docete opened a new pull request #11869:
URL: https://github.com/apache/flink/pull/11869


   ## What is the purpose of the change
   
   FLINK-17106 introduces create/drop view in Flink SQL. But we can't list 
views from TableEnvironment or SQL. This PR supports SHOW VIEWS in Flink SQL. 
BTW: We follows the Hive style which lists all tables and views with SHOW 
TABLES and lists only views with SHOW VIEWS. 
   
   ## Brief change log 
   - 546d367 Add show views syntax in sql parser
   - fe6f4d9 Add listViews interface in TableEnvironment
   - 39fb3f9 hotfix create/drop view in batch mode for legacy planner
   - 05288fe Support SHOW VIEWS in blink planner
   - 28223e2 Support SHOW VIEWS in legacy planner
   
   ## Verifying this change
   
   This change added tests 
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): (yes / **no**)
     - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (**yes** / no)
     - The serializers: (yes / **no** / don't know)
     - The runtime per-record code paths (performance sensitive): (yes / **no** 
/ don't know)
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know)
     - The S3 file system connector: (yes / **no** / don't know)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (**yes** / no)
     - If yes, how is the feature documented? (not applicable / docs / 
**JavaDocs** / not documented)
   


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