dawidwys opened a new pull request #7932:  [FLINK-11727][formats] Fixed JSON 
format issues after serialization 
URL: https://github.com/apache/flink/pull/7932
 
 
   ## What is the purpose of the change
   
   Fixes JSON format, which did not work if it was serialized.
   
   ## Brief change log
   
    - 264922b - This commit reworks JSON format to use a runtime converter 
created based
   on given TypeInformation. Pre this commit conversion logic was based on
   reference comparison of TypeInformation which was not working after
   serialization of the format.
    - e513977 - Introduces builder pattern for JSON formats, prepares for 
making JSON formats immutable by deprecating its constructors
   
   
   ## Verifying this change
   
   * Tests for `JsonRowSerializationSchema` and `JsonRowDeserializationSchema`
   
   ## 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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