TsReaper opened a new pull request #12073:
URL: https://github.com/apache/flink/pull/12073


   ## Pre-review note
   
   This PR is waiting for #12037 and #12069 to merge. The first two commits are 
exactly the same with the blocking PRs. Please start reviewing from the 3rd 
commit. This PR will be rebased once the blocking PRs are merged.
   
   ## What is the purpose of the change
   
   This PR is part of the 
[FLINK-14807](https://issues.apache.org/jira/browse/FLINK-14807) which is going 
to introduce a collecting method for tables. See 
[here](https://docs.google.com/document/d/13Ata18-e89_hAdfukzEJYreOg2FBZO_Y0RohLDAme6Y/edit)
 for the whole design document.
   
   This PR introduces two specialized collecting iterator to Blink planner. One 
iterator aims to deliver the results as fast as possible, while the other 
focuses on providing exactly-once semantics.
   
   ## Brief change log
   
   - Add specialized collecting iterator to Blink planner
   
   ## Verifying this change
   
   This change can be verified by running the newly added unit tests.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: no
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no
     - If yes, how is the feature documented? no
   


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