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      CALL

      CALL executes operations against the query result of each subquery, NOT all the result of a query command. It wraps query commands and the operations in curly braces {}, passes in the alias that triggers each subquery using a WITH clause and passes out the result of each subquery using a RETURN clause.

      Syntax:
      CALL {
        WITH <alias_In>, <alias_In>, ...
        ...
        RETURN <expression> as <alias_Out>, <expression> as <alias_Out>, ...
      } Input:

      • <alias_In>: The alias that triggers the subquery
      • <expression>: The return value of the subquery
      • <alias_Out>: The alias of return value of the subquery, optional when <expression> is alias

      For instance, skip the first row of each subquery result p:

      find().nodes([1, 5]) as nodes
      call {
        with nodes
        n(nodes).e()[:2].n() as p
        skip 1
        return p as path
      }
      return path
      

      Sample graph: (to be used for the following examples)

      Run below UQLs one by one to in an empty graphset to create graph data:

      create().node_schema("country").node_schema("movie").node_schema("director").edge_schema("filmedIn").edge_schema("direct")
      create().node_property(@*, "name")
      insert().into(@country).nodes([{_id:"C001", _uuid:1, name:"France"}, {_id:"C002", _uuid:2, name:"USA"}])
      insert().into(@movie).nodes([{_id:"M001", _uuid:3, name:"Léon"}, {_id:"M002", _uuid:4, name:"The Terminator"}, {_id:"M003", _uuid:5, name:"Avatar"}])
      insert().into(@director).nodes([{_id:"D001", _uuid:6, name:"Luc Besson"}, {_id:"D002", _uuid:7, name:"James Cameron"}])
      insert().into(@filmedIn).edges([{_uuid:1, _from_uuid:3, _to_uuid:1}, {_uuid:2, _from_uuid:4, _to_uuid:1}, {_uuid:3, _from_uuid:3, _to_uuid:2}, {_uuid:4, _from_uuid:4, _to_uuid:2}, {_uuid:5, _from_uuid:5, _to_uuid:2}])
      insert().into(@direct).edges([{_uuid:6, _from_uuid:6, _to_uuid:3}, {_uuid:7, _from_uuid:7, _to_uuid:4}, {_uuid:8, _from_uuid:7, _to_uuid:5}])
      

      Comman Usage

      Example: Not using GROUP BY, find how many movies are filmed in each country

      find().nodes({@country}) as nodes
      call { 
        with nodes
        n(nodes).e().n({@movie} as n)
        return count(n) as number
      }
      return table(nodes.name, number)
      

      | nodes.name | number |
      |------------|--------|
      | France     | 2      |
      | USA        | 3      |
      
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