-- | The Count aggregate operation
raggCount :: 
        ColumnName -- ^ source column
    ->  ColumnName -- ^ target column
    ->  RAggOperation
raggCount src trg = RAggOperation {
                 sourceCol = src
                ,targetCol = trg
                ,aggFunc = \rtab -> createRtuple [(trg, countFold src trg rtab)]  
        }
raggCount :: 
        ColumnName -- ^ source column
    ->  ColumnName -- ^ target column
    ->  RAggOperation
raggCount src trg = RAggOperation {
                 sourceCol = src
                ,targetCol = trg
                ,aggFunc = \rtab -> createRtuple [(trg, countFold src trg rtab)]  
        }
raggCount src trg = RAggOperation {
                 sourceCol = src
                ,targetCol = trg
                ,aggFunc = \rtab -> createRtuple [(trg, countFold src trg rtab)]  
        }