Schema Overview

Overview

The Schema Overview algorithm summarizes the structure of a graph by presenting statistics for source node schemas (labels), edge schemas, end node schemas, and the corresponding edge counts.

Example Graph

Run the following statements on an empty graph to define its structure and insert data:

GQLUQL
ALTER GRAPH CURRENT_GRAPH ADD NODE {
  account (), 
  movie (),
  country (),
  director ()
};
ALTER GRAPH CURRENT_GRAPH ADD EDGE {
  follow ()-[]->(),
  like ()-[]->(),
  filmedIn ()-[]->(),
  direct ()-[]->()
};
INSERT (David:account {_id: "David"}),
       (Emily:account {_id: "Emily"}),
       (Alice:account {_id: "Alice"}),
       (Titanic:movie {_id: "Titanic"}),
       (Avatar:movie {_id: "Avatar"}),
       (Mexico:country {_id: "Mexico"}),
       (JC:director {_id: "James Cameron"}),
       (David)-[:follow]->(Alice),
       (Emily)-[:follow]->(Alice),
       (Alice)-[:like]->(Titanic),
       (Titanic)-[:filmedIn]->(Mexico),
       (JC)-[:direct]->(Titanic),
       (JC)-[:direct]->(Avatar);

Creating HDC Graph

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

GQLUQL
CREATE HDC GRAPH my_hdc_graph ON "hdc-server-1" OPTIONS {
  nodes: {"*": ["*"]},
  edges: {"*": ["*"]},
  direction: "undirected",
  load_id: true,
  update: "static"
}

Parameters

Algorithm name: schema_overview

Full Return

GQLUQL
CALL algo.schema_overview.run("my_hdc_graph", {}) YIELD r
RETURN r

Result:

Stream Return

GQLUQL
CALL algo.schema_overview.stream("my_hdc_graph", {}) YIELD r
FILTER r.`node schema(src)` = "account" 
RETURN r

Result: