Okay...
that one is easy and I kinda mentioned it already.
Once you start having a calculated column in an analytic view, the runtime object <package_name>/<view_name> is created as a wrapper calculation view.
In this wrapper the <package_name/<view_name>/olap runtime object (which is the pure analytic view w/o calc. column) is referenced.
The thing here is: even if you don't ask for the calculated column, the query will still need to go through the calc. engine in this case.
So, it really makes sense to spend some thoughts on where exactly a calculated column needs to be introduced (if this is actually required).
- Lars