How to get cardinality of property? - Apache TinkerPop

Apache TinkerPop•3y ago•

5 replies

Valentyn Kahamlyk

How to get cardinality of property?

I have a multi property and I want to find out its cardinality. How can I do that?
valueMap/elementMap don't help

Solution

TinkerPop really doesn't know, so it can't tell you the answer. It has no notion of schema. You as the user have to know and adjusting your Gremlin accordingly in your application layer. The best that we have internally (and maybe for embedded use cases) is

VertexFeatures.getCardinality(String)

VertexFeatures.getCardinality(String)

which, if implemented by the provider, will tell you a hint at the cardinality. https://github.com/apache/tinkerpop/blob/1e3c881d9f157167b53f431898e6d1ee40429cd0/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/structure/Graph.java#L581-L594

GitHub

tinkerpop/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/s...

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tinkerpop/gremlin-core/src/main/java/org/apache/tinkerpop/gremlin/s...

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