All,
thanks for your responses.
I found an excellent document here:
https://cw.sdn.sap.com/cw/message/91056#91056
the option I was looking for was "Query stripping". Once I checked on both at Query level and Document Level, I got what I wanted: the data set is as aggregated as the data table within the report indicates.
And, as expected, the response time was excellent!