Hi everyone, 

Sorry I don't have sample code for this question. Does anyone know how to use rolling window without assigning a window size? My use case was simple, I just want to iterate all the historical data once. 

However, with the current usage of rolling window which require a defined window size. It brings some unnecessary operation. For example, if the window size is 5 days, and the duration for the onData is 15 days. then it will be looped 11 times, 

But all i want to do is just loop one time only for all the available data. Of course, it can be fixed by setting the windowSize as 15. What if some data only got 13 days and some only has 11 days? Then the rolling window will be crashed.

Any ideas? Thank you.