how do I append another QuerySnapshot to a QuerySnapshot?
static final CollectionReference _col = FirebaseFirestore.instance.collection('post');
Stream<QuerySnapshot<Object?>> query = _col.where('firstReleaseDate', isLessThanOrEqualTo: Timestamp.now()).snapshots();
QuerySnapshot ss = await _col
.query() <-----append here
.orderBy(field, descending: isDescending)
.startAfterDocument(lastDoc)
.limit(limit)
.get()
.timeout(TIMEOUT_DURATION);