barrier
Causes all steps prior to the barrier step to be executed before moving onto additional steps.
Synopsis
barrier()
Description
The barrier() step is a bulk optimizing step that can create a single traverser for a repeated step.
Examples
Repeat this traversal with the barrier() step and then without, to see the effect the barrier step has on the operation.
The basic query starts at a particular book, then traverses to the includedIn edges that point to that book to
g.V().has('book','bookId',1004).
in('includedIn').
in('includedIn').
groupCount('x').
by('name').
barrier().
project('a','b').
by('name').
by(select('x'))
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