columns {
  name: "c_custkey"
  type {
    type_id: INT32
  }
}
columns {
  name: "c_name"
  type {
    type_id: STRING
  }
}
columns {
  name: "revenue"
  type {
    type_id: DOUBLE
  }
}
columns {
  name: "c_acctbal"
  type {
    type_id: DOUBLE
  }
}
columns {
  name: "n_name"
  type {
    type_id: STRING
  }
}
columns {
  name: "c_address"
  type {
    type_id: STRING
  }
}
columns {
  name: "c_phone"
  type {
    type_id: STRING
  }
}
columns {
  name: "c_comment"
  type {
    type_id: STRING
  }
}
