[jira] [Created] (TINKERPOP3-792) select at start of match traversal on Map can fail

["Matt Frantz (JIRA)" <ji...@apache.org>]

Matt Frantz created TINKERPOP3-792:
--------------------------------------

             Summary: select at start of match traversal on Map can fail
                 Key: TINKERPOP3-792
                 URL: https://issues.apache.org/jira/browse/TINKERPOP3-792
             Project: TinkerPop 3
          Issue Type: Bug
          Components: process
    Affects Versions: 3.0.0-incubating
            Reporter: Matt Frantz
            Assignee: Marko A. Rodriguez


{noformat}
g.V().valueMap()
  .match(__.as('a').select('name').as('name'))
  .select('name')
The provided match pattern is unsolvable: [[MatchStartStep(a), SelectOneStep(name), MatchEndStep(name)]]
{noformat}

What I think it happening is that the {{select}} inside the {{match}} is using {{Scope.GLOBAL}}.  The workaround is to insert {{identity}}, but I'm not sure why this works, as identity steps appear to be removed by strategy.

{noformat}
g.V().valueMap()
  .match(__.as('a').identity().select('name').as('name'))
  .select('name')
==>[marko]
==>[vadas]
==>[lop]
==>[josh]
==>[ripple]
==>[peter]
{noformat}




--
This message was sent by Atlassian JIRA
(v6.3.4#6332)