If you installed a recent enough version of Redash, then it means you already have the dependencies installed and then you just need to add Cassandra to the list of enabled data sources. You can do so by settings
If you used the AMI we provide or the bootstrap script, you just need to add to
/opt/redash/.env the line
export REDASH_ADDITIONAL_QUERY_RUNNERS=redash.query_runner.cass. Then you need to restart (
supervisorctl restart all).
If Cassandra still doesn't show, make sure you installed
cassandra-driver PyPi package (version 3.1.1).