[TINKERPOP-620] Commutative Step Marker interface

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Won't Do
• Affects Version/s: 3.0.2-incubating
• Component/s: process
• Assignee: Unassigned
• Reporter: Matthias Broecheler
• Created: 09/Apr/15 00:23
• Updated: 15/Feb/18 14:03
• Resolved: 15/Feb/18 14:03

Description

Some steps can be reordered, i.e. they are commutative. For instance, has-steps can be reordered without affecting the pipeline. When writing a query optimizer I am often in a situation where I can only optimize a subset of the supported steps and I might want to reorder them so that I can group all the optimizable steps together. Currently, I have to manually identify the commutative steps for that. It would be much nicer if TinkerPop could have a "Commutative" marker interface for that and use it consistently.