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Split cudf-polars AST validation and translation #20397
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    This changes `to_ast` and its usage to split up its validation function from its translation function. Closes rapidsai#20372
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                    TomAugspurger
  
              
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                    Oct 29, 2025 
                  
              
              
            
            
              
                    TomAugspurger
  
              
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                    Oct 29, 2025 
                  
              
              
            
            
              
                    TomAugspurger
  
              
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                    Oct 29, 2025 
                  
              
              
            
            
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           /ok to test eb45ee5  | 
    
              
                    TomAugspurger
  
              
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                    Oct 30, 2025 
                  
              
              
            
            
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           /ok to test 8aede7e  | 
    
  
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      Labels
      
    cudf-polars
  Issues specific to cudf-polars 
  
    improvement
  Improvement / enhancement to an existing function 
  
    non-breaking
  Non-breaking change 
  
    Python
  Affects Python cuDF API. 
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Description
This changes
to_astand its usage to split up its validation role from its translation role. The goal is to ensure that the translation, which makes pylibcudf Scalar objects, can be run in anIR.do_evaluatecontext with access to a CUDA stream.The major downside of this new implementation is the duplicated code between the validation and translation paths. Determining whether a particular operation is support isn't always trivial. I'll see whether that can be improved.
Closes #20372