@Override
    public String getName() {
        return "RANK";
    }
Represents the rank operator, which only orders the result set and
does not change which hits are returned.

The first argument is the part selecting the result set, the
following operands are used to order the result and does not affect
which hits are returned.

@author bratseth
container-search/src/main/java/com/yahoo/prelude/query/RankItem.java