lincoln-lil opened a new pull request, #22881:
URL: https://github.com/apache/flink/pull/22881

   ## What is the purpose of the change
   Table hints will lost when they inside a view referenced by an external 
query, this is due to the upgrading of calcite-1.28 (affected by 
[CALCITE-4640](https://issues.apache.org/jira/browse/CALCITE-4640) which 
changed the default implementation of `SqlDialect` suppresses all table hints). 
 We should use `AnsiSqlDialect` instead to reserve table hints.
   
   ## Brief change log
   use `AnsiSqlDialect` instead to reserve table hints
   
   ## Verifying this change
   add new case into existing `OptionsHintTest` 
   
   ## 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, ZooKeeper: (no)
     - The S3 file system connector: (no)
   
   ## Documentation
     - Does this pull request introduce a new feature? (no)
   
   


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