Neo4j - 关系方向是否影响密码性能？

Question

Something I've always been curious about.

(Assuming you could magically flip the directions of relationships in neo4j)

Which would be faster?

START a=node(345)
MATCH (a)<-[:foo]-(b)<-[:bar]-(c)
RETURN c

or

START a=node(345)
MATCH (a)-[:foo]->(b)-[:bar]->(c)
RETURN c

Or does it not matter, as under the hood, you can traverse in either direction?

Answer 1

Found the answer in the javadocs ( http://api.neo4j.org/current/org/neo4j/graphdb/Relationship.html )

Even though all relationships have a direction they are equally well traversed in both directions so there's no need to create duplicate relationships in the opposite direction (with regard to traversal or performance).

That answers that.