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