{
  head : {
    type : "APACHE_DRILL_PHYSICAL",
    version : 1,
    generator : {
      type : "optiq",
      info : "na"
    }
  },
  graph : [ {
    pop : "parquet-scan",
    @id : 1,
    entries : [ {
      path : "/tmp/region.parquet"
    } ],
    ref : "_MAP",
    storageengine: {type: "parquet", dfsName: "file:///" },
    fragmentPointer : 0
  }, {
    pop : "project",
    @id : 2,
    exprs : [ {
      ref : "REGIONKEY",
      expr : "_MAP.R_REGIONKEY"
    }, {
      ref : "NAME",
      expr : "_MAP.R_NAME"
    } ],
    child : 1
  }, {
    pop : "project",
    @id : 3,
    exprs : [ {
      ref : "REGIONKEY0",
      expr : "REGIONKEY"
    }, {
      ref : "NAME0",
      expr : "NAME"
    } ],
    child : 2
  }, {
    pop : "sort",
    @id : 4,
    child : 3,
    orderings : [ {
      order : "ASC",
      expr : "NAME0"
    } ],
    reverse : false
  }, {
    pop : "selection-vector-remover",
    @id : 5,
    child : 4
  }, {
    pop : "parquet-scan",
    @id : 6,
    entries : [ {
      path : "/tmp/nation.parquet"
    } ],
    storageengine: {type: "parquet", dfsName: "file:///" },
    ref : "_MAP",
    fragmentPointer : 0
  }, {
    pop : "project",
    @id : 7,
    exprs : [ {
      ref : "NAME",
      expr : "_MAP.N_NAME"
    }, {
      ref : "REGIONKEY",
      expr : "_MAP.N_REGIONKEY"
    } ],
    child : 6
  }, {
    pop : "sort",
    @id : 8,
    child : 7,
    orderings : [ {
      order : "ASC",
      expr : "REGIONKEY"
    } ],
    reverse : false
  }, {
    pop : "selection-vector-remover",
    @id : 9,
    child : 8
  }, {
    pop : "merge-join",
    @id : 10,
    left: 9,
    right: 5,
    conditions : [ {
      relationship : "==",
      left : "REGIONKEY",
      right : "NAME0"
    } ]
  }, {
    pop : "selection-vector-remover",
    @id : 11,
    child : 10
  }, {
    pop : "project",
    @id : 12,
    exprs : [ {
      ref : "NAME",
      expr : "NAME"
    }, {
      ref : "NAME0",
      expr : "NAME0"
    } ],
    child : 11
  }, {
    pop : "screen",
    @id : 13,
    child : 12
  } ]
}