Github user dkuppitz commented on the pull request:
https://github.com/apache/tinkerpop/commit/e790e56aaa2118b07e36f2579502786bd9d79cc0#commitcomment-17830569
In docs/src/recipes/centrality.asciidoc:
In docs/src/recipes/centrality.asciidoc on line 75:
Because of the mid-traversal `V()` this query will not work in OLAP. If we
make it a little bit more complex, we can make it work in OLAP:
```
g.withSack(0).V().store("x").repeat(both().simplePath()).emit().path().
group().by(project("a","b").by(limit(local, 1)).
by(tail(local, 1))).
by(order().by(count(local))).
select(values).as("shortestPaths").
select("x").unfold().as("v").
select("shortestPaths").
map(unfold().filter(unfold().where(eq("v"))).count()).
sack(sum)./*barrier(normSack).*/sack().as("betweeness").
select("v","betweeness")
```
Note that I had to remove the sack normalization as it seems to be buggy
for this query (when normalized, all betweeness values become the same,
`0.1666...`)
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