[
https://issues.apache.org/jira/browse/TINKERPOP3-792?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Marko A. Rodriguez closed TINKERPOP3-792.
-----------------------------------------
Resolution: Fixed
Fix Version/s: 3.0.1-incubating
This is fixed. However, its "weird." This was the problem. All match-traversals
start with a {{MatchStartStep}}. These are {{Scoping}}. However, if someone
does {{where(neq("c"))}}, well you want {{c}} to be a scoping variable. In
{{MatchStartStep}} the scoping variables were the {{MatchStartStep}} variable
AND the scoping variables of the subsequent step (iff it is {{Scoping}}).
I made it so ONLY {{WhereTraversalStep}} and {{WherePredicateStep}} are treated
special like this. Thus, {{SelectOneStep}} and {{SelectStep}} are just normal
old "selects" in a match-pattern.
I sorta don't like the solution as its sorta ad hoc and what if people want to
"where" on the {{Map}}, not the patterns. :| .... They would have to insert an
{{identity()}}-step. Dah..............................................
However, regardless {{SelectStep}} and {{SelectOneStep}} should not be treated
special by {{MatchStep}} so we are at least off to a good start.
> 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
>
>
> {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)
