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https://issues.apache.org/jira/browse/TINKERPOP-968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15213120#comment-15213120
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ASF GitHub Bot commented on TINKERPOP-968:
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GitHub user pietermartin opened a pull request:
https://github.com/apache/incubator-tinkerpop/pull/279
Tinkerpop 968:Add first class support for an optional traversal
https://issues.apache.org/jira/browse/TINKERPOP-968
Added `optional(Traversal)` to `GraphTraversal`. Optional semantics is
implemented via the `choose` step.
Added `OptionalTest.java`
Added `Optional`-step documentation.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/apache/incubator-tinkerpop TINKERPOP-968
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/incubator-tinkerpop/pull/279.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #279
----
commit 427c3327988d83970d3191c552357d4805d01e61
Author: pieter <[email protected]>
Date: 2016-03-25T15:26:45Z
added optional to GraphTraversal
commit 2652bc2516b5408015c8daf30ac69964e3dc0dd2
Author: pieter <[email protected]>
Date: 2016-03-25T15:58:00Z
Merge branch 'master' into TINKERPOP-968
commit edc9d68234873a56bb148bd958f410d845f339de
Author: pieter <[email protected]>
Date: 2016-03-25T17:17:30Z
Merge branch 'master' into TINKERPOP-968
commit 0b6c0f41565cfc3578ca6c64447c536c4148fb4a
Author: pieter <[email protected]>
Date: 2016-03-26T16:54:04Z
Merge branch 'master' into TINKERPOP-968
----
> Add first class support for an optional traversal
> -------------------------------------------------
>
> Key: TINKERPOP-968
> URL: https://issues.apache.org/jira/browse/TINKERPOP-968
> Project: TinkerPop
> Issue Type: Improvement
> Components: process
> Affects Versions: 3.1.0-incubating
> Reporter: pieter martin
> Assignee: pieter martin
>
> Both SparQL and Cypher use the "Optional" keyword to indicate an optional
> traversal. SQL uses the "left join".
> Gremlin has no first class support for an optional traversal. It can be
> achieved with the choose step but it is verbose, unintuitive and not what the
> choose step is intended for.
> The benefits of optional traversals are many. In particular it makes it
> trivial to load complete subgraphs/trees with one easy to read intuitive
> gremlin statement.
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