{
  "head" : {
    "version" : 1,
    "generator" : {
      "type" : "optiq",
      "info" : "na"
    },
    "type" : "APACHE_DRILL_PHYSICAL"
  },
  "graph" : [ {
    "pop" : "parquet-scan",
    "@id" : 1,
    "entries" : [ {
      "path" : "tpch/orders.parquet"
    } ],
    "storage" : {
      "type" : "file",
      "connection" : "classpath:///",
      "workspaces" : null,
      "formats" : null,
      "enabled" : true
    },
    "format" : {
      "type" : "parquet"
    }
  }, {
    "pop" : "project",
    "@id" : 2,
    "exprs" : [ {
      "ref" : "$f0",
      "expr" : "O_CUSTKEY"
    }, {
      "ref" : "$f1",
      "expr" : "O_ORDERKEY"
    } ],
    "child" : 1
  }, {
    "pop" : "hash-aggregate",
    "@id" : 3,
    "child" : 2,
    "phase" : "PHASE_1of1",
    "keys" : [ {
      "ref" : "$f0",
      "expr" : "$f0"
    } ],
    "exprs" : [ {
      "ref" : "Y",
      "expr" : "sum($f1) "
    } ]
  }, {
    "pop" : "screen",
    "@id" : 4,
    "child" : 3
  } ]
}