMetrics.java:251)
> at
> org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversalMetrics.handleNestedTraversals(DefaultTraversalMetrics.java:254)
> at
> org.apache.tinkerpop.gremlin.process.traversal.util.DefaultTraversalMetrics.setMetrics(DefaultTraversalMetrics.java:204)
> at
> org.apache.tinkerpop.gremlin.process.traversal.step.sideEffect.ProfileSideEffectStep.hasNext(ProfileSideEffectStep.java:73)
> at
> org.apache.tinkerpop.gremlin.process.traversal.step.util.ExpandableStepIterator.hasNext(ExpandableStepIterator.java:42)
> at
> org.apache.tinkerpop.gremlin.process.traversal.step.util.SupplyingBarrierStep.processAllStarts(SupplyingBarrierStep.java:83)
> at
> org.apache.tinkerpop.gremlin.process.traversal.step.util.SupplyingBarrierStep.processNextStart(SupplyingBarrierStep.java:70)
> 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:179)
> at
> org.apache.tinkerpop.gremlin.console.Console$_closure3.doCall(Console.groovy:226)
> at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
> at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
> at
> org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
> at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1024)
> at
> org.codehaus.groovy.tools.shell.Groovysh.setLastResult(Groovysh.groovy:446)
> at org.codehaus.groovy.tools.shell.Groovysh.execute(Groovysh.groovy:190)
> at
> org.apache.tinkerpop.gremlin.console.GremlinGroovysh.super$3$execute(GremlinGroovysh.groovy)
> at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
> at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
> at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1215)
> at
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:132)
> at
> org.apache.tinkerpop.gremlin.console.GremlinGroovysh.execute(GremlinGroovysh.groovy:72)
> at org.codehaus.groovy.tools.shell.Shell.leftShift(Shell.groovy:122)
> at org.codehaus.groovy.tools.shell.ShellRunner.work(ShellRunner.groovy:95)
> at
> org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$work(InteractiveShellRunner.groovy)
> at sun.reflect.GeneratedMethodAccessor38.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
> at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
> at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1215)
> at
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:132)
> at
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:152)
> at
> org.codehaus.groovy.tools.shell.InteractiveShellRunner.work(InteractiveShellRunner.groovy:124)
> at org.codehaus.groovy.tools.shell.ShellRunner.run(ShellRunner.groovy:59)
> at
> org.codehaus.groovy.tools.shell.InteractiveShellRunner.super$2$run(InteractiveShellRunner.groovy)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
> at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
> at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1215)
> at
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:132)
> at
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:152)
> at
> org.codehaus.groovy.tools.shell.InteractiveShellRunner.run(InteractiveShellRunner.groovy:83)
> at
> org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232)
> at org.apache.tinkerpop.gremlin.console.Console.<init>(Console.groovy:152)
> at
> org.codehaus.groovy.vmplugin.v7.IndyInterface.selectMethod(IndyInterface.java:232)
> at org.apache.tinkerpop.gremlin.console.Console.main(Console.groovy:449)
> {noformat}
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