twalthr opened a new pull request #9382: [FLINK-13600][table] Rework 
TableEnvironment.connect() class hierarchy
URL: https://github.com/apache/flink/pull/9382
 
 
   ## What is the purpose of the change
   
   This fixes the currently broken `TableEnvironment.connect()` API by 
reworking the descriptor class hierarchy. `TableDescriptor` now contains most 
of the logic and `ConnectTableDescriptor` is the return type of table 
environments (expect for legacy Batch/StreamTableDescriptors).
   
   The API is still mostly source code compatible.
   
   ## Brief change log
   
   - Return `ConnectTableDescriptor`
   - Merge ConnectorFormatDescriptor, StreamableDescriptor, and TableDescriptor
   - Merge RegistrableDescriptor and ConnectTableDescriptor
   
   ## Verifying this change
   
   A new `TableEnvironmentTest` tests the implementation.
   
   ## 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)`: yes
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, 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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