フリー問題

問題文

A developer writes VECTOR_DISTANCE with two arguments and no third argument on a column that carries no vector index. The team asks which distance the database will use for that call. Which statement describes the behavior?

選択肢

1. The call uses the euclidean metric because that metric is the cheapest choice when the column has no index.
2. The call raises an error because a metric must be named whenever the column carries no vector index.
3. The call uses the hamming metric because that metric works for every dimension format that a column can hold.
4. The call uses the cosine metric because that metric is the default when no metric is named and no index exists.