columns {
  name: "Id"
  type {
    type_id: INT64
  }
}
columns {
  name: "Profile"
  type {
    type_id: JSON_DOCUMENT
  }
}
rows {
  items {
    int64_value: 123
  }
  items {
    text_value: "{\"age\":30,\"name\":\"First name\"}"
  }
}
rows {
  items {
    int64_value: 456
  }
  items {
    text_value: "{\"age\":52,\"name\":\"Second name\"}"
  }
}
