columns {
  name: "column0"
  type {
    type_id: UINT64
  }
}
columns {
  name: "column1"
  type {
    type_id: UINT64
  }
}
columns {
  name: "column2"
  type {
    type_id: UINT64
  }
}
rows {
  items {
    uint64_value: 13
  }
  items {
    uint64_value: 11
  }
  items {
    uint64_value: 5
  }
}
rows {
  items {
    uint64_value: 24
  }
  items {
    uint64_value: 21
  }
  items {
    uint64_value: 6
  }
}
