twalthr opened a new pull request, #25928:
URL: https://github.com/apache/flink/pull/25928

   ## What is the purpose of the change
   
   This integrates the new type inference of PTFs into Calcite and the existing 
planner classes around operand checking and return type inference. In 
particular the new inference is able to deal with table arguments coming from 
`StaticArgument` signatures. Some historical shortcomings have been fixed on 
the way.
   
   
   ## Brief change log
     - Introduce a system type inference within the planner for all functions
     - Let the system type inference wrap atomic types into rows if necessary 
for (process) table functions
     - Support table arguments for both tables with row and set semantics.
     - Add extensive validation for incorrect parameters
   
   
   ## Verifying this change
   
   This change added tests and can be verified as follows: 
`ProcessTableFunctionTest`
   
   ## 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, Kubernetes/Yarn, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? yes
     - If yes, how is the feature documented? JavaDocs
   


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