beyond1920 opened a new pull request #15003:
URL: https://github.com/apache/flink/pull/15003


   ## What is the purpose of the change
   
   This pull request aims to fix a minor bug in `FlinkRelMdWindowProperties` 
when infer WindowProperties of `Expand`.  Add more cases to test grouping set 
syntax for WindowAggregate.
   
   
   ## Brief change log
   - Update infer for Expand in `FlinkRelMdWindowProperties` 
   - Add more cases to test grouping set syntax for WindowAggregate
   
   ## Verifying this change
     - UT/IT
   
   ## 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? (not applicable)
   


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