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v4.0
    v4.0

    collect() | Collection

    Parameters, value

    Collection operation can aggregate a column of nodes, edges, paths, property values or schemas into an array in the original order, as long as it is a column of elements, it can be converted into an array by collect().

    Syntax:

    • format: collect(<column>)
    • parameters: (see list below)
    • value: ARRAY
    Name Category Specification Description
    <column> NODE,EDGE,PATH,ATTR,ARRAY,TABLE / The column to be aggregated

    <column>'s value for each category of <column>:

    Category value
    NODE NODE's UUID in the column
    EDGE EDGE's UUID in the column
    PATH ROW INDEX(starting from 0)in the column
    ATTR ATTR's value in the column
    ARRAY ARRAY'S value in the column
    TABLE Value of the array transformed from the table in the column

    ATTR

    Example: find 10 nodes and collect their schema

    find().nodes([1,2,3,4,5,6,7,8,9,10]) as n
    return collect(n.@)
    

    NODE

    Example: find 10 @product nodes, collect their UUID

    find().nodes({@product}) as n
    limit 10
    return collect(n)
    

    EDGE

    Example: find 10 @transfer edges, collect their UUID

    find().edges({@transfer}) as e
    limit 10
    return collect(e)
    

    PATH

    Example: find 10 shortest paths from Card CA001 within 2 steps, list the paths by the destination card's balances by descending order, and collect the column number of the paths.

    n({_id == "CA001"}).e({@transfer})[2].n(as n).limit(10) as p
    order by n.balance desc
    return collect(p)
    

    Analysis: the column number of the paths in the stream starts from 0,

    ARRAY

    Example: find paths from Card CA001 within 3 steps, count the number of the nodes of each path, then collect these nodes

    n({_id == "CA001"}).e()[3].n() as p
    with pnodes(p) as a
    return collect(a)
    
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