It will be very useful to have an OneAgent extension to profile out of the box Cassandra DB calls.
Today it is impossible. Our support advises us to work around with a custom service into a code profiling, but it will be better to have the same level of profiling than SQL Server DB.
Are you not seeing PurePaths at all for Cassandra without creating a custom service? My understanding is we should show them out of the box already. We offer insights into the db behavior via a plugin, also. So the coverage should be similar to what we offer for SQL. If you want to send me your details (tenant or managed cluster or account name -- where you work) I can login and poke around some. My address is dave dot mauney at dynatrace dot com.