@Override
    public void addAlias(String name, Integer index) {
      names.add(name);
      indexes.add(index);
    }
BucketCol.

An implementation of BucketSortCol which contains known aliases/indexes of equivalent columns
which data is determined to be bucketed on.
ql/src/java/org/apache/hadoop/hive/ql/optimizer/physical/BucketingSortingCtx.java