フリー問題

問題文

The reader can either be told the field list explicitly or work it out from the data it sees. The analysers occasionally send a numeric field as an empty string. Which choice fits, and what is the risk of the other?

選択肢

1. The reader is given the complete definition, and letting it work the types out from the agreed rows would change the shape of the output whenever the data changes in this configuration.
2. The reader is given the implied definition, and letting it work the types out from the observed rows would change the shape of the output whenever the data changes in this configuration.
3. The reader is given the implied definition, and letting it work the types out from the agreed rows would change the shape of the output whenever the data changes in this configuration.
4. The reader is given the complete definition, and letting it work the types out from the observed rows would change the shape of the output whenever the data changes in this configuration.