framework/resources/Datasources/json_kvgenflatten/kvgen2.json

{
    "rownum": 1,
    "varcharcol": {
        "varchar_1": "abc",
        "varchar_2": "def",
        "key": "value"
    }
}
{
    "rownum": 2,
    "varcharcol": {
        "varchar_1": null,
        "varchar_2": ""
    }
}
{
    "rownum": 3,
    "varcharcol": {
        "varchar_1": null,
        "varchar_2": "",
        "varchar_2": null,
        "varchar_2": "hello",
        "varchar_2": "how"
    }
}
{
    "rownum": 2,
    "varcharcol": {
    }
}