KEEPFILTERS: a new DAX feature to correctly compute over arbitrary shaped sets

Having read this question on the mdsn blogs, I investigated on the KEEPFILTERS function and, after having learned it, it is now time to write about it. Moreover, before start to write about it, I need to thank the dev team of SSAS and Marco Russo who helped me understanding this complex topic.

This blog post is not an easy one, so let me start with some conclusions, in order to let you understand why you need to read the post up to the end and digest its content.