columns {
  name: "c_name"
  type {
    type_id: STRING
  }
}
columns {
  name: "c_custkey"
  type {
    type_id: INT32
  }
}
columns {
  name: "o_orderkey"
  type {
    type_id: INT32
  }
}
columns {
  name: "o_orderdate"
  type {
    optional_type {
      item {
        type_id: DATE
      }
    }
  }
}
columns {
  name: "o_totalprice"
  type {
    type_id: DOUBLE
  }
}
columns {
  name: "sum_l_quantity"
  type {
    type_id: DOUBLE
  }
}
