{
  head: {
    version: 1,
    generator: {
      type: "org.apache.drill.exec.planner.logical.DrillImplementor",
      info: ""
    },
    type: "APACHE_DRILL_PHYSICAL",
    resultMode: "EXEC"
  },
  graph: [{
    @id: 1,
    pop:"mock-scan",
    url: "http://apache.org",
    entries: [{
      records: 1,
      types: [
        {name: "tinyint_val", type: "TINYINT", mode: "REQUIRED"},
        {name: "smallint_val", type: "SMALLINT", mode: "REQUIRED"},
        {name: "int_val", type: "INT", mode: "REQUIRED"},
        {name: "bigint_val", type: "BIGINT", mode: "REQUIRED"},
        {name: "uint8_val", type: "UINT8", mode: "REQUIRED"}
      ]
    }]
  },
  {
    pop: "project", @id: 2, child: 1,
    exprs: [{ref: "testColumn", expr: "__CONVERT_EXPRESSION__"}]
  },
  {
    pop: "selection-vector-remover", @id:3, child: 2
  },
  {
    pop: "screen", @id: 4, child: 3
  }]
}