alamb opened a new issue, #15369:
URL: https://github.com/apache/datafusion/issues/15369

                 This looks very similar to 
https://docs.rs/datafusion/latest/datafusion/physical_expr/aggregate/struct.AggregateExprBuilder.html#method.distinct
   
   Though it seems like that structure has no good example, perhaps you could 
make a PR to add an doc example of how to use it
   
   _Originally posted by @alamb in 
https://github.com/apache/datafusion/pull/14413#discussion_r2009213210_
               
   
   The idea is to add some examples in the rust API documentation showing how 
to create expressions like
   ```sql
   first_value(col ORDER BY x)
   ```
   Using the AggregateExprBuilder
   
   


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