If a query takes too much time, we'd better interrupt this query instead of hanging up the client.
The design doc is in [1]. Any advice is appreciated :D A discussion is: How long can the query be considered as time out? maybe 5min, 10min? We need to set a default value, of course it can be modified by the user. [1] https://cwiki.apache.org/confluence/display/IOTDB/Query+over+time+design+doc -- Best, Xiangwei Wei
