@Override
  public String toString() {
    return "sessionId=" + sessionId + ", queueName=" + queueName + ", user=" + user
        + ", doAs=" + doAsEnabled + ", isOpen=" + isOpen() + ", isDefault=" + defaultQueue;
  }
Constructor. We do not automatically connect, because we only want to
load tez classes when the user has tez installed.
ql/src/java/org/apache/hadoop/hive/ql/exec/tez/TezSessionState.java