Neo4J Cypher - 从路径变量展开节点

Question

I have seen examples of unwinding lists, but not of unwinding a list of paths. How can I find, for example, all of the shortest paths between one type of node and another, and return or get the nodes that are found, in this example the nodes specifically being b .

MATCH p = allShortestPaths((a: person)-[:PARENT_OF]-(b: person))
UNWIND nodes(p) ... //get all of the b nodes
RETURN b

Note: I would like to use b within the query for another purpose (omitted), and therefore need to unwind the path into a list of b nodes.

Answer 1

After matching all shortest paths, if you just want the b nodes as a result, you may simply RETURN b . I don't believe you need to UNWIND it, since b is clearly identified in your MATCH

Edit:

MATCH p = allShortestPaths((a: person)-[:PARENT_OF]-(b: person))
WITH collect(b) as bees
UNWIND bees as b
//do something
return b

Answer 2

It seems like you just want to see all person nodes that have an incoming PARENT_OF node from another person node. If so, this should work:

MATCH ()-[:PARENT_OF]->(b:person)
RETURN DISTINCT b;

Answer 3

MATCH p = allShortestPaths((a: person)-[:PARENT_OF]-(b: person))
with nodes(p) as nodes
with nodes[size(nodes)-1] as b
return b