Koen Verbeeck (11/20/2014)
I'd argue ROWCOUNT_BIG is an odd one as well, as it is not calculated over the current result set, but over the results of a previous query.
And note BOL doesn't list @@ROWCOUNT, ROWCOUNT_BIG() among aggregates.
It does in the 2008R2 version of that MSDN page.
So apparently MS realized it is a mistake to list ROWCOUNT_BIG as an aggregate.
Hence, the "correct" answer of this question is based on a mistake MS made 4 years ago.