cloud-fan opened a new pull request #23981: [SPARK-27064][SS] create 
StreamingWrite at the beginning of streaming execution
URL: https://github.com/apache/spark/pull/23981
 
 
   ## What changes were proposed in this pull request?
   
   According to the 
[design](https://docs.google.com/document/d/1vI26UEuDpVuOjWw4WPoH2T6y8WAekwtI7qoowhOFnI4/edit?usp=sharing),
 the life cycle of `StreamingWrite` should be the same as the read side 
`MicroBatch/ContinuousStream`, i.e. each run of the stream query, instead of 
each epoch.
   
   This PR fixes it.
   
   ## How was this patch tested?
   
   existing tests

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