Supportable aggregation operations?

[richardstartin]

Does it make sense to intersect two xorfilters? That is, is the bitwise intersection of two xorfilters an xorfilter with sensible false positive rate and no false negatives?

[thomasmueller]

I'm afraid with xor filters, it is not easily possible to do aggregation. At least I don't know of a way. Except, if you keep the list of keys (or at least the hashes).