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Apache TinkerPop•10mo ago

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) 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/t...

GitHub

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

Apache TinkerPop - a graph computing framework. Contribute to apache/tinkerpop development by creating an account on GitHub.

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Solution

spmallette•10mo ago

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) 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...

Apache TinkerPop - a graph computing framework. Contribute to apache/tinkerpop development by creating an account on GitHub.

Valentyn Kahamlyk•10mo ago

for TinkerGraph it's just default Cardinality https://github.com/apache/tinkerpop/blob/3.6-dev/tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gremlin/tinkergraph/structure/TinkerGraph.java#L420-L422

GitHub

tinkerpop/tinkergraph-gremlin/src/main/java/org/apache/tinkerpop/gr...

Apache TinkerPop - a graph computing framework. Contribute to apache/tinkerpop development by creating an account on GitHub.

spmallette•10mo ago

yeah, that's what i mean. it's a hint...at best

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