neo4j - Determine the Longest Unidirectional Path in a Directed Disconnected Graph -

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I have a disconnected graph in which some nodes can be connected to a variety of multiple unidirectional relationships. It is possible that there are loops in the graph.

How can I determine the length of the longest unidirectional path in my graph? I am trying the following questions without following success: 

  START n = node (*) MATCH P = N & lt; Path in the form of a collection (P) as MAX (length (P)) AS XLLMB Return Filter (path in path where the length (path) = maximum lamp) in advance

thanks,

about it: 

  MATCH p = (n) & lt; - [: RELTYPE *] - (M) LENGTH (P) DESC LIMIT 1 by return length (P) order

Keep in mind that depending on the structure and size of your graph, Query can be expensive.

Use 1.9 for Neo4j: 

  START n = node (*) MATCH P = (N) & lt; - [: RELTYPE *] - (M) Return length (P) Order by lens (P) DESC LIMIT 1

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