One option would be to create a unique value node for each distinct color and create a relationship from car to that value node. The value nodes can be grouped together with relationships to some reference node.
This gives the opportunity of finding all distinct colors, and it allows you to find all cars with that particular color. > Date: Sun, 1 May 2011 14:41:40 +0200 > From: matt...@neotechnology.com > To: user@lists.neo4j.org > Subject: Re: [Neo4j] Lucene/Neo Indexing Question > > 2011/4/26 Rick Bullotta <rick.bullo...@thingworx.com>: > > Hi, Mattias. > > > > Here's a use case: > > > > I have a million nodes representing cars, and those nodes are all "tagged" > > with some value, let's say a color name, as a property. I have indexed > > those nodes on the color property value. Now I'd like to present a list of > > the distinct color values with which nodes (cars) have been tagged. At > > present, I'd need to iterate through all million, read the property, and > > maintain a "distinct" HashSet as I iterate through them. > > > > I've tried using relationships from the "car" node(s) to a set of "color" > > node(s), but had scalability/performance issues when there are lots of car > > nodes being added/deleted (the "color" node quickly becomes a hot > > spot/synchronization choke point). > > Allright, yeah such nodes can become bottlenecks, so I see your > problem for sure. > > > > Rick > > > > > > -----Original Message----- > > From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On > > Behalf Of Mattias Persson > > Sent: Tuesday, April 26, 2011 2:17 PM > > To: Neo4j user discussions > > Subject: Re: [Neo4j] Lucene/Neo Indexing Question > > > > Hi Rick, > > > > No, not really. What the use case for having such a method? > > > > 2011/4/26 Rick Bullotta <rick.bullo...@thingworx.com>: > >> Hi, all. > >> > >> Is there a method or suggested approach for obtaining a list of all of the > >> distinct key values in a given index? I don't care about the indexed > >> nodes or relationships themselves, just the value(s) of the key. > >> > >> Thanks, > >> > >> Rick > >> > >> _______________________________________________ > >> Neo4j mailing list > >> User@lists.neo4j.org > >> https://lists.neo4j.org/mailman/listinfo/user > >> > > > > > > > > -- > > Mattias Persson, [matt...@neotechnology.com] > > Hacker, Neo Technology > > www.neotechnology.com > > _______________________________________________ > > Neo4j mailing list > > User@lists.neo4j.org > > https://lists.neo4j.org/mailman/listinfo/user > > _______________________________________________ > > Neo4j mailing list > > User@lists.neo4j.org > > https://lists.neo4j.org/mailman/listinfo/user > > > > > > -- > Mattias Persson, [matt...@neotechnology.com] > Hacker, Neo Technology > www.neotechnology.com > _______________________________________________ > Neo4j mailing list > User@lists.neo4j.org > https://lists.neo4j.org/mailman/listinfo/user _______________________________________________ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
