columns {
  name: "email"
  type {
    optional_type {
      item {
        type_id: STRING
      }
    }
  }
}
columns {
  name: "yandexuid"
  type {
    optional_type {
      item {
        type_id: UINT64
      }
    }
  }
}
rows {
  items {
    bytes_value: "test@email.com"
  }
  items {
    uint64_value: 999999999999999999
  }
}
rows {
  items {
    bytes_value: "test00000@email.com"
  }
  items {
    uint64_value: 999999999999999999
  }
}
rows {
  items {
    bytes_value: "test00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000@email.com"
  }
  items {
    uint64_value: 999999999999999999
  }
}
rows {
  items {
    bytes_value: "test0000000000000@email.com"
  }
  items {
    uint64_value: 999999999999999999
  }
}
rows {
  items {
    bytes_value: "test0@email.com"
  }
  items {
    uint64_value: 999999999999999999
  }
}
