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v5.0
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    v5.0

      Schema Overview

      HDC

      Overview

      The Schema Overview algorithm summarizes the structure of a graph by presenting the statistics of the source node schema (label), edge schema, end node schema, and the count of edges.

      Example Graph

      To create this graph:

      // Runs each row separately in order in an empty graphset
      create().node_schema("account").node_schema("movie").node_schema("country").node_schema("director").edge_schema("follow").edge_schema("like").edge_schema("filmedIn").edge_schema("direct")
      insert().into(@account).nodes([{_id:"David"}, {_id:"Emily"}, {_id:"Alice"}])
      insert().into(@movie).nodes([{_id:"Titanic"}, {_id:"Avatar"}])
      insert().into(@country).nodes({_id:"Mexico"})
      insert().into(@director).nodes({_id:"James Cameron"})
      insert().into(@follow).edges([{_from:"David", _to:"Alice"}, {_from:"Emily", _to:"Alice"}])
      insert().into(@like).edges({_from:"Alice", _to:"Titanic"})
      insert().into(@filmedIn).edges({_from:"Titanic", _to: "Mexico"})
      insert().into(@direct).edges([{_from:"James Cameron", _to:"Titanic"}, {_from:"James Cameron", _to:"Avatar"}])
      

      Creating HDC Graph

      To load the entire graph to the HDC server hdc-server-1 as hdc_schema_ov:

      CALL hdc.graph.create("hdc-server-1", "hdc_schema_ov", {
        nodes: {"*": ["*"]},
        edges: {"*": ["*"]},
        direction: "undirected",
        load_id: true,
        update: "static",
        query: "query",
        default: false
      })
      

      hdc.graph.create("hdc_schema_ov", {
        nodes: {"*": ["*"]},
        edges: {"*": ["*"]},
        direction: "undirected",
        load_id: true,
        update: "static",
        query: "query",
        default: false
      }).to("hdc-server-1")
      

      Parameters

      Algorithm name: schema_overview

      Name
      Type
      Spec
      Default
      Optional
      Description
      order String asc, desc / Yes Sorts the results by count.

      Full Return

      CALL algo.schema_overview("hdc_schema_ov", {
        params: {},
        return_params: {}
      }) YIELD result
      RETURN result
      

      exec{
        algo(schema_overview).params() as result
        return result
      } on hdc_schema_ov
      

      Result:

      node schema(src)
      edge schema
      node schema(dest)
      count
      account follow account 2
      account like movie 1
      movie filmedIn country 1
      director direct movie 2

      Stream Return

      CALL algo.schema_overview("hdc_schema_ov", {
        params: {},
        return_params: {
          stream: {}
        }
      }) YIELD r
      FILTER r.`node schema(src)` = "account" 
      RETURN r
      

      exec{
        algo(schema_overview).params().stream() as r
        where r.`node schema(src)` == "account" 
        return r
      } on hdc_schema_ov
      

      Result:

      node schema(src)
      edge schema
      node schema(dest)
      count
      account follow account 2
      account like movie 1
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