Cpaulyz opened a new pull request, #7581:
URL: https://github.com/apache/iotdb/pull/7581

   ## Description
   
   ### IOTDB-4250
   Support multiple pipes running at the same time. 
   
![multipipe](https://user-images.githubusercontent.com/43774645/195346846-8dbf5145-19de-4ce1-8e6e-6976f594fbce.png)
   
   
   
   ### IOTDB-4628
   
   In old version, pipe infomation will be stored even if pipe has been 
dropped. There are two advantages to not storing pipe infomation after drop can.
   
   1. Support rollback logic in procedure better. If failed to create pipe, 
drop directlt.
   2. Other modules(e.g.Trigger) do the same thing. Doing so can keep the 
semantics consistent in IoTDB.
   


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