{
    "filter": {
        "fields": [
            {
                "dimensions": [
                    "A",
                    "B"
                ],
                "type": "columnComparison"
            },
            {
                "fields": [
                    {
                        "dimensions": [
                            "C",
                            "D"
                        ],
                        "type": "columnComparison"
                    },
                    {
                        "fields": [
                            {
                                "field": {
                                    "dimension": "F",
                                    "type": "selector",
                                    "value": null
                                },
                                "type": "not"
                            },
                            {
                                "dimension": "F",
                                "lower": 2,
                                "ordering": "numeric",
                                "type": "bound"
                            }
                        ],
                        "type": "and"
                    }
                ],
                "type": "and"
            }
        ],
        "type": "or"
    }
}