protected void serializeColumns(Subscriber<? super AtomWritable> subscriber, byte[] rowKey, long deletedAt, int count,
DataInput columns) throws IOException {
for (int i = 0; i < count; i++) {
// serialize columns
OnDiskAtom atom = serializer.deserializeFromSSTable(columns, version);
subscriber.onNext(new AtomWritable(rowKey, deletedAt, atom));
}
}