No, you can connect to mysql from clickhouse
You can do it like this
tutor local run clickhouse bash
clickhouse-client -u YOURUSERNAME --password YOURPASSWORD
and after that you can fire the queries from clickhouse client to get the data.
You can take query references from tutor-cairn/tutorcairn/templates/cairn/apps/clickhouse/migrations.d/0002_grades.sql at master · overhangio/tutor-cairn · GitHub