lincoln-lil opened a new pull request, #20763:
URL: https://github.com/apache/flink/pull/20763

   ## What is the purpose of the change
   This is a minor refactor for the naming (align with the upsert key 
metadata). 
   But better to be included in 1.16 since the attribute name of  exec join 
node also changed.
   
   ## Brief change log
   rename getUniqueKeys to getUpsertKeys in CommonPhysicalJoin
   
   ## Verifying this change
   existing JoinJsonPlanTest
   
   ## 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)


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