presto-cassandra/src/main/java/io/prestosql/plugin/cassandra/CassandraHandleResolver.java/CassandraHandleResolver/getTransactionHandleClass
class CassandraHandleResolver:    @Override
    public Class<? extends ConnectorTransactionHandle> getTransactionHandleClass()
    {
        return CassandraTransactionHandle.class;
    }