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From "Matt Frantz (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TINKERPOP3-793) select should stop traversal on unproductive by
Date Sun, 02 Aug 2015 17:58:04 GMT
Matt Frantz created TINKERPOP3-793:
--------------------------------------

             Summary: select should stop traversal on unproductive by
                 Key: TINKERPOP3-793
                 URL: https://issues.apache.org/jira/browse/TINKERPOP3-793
             Project: TinkerPop 3
          Issue Type: Improvement
          Components: process
    Affects Versions: 3.0.0-incubating
            Reporter: Matt Frantz
            Assignee: Marko A. Rodriguez


Instead of throwing an exception, we should stop traversal if a {{by}} clause fails to produce.

Current:
{noformat}
gremlin> g.V().as('a').out().out().as('b')
  .select('a', 'b')
  .by('name')
  .by(has('name', 'lop').values('name'))
The provided start does not map to a value: v[5]->[HasStep([name.eq(lop)])]
{noformat}

Desired:
{noformat}
gremlin> g.V().as('a').out().out().as('b')
  .select('a', 'b')
  .by('name')
  .by(has('name', 'lop').values('name'))
==>[a:marko, b:lop]
{noformat}




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