如何在 ArangoDB 3.2 中查询 OUT 然后 IN 遍历？

Question

I have the following graph structure. All vertexes are in the same collection, and all edges are in the same collection. From a particular start vertex (F), I want to return all the vertexes that are the result of going outwards once, then inwards once, so that I end up with, in the example, D and E.

Answer 1

Well after fooling with it for a while, this is what I came up with. Seems to work. Posting this in case someone else searches for a similar question.

 FOR v IN 1..1 OUTBOUND "Vertex/F" edges
  FOR vv IN 1..1 INBOUND v edges 
  FILTER vv._key != "F"
  Collect uniqueKeys = vv._key
  return uniqueKeys

The query take almost a millisecond for a small 8 vertex db, but I don't think I can do better.