{
    "head": {
        "type": "APACHE_DRILL_PHYSICAL",
        "version": "1",
        "generator": {
            "type": "manual"
        }
    },
    "graph": [
        {
            "@id": 1,
            "pop": "mock-scan",
            "url": "http://apache.org",
            "entries": [
                {
                    "records": 100,
                    "types": [
                        {
                            "name": "blue",
                            "type": "INT",
                            "mode": "REQUIRED"
                        },
                        {
                            "name": "red",
                            "type": "BIGINT",
                            "mode": "REQUIRED"
                        },
                        {
                            "name": "green",
                            "type": "INT",
                            "mode": "REQUIRED"
                        }
                    ]
                }
            ]
        },
        {
            "@id": 2,
            "child": 1,
            "pop": "union-exchange"
        },
        {
            "@id": 3,
            "child": 2,
            "pop": "screen"
        }
    ]
}