twalthr opened a new pull request #17048:
URL: https://github.com/apache/flink/pull/17048


   ## What is the purpose of the change
   
   This fixes a serious issue which also justified that 
`from/toChangelogStream` were marked as `@Experimental` in 1.13. Unique keys 
were not set correctly. Fixing it leads to even modified examples and tests 
which was accidentally classified as a planner shortcoming instead of an actual 
bug.
   
   
   ## Brief change log
   
   Set statistics for `fromChangelogStream`.
   
   ## Verifying this change
   
   This change added tests and can be verified as follows: 
`DataStreamJavaITCase`
   
   ## 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, 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? not applicable
   


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