code: private Iterator<Map.Entry<DeltaClusteringKey, Change>> decodeChangesFromCql(final Iterator<StitchedRow> iter) {
          return Iterators.transform(iter, row ->
                  Maps.immutableEntry(new DeltaClusteringKey(getChangeId(row), row.getNumBlocks()), _changeEncoder.decodeChange(getChangeId(row), _daoUtils.skipPrefix(getValue(row)))));
      }
docs: Converts a list of rows into Change instances.