neo4j find all nodes with matching properties

Question

I have a relatively large set of nodes, and I want to find all pairs of nodes that have matching property values, but I don\'t know or care in advance what the property valu

Answer 1

What about the following approach:

• use getAllNodes to get an Iterable over all nodes.
• using getPropertyKeys and getProperty(key) build up a java.util.Map containing all properties for a node. Calculate the map's hashCode()
• build up a global Map using the hashCode as key and a set of node.getId() as values

This should give you the candidates for being duplicate. Be aware of the hashCode() semantics, there might be nodes with different properties mapping to the same hashCode.