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

["stephen mallette (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TINKERPOP3-792?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

stephen mallette reopened TINKERPOP3-792:
-----------------------------------------

> 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
>             Fix For: 3.0.1-incubating, 3.1.0-incubating
>
>
> {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}



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