概述

Schema总览算法通过统计起、终点schema信息、其间的边schema信息及相应边数，实现对图结构的整体展示。

示例图集

创建示例图集：

// 在空图集中逐行运行以下语句
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"}])

创建HDC图集

将当前图集全部加载到HDC服务器hdc-server-1上，并命名为 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")

参数

算法名：schema_overview

完整返回

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

结果：

流式返回

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

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

结果：