[GitHub] [flink] dawidwys opened a new pull request #8358: [FLINK-12431][table-api-java] Port utility methods for extracting fields information from TypeInformation

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dawidwys opened a new pull request #8358: [FLINK-12431][table-api-java] Port utility methods for extracting fields information from TypeInformation
URL: https://github.com/apache/flink/pull/8358
 
 
   ## What is the purpose of the change
   
   This PR ports methods like `getFieldInfo` to java to api-java module. This is needed in order to create `TableOperation` from `DataStream`/`DataSet` in the api layer.
   
   ## 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): (yes / **no**)
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**)
     - The serializers: (yes / **no /** don't know)
     - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know)
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know)
     - The S3 file system connector: (yes / **no** / don't know)
   
   ## Documentation
   
     - Does this pull request introduce a new feature? (yes / **no**)
     - If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented)
   

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