final KeyValue kv1 = new KeyValue(one, f, q, v);
final KeyValue kv2 = new KeyValue(two, f, q, v);
// use case 1: both kvs in kvset
this.memstore.add(kv1.clone());
this.memstore.add(kv2.clone());
verifyScanAcrossSnapshot2(kv1, kv2);
// use case 2: both kvs in snapshot
this.memstore.snapshot();
verifyScanAcrossSnapshot2(kv1, kv2);