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https://issues.apache.org/jira/browse/TINKERPOP-968?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15128301#comment-15128301
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Marko A. Rodriguez commented on TINKERPOP-968:
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Thats a good argument. Okay, so [~pietermartin-tinkerpop], if you would like to
create a PR for {{optional(traversal)}} that would be great. Be sure to make an
{{OptionalStepTest}}, {{OptionalTest}}, {{GroovyOptionalTest}}, and add it to
the reference docs {{traversal.asciidoc}}.
Be sure to connect the tests via:
https://github.com/apache/incubator-tinkerpop/blob/master/gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/ProcessStandardSuite.java
https://github.com/apache/incubator-tinkerpop/blob/master/gremlin-test/src/main/java/org/apache/tinkerpop/gremlin/process/ProcessComputerSuite.java
https://github.com/apache/incubator-tinkerpop/blob/master/gremlin-groovy-test/src/main/java/org/apache/tinkerpop/gremlin/process/GroovyProcessStandardSuite.java
https://github.com/apache/incubator-tinkerpop/blob/master/gremlin-groovy-test/src/main/java/org/apache/tinkerpop/gremlin/process/GroovyProcessComputerSuite.java
> 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
>
> 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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