public void addPathToAlias(Path path, String newAlias){
    List<String> aliases = pathToAliases.get(path);
    if (aliases == null) {
      aliases = new ArrayList<>(1);
      StringInternUtils.internUriStringsInPath(path);
      pathToAliases.put(path, aliases);
    }
    aliases.add(newAlias.intern());
  }
Whether LLAP IO will be used for inputs.
ql/src/java/org/apache/hadoop/hive/ql/plan/MapWork.java