Major Description
The traversal:
g.V().out().id().count()
Requires a message pass from out(). We shouldn't do this. Instead, if we wrap the pre-barrier stage into a local(), we have:
g.V().local(out().id()).count()
...which doesn't require a message pass and has the same semantics. This will help open up numerous OLAP type traversals to single-pass/non-caching scans.
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