JingsongLi opened a new pull request #9909: [FLINK-14381][table] Partition 
field names should be got from CatalogTable instead of source/sink
URL: https://github.com/apache/flink/pull/9909
 
 
   ## What is the purpose of the change
   
   Now PartitionableTableSource and PartitionableTableSink have 
"getPartitionFieldNames" method, this should be removed, and planner rules 
should get it from CatalogManager.
   
   The partition field names are the information of Table, source/sink should 
only be fed with such information but not get them out of it.
   
   ## Brief change log
   
   See commits.
   
   ## Verifying this change
   
   This change is already covered by existing tests.
   
   ## 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, Yarn/Mesos, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no

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