@Override
  public void putRow(long hashCode, BytesWritable currentKey, BytesWritable currentValue)
      throws SerDeException, HiveException, IOException {
    // We are not using the key and value contexts, nor do we support a MapJoinKey.
    INSTANCE.putRow(hashCode, currentKey, currentValue);
  }
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