Sliding Subwindows

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Sliding Subwindows

Hello, I would like to have a kind of sub windows. The idea is to have 3 windows in the following way:

future ....      <----> <-------------------------------------> <------>        .... past
                     w1                     w2                       w3

So I can do some processing with the new data coming (w1) to main main window (w2) and some processing on the data leaving the window (w3)

Any ideas of how can I do this in Spark? Is there a way to create sub windows? or to specify when a window should start reading?