public void replaceTabAlias(String oldAlias, String newAlias) {
    ExprNodeDescUtils.replaceTabAlias(getConf().getColumnExprMap(), oldAlias, newAlias);
    for (Operator<? extends OperatorDesc> c : getChildOperators()) {
      c.replaceTabAlias(oldAlias, newAlias);
    }
  }
Compares the whole operator tree with the other.
ql/src/java/org/apache/hadoop/hive/ql/exec/Operator.java