Unnecessary ReadRepair request during RangeScan

class RangeSliceResponseResolver {
    // ....
    private class Reducer extends MergeIterator.Reducer<Pair<Row,InetAddress>, Row>
    {
    // ....

        protected Row getReduced()
        {
            ColumnFamily resolved = versions.size() > 1
                                  ? RowRepairResolver.resolveSuperset(versions)
                                  : versions.get(0);
            if (versions.size() < sources.size())
            {
                for (InetAddress source : sources)
                {
                    if (!versionSources.contains(source))
                    {
                          
                        // [PA] Here we are adding null ColumnFamily.
                        // later it will be compared with the "desired"
                        // version and will give us "fake" difference which
                        // forces Cassandra to send ReadRepair to a given source
                        versions.add(null);
                        versionSources.add(source);
                    }
                }
            }
            // ....
            if (resolved != null)
                repairResults.addAll(RowRepairResolver.scheduleRepairs(resolved, table, key, versions, versionSources));
            // ....
        }
    }
}

public class RowRepairResolver extends AbstractRowResolver {
    // ....
    public static List<IAsyncResult> scheduleRepairs(ColumnFamily resolved, String table, DecoratedKey<?> key, List<ColumnFamily> versions, List<InetAddress> endpoints)
    {
        List<IAsyncResult> results = new ArrayList<IAsyncResult>(versions.size());

        for (int i = 0; i < versions.size(); i++)
        {
            // On some iteration we have to compare null and resolved which are obviously
            // not equals, so it will fire a ReadRequest, however it is not needed here
            ColumnFamily diffCf = ColumnFamily.diff(versions.get(i), resolved);
            if (diffCf == null)
                continue;
        // ....