[GitHub] cloud-fan opened a new pull request #23619: [SPARK-26695][SQL] data source v2 API refactor - continuous read

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cloud-fan opened a new pull request #23619: [SPARK-26695][SQL] data source v2 API refactor - continuous read
URL: https://github.com/apache/spark/pull/23619
 
 
   ## What changes were proposed in this pull request?
   
   Following https://github.com/apache/spark/pull/23430, this PR does the API refactor for continuous read, w.r.t. the [doc](https://docs.google.com/document/d/1uUmKCpWLdh9vHxP7AWJ9EgbwB_U6T3EJYNjhISGmiQg/edit?usp=sharing)
   
   The major changes:
   1. rename `XXXContinuousReadSupport` to `XXXContinuousStream`
   2. at the beginning of continuous streaming execution, convert `StreamingRelationV2` to `StreamingDataSourceV2Relation` directly, instead of `StreamingExecutionRelation`.
   3. remove all the hacks as we have finished all the read side API refactor
   
   ## How was this patch tested?
   
   existing tests

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