[TINKERPOP-2777] Allow `V()` to accept a traversal such as `select(<label>)`

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 3.6.1
• Component/s: process
• Assignee: Unassigned
• Reporter: Taylor Riggan
• Created: 29/Jul/22 14:03
• Updated: 29/Jul/22 14:04

Description

Users are unable to use previously fetched components of a traversal and supply them as IDs within a mid-traversal `V()` lookup.

As shown on StackOverflow:

https://stackoverflow.com/questions/73137055/how-to-select-value-to-be-the-value-in-the-property-step-in-gremlin/73138481#comment129175360_73138481

g.inject([['twitterPostId': 'tay','like': 'true','retweet': 'false'],['twitterPostId': 'fay','like': 'true','retweet': 'false' ]]).unfold()
   .V(select('twitterPostId')).fold().coalesce(}.unfold(),addV().property(t.id, select('twitterPostId').unfold())

No error is returned in this case.  The query returns zero results.

This can be repeated using the air routes dataset:

g.inject(['1','2','3']).as('a').V(select('a'))

Returns 0 results

g.V(['1','2','3'])

Returns:  

[v[1], v[2], v[3]]