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https://issues.apache.org/jira/browse/TINKERPOP-1992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16555871#comment-16555871
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Daniel Kuppitz commented on TINKERPOP-1992:
-------------------------------------------
It actually happens to any reducing step in {{group()}}'s value selector.
{code}
gremlin> g.V().group().by().by(bothE().fold()).profile()
==>Traversal Metrics
Step Count
Traversers Time (ms) % Dur
=============================================================================================================
TinkerGraphStep(vertex,[]) 6
6 0.053 13.94
GroupStep(identity,[VertexStep(BOTH,edge), Prof... 1
1 0.329 86.06
VertexStep(BOTH,edge) 12
12 0.084
FoldStep 6
6 -0.063
>TOTAL -
- 0.383 -
gremlin> g.V().group().by().by(bothE().values('weight').sum()).profile()
==>Traversal Metrics
Step Count
Traversers Time (ms) % Dur
=============================================================================================================
TinkerGraphStep(vertex,[]) 6
6 0.058 10.54
GroupStep(identity,[VertexStep(BOTH,edge), Prof... 1
1 0.492 89.46
VertexStep(BOTH,edge) 12
12 0.104
PropertiesStep([weight],value) 12
12 0.086
SumGlobalStep 6
6 -0.160
>TOTAL -
- 0.550 -
{code}
> count has negative time in profile
> ----------------------------------
>
> Key: TINKERPOP-1992
> URL: https://issues.apache.org/jira/browse/TINKERPOP-1992
> Project: TinkerPop
> Issue Type: Bug
> Components: process
> Affects Versions: 3.3.3, 3.2.9
> Reporter: Robert Dale
> Priority: Minor
>
> {noformat}
> gremlin> g.V().group().by().by(bothE().count()).profile()
> ==>Traversal Metrics
> Step Count
> Traversers Time (ms) % Dur
> =============================================================================================================
> TinkerGraphStep(vertex,[]) 19172
> 19172 4.957 5.24
> GroupStep(identity,[VertexStep(BOTH,edge), Prof... 1
> 1 89.696 94.76
> VertexStep(BOTH,edge) 84812
> 84812 50.723
> CountGlobalStep 19172
> 19172 -39.649
> >TOTAL -
> - 94.654 -
> {noformat}
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