I'm really excited about this release, particularly because of the new labels and uniqueness constraints functionality. I'm using Neo4J as the back end for my own startup, and I switched to 2.0 a little while ago for development. It required some rethinking to eliminate hacks that I had to get around the lack of label-like functionality. Big win!
I am assuming the labels are used as a heuristic for traversing the graph. What kind of speed increases in graph traversal are available w/ labels vs w/o labels?
They are used to attache indexes and constraints on them in order to speed up traversals. They themselves have very little logic right now, more will follow in terms of query optimisation etc..
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