@Override
    public ByteSegmentRef next() {
      if (!hasRows || isNextEof) {
        return null;
      }

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