{
    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:"filter",
            expr: "b > 5",
            selectivity: 0.80
        },
        {
            @id: 3,
            child: 2,
            pop: "mock-store"
        },
        {
            @id: 4,
            child: 3,
            pop: "screen"
        }
    ]
}