Adds the next row, as an array of DataValues, to the accumulator. This method is called once for each row in the dataset.

Initializes the accumulator. This method is called before the calculation starts. This method can be called multiple times on the same instance and the accumulator should reset internal state after each call.

Stops the calculations and calculates the result value.

Gets the result value after the calculation is finished. This property is only retrieved after the Terminate  call.