How can I extract the host name from a URL string using the `parse_url` function in Databricks SQL?
You can use the `parse_url` function in Databricks SQL to extract the host name from a URL string by specifying 'HOST' as the `partToExtract` argument. Here's an example:

```sql
SELECT parse_url('http://spark.apache.org/path?query=1', 'HOST');
```

In this example, the `parse_url` function extracts the host name from the URL string `'http://spark.apache.org/path?query=1'`, which is `'spark.apache.org'`.