presto-cassandra/src/main/java/io/prestosql/plugin/cassandra/CassandraPartitionManager.java/CassandraPartitionManager/CassandraPartitionManager
class CassandraPartitionManager:    @Inject
    public CassandraPartitionManager(CassandraSession cassandraSession)
    {
        this.cassandraSession = requireNonNull(cassandraSession, "cassandraSession is null");
    }