You are right. There are some odd things about this connector. Earlier I got
OOM exception with this connector just because there was a bug in the
connector which transferred only 64 bytes before closing the connection and
now this one
Strangely I copied the data into another data frame and it worked on the new
dataframe 
val dfCol1 = dfCol.limit(dfCol.count.toInt) and now groupby worked 

Can you tel me whats the difference between using cassandrasqlcontext and
the sqlcontext with loading the cassandra driver. I think internally
cassandra is also loading the same driver right?



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