@Override
  public VectorMapJoinHashMapResult getNonMatchedHashMapResult() {
    if (nonMatchedHashMapResult == null) {
      nonMatchedHashMapResult = new HashMapResult(nonMatchedIterator.getHashMapResult());
    }
    nonMatchedHashMapResult.setJoinResult(JoinResult.MATCH);
    return nonMatchedHashMapResult;
  }
The abstract class for vectorized non-match Small Table key iteration.
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/mapjoin/optimized/VectorMapJoinOptimizedNonMatchedIterator.java