count + aggragation

[Alieh]

Hello all,

1st question:
Is there any way to know the count or the content of a "Fink DataSet" 
without using count() or collect()? The problem is that I have a loop 
which the number of iterations depends on the count of a DataSet. Using 
count() may force the whole pipeline to be executed again. I do not like 
to use delta or bulk iteration.

2nd question:

Using the "Aggregations.Max" on a DataSet of Tuple2<String, Integer> on 
the second field, I observed that the second field is the real maximum 
of the whole dataset while the first field is not the corresponding one 
to the second!!!

Best,
Alieh