this is a common pattern used in RDMS, is there some existing idiom to do it in cassandra ?
if the size of "select * from A where id == a " is very large, and similarly for B, while the join of A.id == a and B.id==b is small, then doing a get() for both and then merging seems excessively slow. my fall-back approach is, since A and B do not change a lot, I'll pre-generate the join of A and B (not very large) keyed on A.id + B.id, then do the get(a+b) thanks Yang
