twalthr opened a new pull request #11225: [FLINK-16261][table] Use type 
compatibility consistently to avoid casting
URL: https://github.com/apache/flink/pull/11225
 
 
   ## What is the purpose of the change
   
   In many cases, full type equality is not necessary. Especially when leaving 
the table ecosystem to sinks or UDFs a clear definition of "type compatibility" 
is important. This commit defines the type compatibility for all logical types 
to avoid unnecessary casting and less type inequality exceptions.
   
   ## Brief change log
   
   - Clear definition of when to avoid casting
   - All calls to LogicalType.equals() revisited
   - Replaced by `LogicalTypeCasts.supportsAvoidingCasts`
   
   ## Verifying this change
   
   Existing tests for type inference and `FunctionITCase` have been updated.
   
   ## 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? JavaDocs
   

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