RMLTC0009a-JSON and RMLTC0009b-JSON: missing null value in data

[ghsnd]

These test cases assumes a null value for "Sport" in student.json in the second record. However, the Sport key is just omitted:

    { 
      "ID": 20,
      "Name": "Demi Moore"
    }

For Sport to be null, the record should look like:

    { 
      "ID": 20,
      "Sport": null
      "Name": "Demi Moore"
    }

[pmaria]

This depends on the reference formulation. For JSONPath for example, the question is: how do we handle JSONPaths Nothing type. This should be defined in the IO-registry. My initial feeling is that it can be handled as null for RML.

Any thoughts @ghsnd @DylanVanAssche ?

[DylanVanAssche]

Agreed, Nothing == null for us and rml-io-registry material! Non-existing key is the same as NULL for Processors.

[dachafra]

Shall we move this to rml-io-registry then?