columns {
  name: "key"
  type {
    type_id: UTF8
  }
}
columns {
  name: "key1"
  type {
    type_id: UTF8
  }
}
columns {
  name: "subkey"
  type {
    type_id: UTF8
  }
}
columns {
  name: "subkey1"
  type {
    type_id: UTF8
  }
}
columns {
  name: "value"
  type {
    type_id: UTF8
  }
}
rows {
  items {
    text_value: "3"
  }
  items {
    text_value: "3"
  }
  items {
    text_value: "c"
  }
  items {
    text_value: "c"
  }
  items {
    text_value: "value1_3"
  }
}
rows {
  items {
    text_value: "INVALID"
  }
  items {
    text_value: "INVALID"
  }
  items {
    text_value: "b"
  }
  items {
    text_value: "b"
  }
  items {
    text_value: "value1_2"
  }
}
