[GitHub] [flink] hequn8128 opened a new pull request #8669: [FLINK-11147][table][docs] Add documentation for TableAggregate Function

[GitBox <gi...@apache.org>]

hequn8128 opened a new pull request #8669: [FLINK-11147][table][docs] Add documentation for TableAggregate Function
URL: https://github.com/apache/flink/pull/8669
 
 
   
   ## What is the purpose of the change
   
   This pull request add documentation for TableAggregateFunction. 
   
   Note: as discussed in the [PR of FLINK-12401](https://github.com/apache/flink/pull/8550#issuecomment-498913495), we will have `eimitUpdateWithRetract` and `emitUpdateWithoutRetract` two methods to improve the performance of streaming jobs. However, due to the current status that key definition on TableAggregateFunction is still under discussion now, this PR will not cover the `eimitUpdateWithRetract` method. We can open another PR to add document about `eimitUpdateWithRetract` later. This can unblock these tasks.
   
   
   ## Brief change log
   
     - Add documentation for TableAggregate Function
     - Add chinese documentation for TableAggregate Function
     - Update document about Aggrgate Function
   
   
   ## Verifying this change
   
   execute ` build_docs.sh` in local and check the changes. 
   
   ## 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? (no)
   

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