alamb commented on issue #9924:
URL: 
https://github.com/apache/arrow-datafusion/issues/9924#issuecomment-2037421727

   FWIW @jayzhan211 has a really nice API suggestion here I think 
https://github.com/apache/arrow-datafusion/pull/9920/files#r1549905825
   
   Specifically, add these two functions to the `AggregateUDFImpl`
   
   ```rust
   /// Return true if the aggregate supports `IGNORE NULL`s
   fn support_ignore_nulls() -> bool  { false }
   
   /// Return true if the aggregate supports and `ORDER BY` to specify its 
ordering:
   /// `SELECT first_value(x ORDER BY y) ... `
   fn support_ordering() -> bool { false }
   ```


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