Safey of deleting very large partitions to reclaim disk space

[Guy]

Originally from the User Slack](https://scylladb-users.slack.com/)

@MK: is it safe to do huge partition deletes (like a couple million) in scylla as they are obselete. this is to reclaim space. the entire partition will be deleted. And we dont do any range scans on the table, all the reads are only single partition based.

@avi: It is safe