[GitHub] hequn8128 opened a new pull request #6888: [FLINK-10463][table] Null literal cannot be properly parsed in Java Table API function call

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hequn8128 opened a new pull request #6888: [FLINK-10463][table] Null literal cannot be properly parsed in Java Table API function call
URL: https://github.com/apache/flink/pull/6888
 
 
   
   ## What is the purpose of the change
   
   This is a hotfix to solve Null literal parse problem in Java Table API function call. For example, the expression `Null(STRING).regexpReplace('oo|ar', '')` throws parse exception.
   
   ## Brief change log
   
     - Fix parse problem for Null literal.
     - Add documents about cast null to types.
     - Add a test to verify result.
   
   ## Verifying this change
   
   This change added tests and can be verified as follows:
   
     - Added a test for the parse
   
   ## 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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