bowenli86 opened a new pull request #8881: [FLINK-12660][hive] Integrate Flink 
with Hive UDAF
URL: https://github.com/apache/flink/pull/8881
 
 
   ## What is the purpose of the change
   
   This PR adds support for Hive UDAF in Flink.
   
   ## Brief change log
   
   - added HiveGenericUDAF to wrap Hive UDAF and GenericUDAFResolver2
   - added unit tests
   
   ## Verifying this change
   
   This change added tests and can be verified as follows: `HiveGenericUDAFTest`
   
   ## 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, Yarn/Mesos, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes)
     - If yes, how is the feature documented? (not applicable)
   

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