@Override
  public void returnAfterUse(TezSessionPoolSession session) throws Exception {
    returnSession(session);
  }
@param conf HiveConf that is used to initialize the session
@param queueName could be null. Set in the tez session.
@param doOpen
@return
@throws Exception
ql/src/java/org/apache/hadoop/hive/ql/exec/tez/TezSessionPoolManager.java