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v4.5
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    v4.5

      Schema Checker

      • Expression: @<schema>
      • Operand: string constant

      When combined with property filtering, i.e., when @<schema> && <property> == 123 is shortened as @<schema>.<property> == 123, the <property> cannot be _id or _uuid

      The @<schema> and @<schema>.<property> that appear in an Ultipa filter find the metadata of a specific schema and/or property, which is different than the @<schema> and @<schema>.<property> that appear in some other chain statements that find a specific schema and/or property in a graph model. Please read GraphSet | Schema | Property for more information.

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

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

      create().node_schema("professor").node_schema("student")
      create().node_property(@*, "age", int32).node_property(@*, "email", string)
      insert().into(@professor).nodes([{_id:"P001",_uuid:1,age:53,email:"[email protected]"},{_id:"P002",_uuid:2,age:27,email:"[email protected]"}])
      insert().into(@student).nodes([{_id:"S001",_uuid:3,age:27,email:"[email protected]"},{_id:"S002",_uuid:4,age:20,email:"[email protected]"},{_id:"S003",_uuid:5,age:25,email:"[email protected]"}])
      

      Schema

      Example: Find nodes of @student

      find().nodes({@student}) as n
      return n{*} 
      

      |---------------- @student ---------------|
      |  _id  | _uuid |  age  |       email     |
      |-------|-------|-------|-----------------|
      | S001  |   3   |  27   | [email protected]   |
      | S002  |   4   |  20   | [email protected]     |
      | S003  |   5   |  25   | [email protected]  |
      

      Analysis: This filter is equivalent to {this.@ == "student"}

      Schema & Property

      Example: Find nodes of @student, whose age is 27

      find().nodes({@student.age == 27}) as n
      return n{*} 
      

      |---------------- @student ---------------|
      |  _id  | _uuid |  age  |       email     |
      |-------|-------|-------|-----------------|
      | S001  |   3   |  27   | [email protected]   |
      

      Analysis: This filter is equivalent to {@student && age == 27}.

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