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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TINKERPOP-2230) match() step unexpected behaviours
Date Tue, 04 Jun 2019 14:52:00 GMT

    [ https://issues.apache.org/jira/browse/TINKERPOP-2230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16855781#comment-16855781
] 

ASF GitHub Bot commented on TINKERPOP-2230:
-------------------------------------------

dkuppitz commented on pull request #1124: TINKERPOP-2230 Fixed bug in match() step
URL: https://github.com/apache/tinkerpop/pull/1124
 
 
   https://issues.apache.org/jira/browse/TINKERPOP-2230
   
   Fixed a bug where `MatchStep()` didn't determine the correct start step properly.
   
   **Before**
   ```
   gremlin> g.V().match(
   ......1>     __.as('a').out('knows').as('b'),
   ......2>     __.as('b').out('created').as('c'))
   ==>[a:v[1],b:v[4],c:v[5]]
   ==>[a:v[1],b:v[4],c:v[3]]
   gremlin> g.V().match(
   ......1>     __.as('b').out('created').as('c'),
   ......2>     __.as('a').out('knows').as('b'))
   The provided match pattern is unsolvable: [[MatchStartStep(a), VertexStep(OUT,[knows],vertex),
MatchEndStep(b)], [MatchStartStep(b), VertexStep(OUT,[created],vertex), MatchEndStep(c)]]
   ```
   
   **Now**
   ```
   gremlin> g.V().match(
   ......1>     __.as('a').out('knows').as('b'),
   ......2>     __.as('b').out('created').as('c'))
   ==>[a:v[1],b:v[4],c:v[5]]
   ==>[a:v[1],b:v[4],c:v[3]]
   gremlin> g.V().match(
   ......1>     __.as('b').out('created').as('c'),
   ......2>     __.as('a').out('knows').as('b'))
   ==>[a:v[1],b:v[4],c:v[5]]
   ==>[a:v[1],b:v[4],c:v[3]]
   ```
   
   `docker/build.sh -t -i` passed.
   
   VOTE +1
 
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> match() step unexpected behaviours
> ----------------------------------
>
>                 Key: TINKERPOP-2230
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-2230
>             Project: TinkerPop
>          Issue Type: Bug
>          Components: process
>    Affects Versions: 3.4.1
>            Reporter: Fabio Lorenzi
>            Assignee: Daniel Kuppitz
>            Priority: Major
>              Labels: gremlin
>
> On the well known software graph:
> {code:java}
> gremlin> g.V().match(
> ......1>     __.as('a').out('knows').as('b'),
> ......2>     __.as('b').out('created').as('c'))
> ==>[a:v[1],b:v[4],c:v[5]]
> ==>[a:v[1],b:v[4],c:v[3]]
> gremlin> g.V().match(
> ......1>     __.as('b').out('created').as('c'),
> ......2>     __.as('a').out('knows').as('b'))
> The provided match pattern is unsolvable: [[MatchStartStep(a), VertexStep(OUT,[knows],vertex),
MatchEndStep(b)], [MatchStartStep(b), VertexStep(OUT,[created],vertex), MatchEndStep(c)]]
> {code}
> with the second one being solvable as well (I think). (?)
> Quoting [~dkuppitz]:
> "I just noticed that the error message of my failing traversal actually contains a solvable
form of patterns. It's really confusing; if you want, create a Jira ticket for that issue,
perhaps someone dares to analyze that crazy code"
> please see [this|https://stackoverflow.com/questions/56218188/match-clause-is-unsolvable-behavior-is-not-clear/56260508#56260508]
for more information.



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