[GitHub] [flink] HuangZhenQiu opened a new pull request #9689: [FLINK-7151] add a basic function ddl

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

HuangZhenQiu opened a new pull request #9689: [FLINK-7151] add a basic function ddl
URL: https://github.com/apache/flink/pull/9689
 
 
   ## What is the purpose of the change
   
   Add basic function DDL in Parser and register function to the table environments
   
   ## Brief change log
   
   1) Add SqlCreateFunction and SqlDropFunction DDL sql Call
   2) Add CreatFunction and DropFunction operations
   
   ## Verifying this change
   1) Add test cases in FlinkSqlParserImplTest for parser verify on function DDL.
   2) Add test cases in SqlToOperationConverterTest for planner verification.
   
   ## 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 documented)
   

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