When the server restart, the client cannot find the connection error

1. Start the IOTDB-Client and connect to the server successfully

2. Restart the server side

3. And then if you execute any command on the client, you will receive an error message: 'MSG: cannot get ID for statement'

This problem occurs after the [iotdb-291] merge, because a requeststmtid() method is added before executing the SQL statement, but this method is not the same as the previous executeQuery() method: when an error is returned, re-establish a connection and try again.

I will refer to the executeQuery() method of reconnection for repair. Of course, I think the best way is to have the client constantly check the connection. What do you think, friends?