{
  "head" : {
    "type" : "APACHE_DRILL_PHYSICAL",
    "version" : "1",
    "generator" : {
      "type" : "manual"
    }
  },
  "graph" : [ {
    "pop" : "parquet-scan",
    "@id" : 1,
    "entries" : [ {
      "path" : "/tmp/parquet/nation.parquet"
    } ],
    "storageengine" : {
      "type" : "parquet",
      "dfsName" : "file:///",
      "enabled": true
    },
    "ref" : "_MAP",
    "fragmentPointer" : 0
  }, {
    "pop" : "project",
    "@id" : 2,
    "exprs" : [ {
      "ref" : "regionkey",
      "expr" : "_MAP.N_REGIONKEY"
    }, {
      "ref" : "nationkey",
      "expr" : "_MAP.N_NATIONKEY"
    } ],
    "child" : 1
  }, {
    "@id" : 3,
    "child" : 2,
    "pop" : "screen"
  } ]
}