{--
data RAggOperation = 
          RSum ColumnName  -- ^  sums values in the specific column
        | RCount ColumnName -- ^ count of values in the specific column
        | RCountDist ColumnName -- ^ distinct count of values in the specific column
        | RAvg ColumnName  -- ^ average of values in the specific column
        | RMin ColumnName -- ^ minimum of values in the specific column
        | RMax ColumnName -- ^ maximum of values in the specific column
--}

-- | ropU operator executes a unary ROperation
ropU = runUnaryROperation
ropU = runUnaryROperation
ropU = runUnaryROperation