Major Description
The can be a significant difference in performance depending on whether you use by(id) or by(id()):
gremlin> g.V().out().in().path().by(id()).profile()
==>Traversal Metrics
Step Count Traversers Time (ms) % Dur
=============================================================================================================
TinkerGraphStep(vertex,[]) 6 6 12.137 58.03
VertexStep(OUT,vertex) 6 6 1.345 6.43
VertexStep(IN,vertex) 12 12 0.861 4.12
PathStep([[IdStep, ProfileStep]]) 12 12 6.570 31.42
IdStep 36 36 0.452
>TOTAL - - 20.916 -
gremlin> g.V().out().in().path().by(id).profile()
==>Traversal Metrics
Step Count Traversers Time (ms) % Dur
=============================================================================================================
TinkerGraphStep(vertex,[]) 6 6 0.876 11.54
VertexStep(OUT,vertex) 6 6 0.714 9.40
VertexStep(IN,vertex) 12 12 3.299 43.43
PathStep([id]) 12 12 2.706 35.63
>TOTAL - - 7.596 -
We should have a strategy that rewrites these simple patterns. This affects id(), label(), key(), value(), but also by(values("name")), which can be rewritten as by("name")
