vesense opened a new pull request #824: [IOTDB-503] Add checkTimeseriesExists 
for session
URL: https://github.com/apache/incubator-iotdb/pull/824
 
 
   In most scenarios, we should check whether timeseries already exists before 
creating, otherwise the following exception may be thrown from server:
   
    
   
   > org.apache.iotdb.db.exception.query.QueryProcessException: Timeseries 
[root.sg.d1.s1] already 
existorg.apache.iotdb.db.exception.query.QueryProcessException: Timeseries 
[root.sg.d1.s1] already exist at 
org.apache.iotdb.db.qp.executor.QueryProcessExecutor.createTimeSeries(QueryProcessExecutor.java:552)
 at 
org.apache.iotdb.db.qp.executor.QueryProcessExecutor.processNonQuery(QueryProcessExecutor.java:122)
 at 
org.apache.iotdb.db.service.TSServiceImpl.executeNonQuery(TSServiceImpl.java:1044)
 at 
org.apache.iotdb.db.service.TSServiceImpl.executePlan(TSServiceImpl.java:1387) 
at 
org.apache.iotdb.db.service.TSServiceImpl.createTimeseries(TSServiceImpl.java:1342)
 at 
org.apache.iotdb.service.rpc.thrift.TSIService$Processor$createTimeseries.getResult(TSIService.java:1953)
 at 
org.apache.iotdb.service.rpc.thrift.TSIService$Processor$createTimeseries.getResult(TSIService.java:1933)
 at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:38) at 
org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:38) at 
org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:313)
 at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 
at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 
at java.lang.Thread.run(Thread.java:748)
   
    The changes are as following:
   * Added method `checkTimeseriesExists` for `org.apache.iotdb.session.Session`
   * Updated the `SessionExample` 
   
   

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