alamb commented on issue #8347:
URL: 
https://github.com/apache/arrow-datafusion/issues/8347#issuecomment-1834584844

   > @alamb I am probably losing some pre-requisite, the Expr doesn't contain a 
WindowUDF variant but only a WindowFunction variant 
https://github.com/apache/arrow-datafusion/blob/main/datafusion/expr/src/expr.rs#L156
 there is an AggregateUDF though...
   
   You are right that the ticket description was incorrect, as @haohuaijin  
noted in 
https://github.com/apache/arrow-datafusion/issues/8347#issuecomment-1832226281
   
   I have updated it to say "rename WindowFunction` to 
`WindowFunctionDefinition`" -- sorry for the confusion
   
   I think `AggregateUDF` is covered by 
https://github.com/apache/arrow-datafusion/issues/8346
   
   


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