{
  "head" : {
    "type" : "APACHE_DRILL_LOGICAL",
    "version" : 1,
    "generator" : {
      "type" : "optiq",
      "info" : "na"
    }
  },
  "storage" : {
    "parquet-local" : {
      "type" : "parquet",
      "dfsName" : "file:///",
      "enabled" : true
    }
  },
  "query" : [ {
    "op" : "scan",
    "@id" : 1,
    "memo" : "initial_scan",
    "storageengine" : "parquet-local",
    "selection" : [ {
      "path" : "/tmp/region.parquet"
    } ],
    "ref" : "_MAP"
  }, {
    "op" : "filter",
    "@id" : 2,
    "input" : 1,
    "expr" : " (_MAP.R_NAME)  == ('AFRICA') "
  }, {
    "op" : "project",
    "@id" : 3,
    "input" : 2,
    "projections" : [ {
      "ref" : "EXPR$0",
      "expr" : "_MAP.R_REGIONKEY"
    }, {
      "ref" : "NAME",
      "expr" : "_MAP.R_NAME"
    } ]
  }, {
    "op" : "store",
    "@id" : 4,
    "memo" : "output sink",
    "input" : 3,
    "target" : {
      "number" : 0
    },
    "partition" : null,
    "storageEngine" : "queue"
  } ]
}