pieter martin created TINKERPOP3-968:
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Summary: Add first class support for an optional traversal
Key: TINKERPOP3-968
URL: https://issues.apache.org/jira/browse/TINKERPOP3-968
Project: TinkerPop 3
Issue Type: Improvement
Components: process
Affects Versions: 3.1.1-incubating
Reporter: pieter martin
Assignee: Marko A. Rodriguez
Both SparkQL 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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