Airblader opened a new pull request #15606:
URL: https://github.com/apache/flink/pull/15606


   ## What is the purpose of the change
   
   The #getSchema implementation has been deprecated and returns null by
   default, so we need to instead use the unresolved schema and derive the
   TableSchema from that to prevent exceptions.
   
   *NOTE:* Some tests in this PR now fail due to the issue fixed in 
https://github.com/apache/flink/pull/15539. I will rebase once that one is 
merged.
   
   ## Brief change log
   
   - *SqlToOperationsConverter* makes multiple calls to 
`CatalogTable#getSchema` that are replaced with `#getUnresolvedSchema`.
   
   ## Verifying this change
   
   This change is already covered by existing tests, such as 
`SqlToOperationsConverter`.
   
   ## 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/Mesos, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no
     - If yes, how is the feature documented? not applicable
   


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