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    Expression | Filter


    Expression is a syntactical arithmetic combination of Operator and Operand. Every expression has a value.

    • Operator: conditional operators, logical operators, numeric operators (see the next chapter for operators and their precedence)

    • Operand: constant, alias, function, current schema, current property

    Operand Examples Example Expressions
    Constant 1,"abc", "2020-01-01 0:0:0" {1+3*2}
    Alias nodes,edges,paths {nodes.level},{edges.amount < 2000}
    Function now(),count(nodes),year("2022-04-12") {year(edges.time) > 2020}
    Current schema this.@ {@ == "card"},{@product}
    Current property this._id, {level != 2}

    (Nodes, edges, paths listed above are the aliases of Edge, Node, and Path; "this" from the aliases of current node and edge can be omitted in most cases)

    • Value: NODE,EDGE,PATH,ATTR(number, time, string, True/False),ARRAY,TABLE


    Ultipa filter is an expression encapsulated in curly bracket { }, which acquires the property and schema of node/edge by calling the alias. The expression produces true if the current node/edge meets the filtering rules. The filtering of node/edge is supported by all Ultipa query operations.

    Conversion between number and True/False in a filter:

    • From number to True/False, non 0 is true, 0 is false
    • From True/False to number, true is 1, false is 0

    When converting string, datetime to True/False: it will be converted to False if first character is 0, otherwise True. When converting timestamp to Ture/False, for instance, '1970-01-01 08:00:00' should be False, otherwise True.

    Example: find 10 cards whose balances are NOT 0

    find().nodes({@card.balance}) as n
    limit 10
    return n{*}

    The implementation scenarios of Ultipa filter:

    Implementation Specification Example
    Common filtering To filter current node or edge in any types of queries {time > "2022-02-24 07:00:00"}
    Inter-step filtering To filter current node or edge using precedent nodes or edges in the same path {time > prev_e.time}
    Full-text filtering To filter current node or edge against the word segmentation result of any of their properties ( refer to Conditional Operator - Contains and Index | Full-text | LTE - Full-text Filter) {~content contains "graph ultra* database"}

    (The "time" is a property name, "content" is the full-text index for a property)

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