What is the syntax for using the `schema_of_csv` function in Databricks SQL?
The syntax for using the `schema_of_csv` function in Databricks SQL is:
```sql
schema_of_csv(csv [, options] )
```
Where `csv` is a STRING literal with valid CSV data, and `options` is an optional MAP literal where keys and values are STRING. The function returns a STRING composing a struct. The field names are derived by position as `_Cn`. The values hold the derived formatted SQL types. For details on options, see the `from_csv` function.