{
    head:{
        type:"APACHE_DRILL_PHYSICAL",
        version:"1",
        generator:{
            type:"manual"
        }
    },
    graph:[
        {
            @id:1,
            pop:"mock-sub-scan",
            url: "http://apache.org",
            entries:[
              {records: 100, types: [
                {name: "blue", type: "INT", mode: "REPEATED"},
                {name: "red", type: "BIGINT", mode: "REPEATED"},
                {name: "green", type: "INT", mode: "REQUIRED"}
              ]}
            ]
        },
        {
            @id:2,
            pop: "union-exchange",
            child: 1
        },
        {
            @id:3,
            child: 2,
            pop:"filter",
            expr: "b > 5",
            selectivity: 0.8
        },
        {
            @id: 4,
            child: 3,
            pop: "mock-store"
        },
        {
            @id:5,
            child: 4,
            pop: "union-exchange"
        },
        {
            @id: 6,
            child: 5,
            pop: "screen"
        }
    ]
}