@Override
    public boolean isSingleRow() {
      if (!hasRows) {
        return false;
      }

      return isSingleRow;
    }
Setup for a match outright.
@param hashMapStore
@param refWord
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/mapjoin/fast/VectorMapJoinFastBytesHashMapStore.java