presto-cassandra/src/main/java/io/prestosql/plugin/cassandra/CassandraRecordCursor.java/CassandraRecordCursor/CassandraRecordCursor
class CassandraRecordCursor:    public CassandraRecordCursor(CassandraSession cassandraSession, List<CassandraType> cassandraTypes, String cql)
    {
        this.cassandraTypes = cassandraTypes;
        rs = cassandraSession.execute(cql);
        currentRow = null;
    }