HuangXingBo opened a new pull request #10016: 
[FLINK-14547][table-planner-blink] Fix UDF cannot be in the join condition in 
blink planner
URL: https://github.com/apache/flink/pull/10016
 
 
   ## What is the purpose of the change
   
   * This pr fix UDF cannot be in the join condition in blink planner*
    
   ## Brief change log
   
     - *In the method visit(CallExpression callExpression) of 
JoinExpressionVisitor, When the objectIdentifier field of CallExpression is 
null, it will create a unresolved CallExpression.*
   
   ## 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)
     - If yes, how is the feature documented? (not applicable)
   

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