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https://issues.apache.org/jira/browse/TINKERPOP3-793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14651890#comment-14651890
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Marko A. Rodriguez commented on TINKERPOP3-793:
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I think we can do this. Just to be clear and consistent, in {{SelectStep}} now,
if there is not "a" (lets say), then what do we do? Stop the traversal, or just
drop that "row." I remember it use to throw an exception, but we changed it.
Whatever we changed it to is what we should do for this situation.
> 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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