[GitHub] [incubator-iotdb] HTHou opened a new pull request #527: [IOTDB-163] Support create device template and create device

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HTHou opened a new pull request #527: [IOTDB-163] Support create device template and create device
URL: https://github.com/apache/incubator-iotdb/pull/527
 
 
   In the present version, it is a little trouble some to create a set timeseries that has the same measurements. On the other hand, although we use the conception "device" in the code, it is not properly abstracted.
   
   Expected usage:
   
   Using IoTDB in a more relational way:
   
   CREATE COMPLEX TEMPLATE vehicle (speed DOUBLE PLAIN, direction DOUBLE PLAIN, temperature DOUBLE PLAIN, fuel DOUBLE PLAIN)
   
   If all datatypes(or encodings) are the same, you can write the equal form:
   
   CREATE SIMPLE TEMPLATE vehicle MEASUREMENTS (speed, direction, temperature, fuel) DATATYPE DOUBLE ENCODING PLAIN
   
   Then you will be able to create time series in an easier way:
   
   CREATE DEVICE (vehicle) root.sg1.vehicle1
   
   Which equals:
   
   CREATE TIMESERIES root.sg1.vehicle1.speed WITH DATATYPE=DOUBLE,ENCODING=PLAIN
   
   CREATE TIMESERIES root.sg1.vehicle1.direction WITH DATATYPE=DOUBLE,ENCODING=PLAIN
   
   CREATE TIMESERIES root.sg1.vehicle1.fuel WITH DATATYPE=DOUBLE,ENCODING=PLAIN
   
   CREATE TIMESERIES root.sg1.vehicle1.temperature WITH DATATYPE=DOUBLE,ENCODING=PLAIN

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