public void setAliases(List<String> aliases) {
    this.tableAliases = aliases;
  }
NamedColsInJoin encapsulates information about using clause of join. e.g.,
select * from a join b using(c); This class describes tables a and b, column
c and join type.
ql/src/java/org/apache/hadoop/hive/ql/parse/NamedJoinInfo.java