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v4.2
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    中文EN
    v4.2

      Spread

      Statement spread().src().depth() can find and return edges from a start node within K hops, by specifying depth (number of edges), applying filters on the nodes and edges. The found edges are returned in the k-index ascending order, as 1-step paths formed by the edges and their start/end nodes.

      Spread is a BFS (Breadth First Search) query method that is commonly used in graph query/analysis industry for observing layers of relationship around an entity, and to retrieve and acquire data quickly.

      Syntax:

      • Statement alias: supported (PATH)
      • All parameters:
      Parameter Type Specification Description Structure of Custom Alias
      src() Filter Mandatory The filtering rules of the start node; error will occur if multiple nodes are found NODE
      depth() Int >0; mandatory The maximum depth to spread Not supported
      node_filter() Filter The filtering rules that neighbor nodes other than src need to satisfy Not supported
      edge_filter() Filter The filtering rules that all edges need to satisfy Not supported
      direction() String left, right To specify the direction of the edge Not supported
      limit() Int -1 or >=0 Number of results to return for each subquery, -1 means to return all results Not supported

      1~N Steps

      Example: Spread from Card CA001 for 3 steps, return 10 one-step paths with their properties

      spread().src({_id == "CA001"}).depth(3) as p
      limit 10 
      return p{*}
      

      node_filter()

      Example: Spread from Card CA001 for 3 steps, filter all @card nodes, return 10 one-step paths with their properties

      spread().src({_id == "CA001"}).depth(3)
        .node_filter({!@card}) as p
      limit 10 
      return p{*}
      

      edge_filter()

      Example: Spread from Card CA001 for 3 steps, filter all @transfer edges, return 10 one-step paths with their properties

      spread().src({_id == "CA001"}).depth(3)
        .edge_filter({!@transfer}) as p
      limit 10 
      return p{*}
      

      direction(right)

      Example: Spread from Card CA001 for 3 steps, filter all edges in the right direction, return 10 one-step paths with their properties

      spread().src({_id == "CA001"}).depth(3)
        .direction(right) as p
      limit 10 
      return p{*}
      

      direction(left)

      Example: Spread from Card CA001 for 3 steps, filter all edges in the left direction, return 10 one-step paths with their properties

      spread().src({_id == "CA001"}).depth(3)
        .direction(left) as p
      limit 10 
      return p{*}
      

      limit()

      Example: Spread from Card CA001 and Card CA002 for 3 steps, return 20 one-step paths with their properties for each node

      uncollect ["CA001","CA002"] as n
      spread().src({_id == n}).depth(3)
        .limit(20) as p
      return p{*}
      
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