private Tuple joinTuples(Tuple firstTuple, Tuple secondTuple) {
Tuple joinedTuple = firstTuple.clone();
joinedTuple.setOid(new TupleOID(IntegerOIDGenerator.getNextOID()));
joinedTuple.getCells().addAll(secondTuple.clone().getCells());
if (logger.isDebugEnabled()) logger.trace("Joined tuple: \n" + joinedTuple);
return joinedTuple;
}
