[PR] [FLINK-38750][table] Validation of queries with functions erroneously invoked under select fails with StackOverflow

snuyanzin opened a new pull request, #27287:
URL: https://github.com/apache/flink/pull/27287

   
   ## What is the purpose of the change
   
   The PR is to fix `StackOverflow` for queries like
   ```sql
   SELECT coalesce(SELECT invalid);
   ```
   
   ## Brief change log
   
   ## Verifying this change
   
   There are tests added
   
   ## 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)
     - If yes, how is the feature documented? (not applicable)
   


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