@Override
  public MapJoinKey putRow(Writable currentKey, Writable currentValue)
      throws SerDeException, HiveException, IOException {
    long hashCode = INSTANCE.getHashCode((BytesWritable) currentKey);
    INSTANCE.putRow(hashCode, (BytesWritable) currentKey, (BytesWritable) currentValue);
    return null;
  }
HashTableLoader for Tez constructs the hashtable from records read from
a broadcast edge.
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/mapjoin/fast/VectorMapJoinFastTableContainer.java