Merge the results of several traversals.


union(traversal, ... )
Table 1. Legend
Syntax conventions Description
Lowercase and uppercase Literal keyword. Includes ().
Italics Variable value. Replace with a user-defined value.
[] Optional. Square brackets ( [] ) surround optional command arguments. Do not type the square brackets.
{} Group. Braces ( {} ) identify a group to choose from. Do not type the braces.
| Or. A vertical bar ( | ) separates alternative elements. Type any one of the elements. Do not type the vertical bar.
... Repeatable. An ellipsis ( ... ) indicates that you can repeat the syntax element as often as required.


The union() step is a branch step and merges the results of an arbitrary number of traversals that are specified.


Recipes reviewed by John Smith and the people he knows:
g.V().has('person','name','John Smith').union(out('reviewed'), both('knows').out('reviewed')).dedup()