dengziming opened a new pull request, #26594:
URL: https://github.com/apache/flink/pull/26594

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   ## What is the purpose of the change
   
   Fix NPE when writing null uncompact BigDecimal and Timestamp
   
   ## Brief change log
   
   since we support passing null compact BigDecimal and Timestamp, we should 
also support passing null uncompact ones.
   
   
   ## Verifying this change
   
   Please make sure both new and modified tests in this PR follow [the 
conventions for tests defined in our code quality 
guide](https://flink.apache.org/how-to-contribute/code-style-and-quality-common/#7-testing).
   
   
   This change added tests and can be verified as follows:
   
   Adding more test cases to existing cases.
   
   ## 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)`: (don't know, maybe)
     - 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, 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? (not applicable)
   


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