extending AbstractRichFunction gives access to the open function which is
called at init if I understand correctly.
That works fine with RichMapFunction, but with RichWindowMapFunction which also
extends AbstractRichFunction the open function never seems to get called.
I also tried extending AbstractRichFunction and implementing
AbstractRichFunction but that does not help with this.. so it seems like the
open function is just never called when setting up a mapWindow transform.
I'm using 0.9-milestone1
Is this a bug?Thanks
