@Override
    public int cappedCount() {

      // The return values are capped to return ==0, ==1 and >= 2.
      return hasRows ? (isSingleRow ? 1 : 2) : 0;
    }
Setup for a match outright.
@param hashMapStore
@param refWord
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/mapjoin/fast/VectorMapJoinFastBytesHashMapStore.java