alamb commented on issue #8984:
URL:
https://github.com/apache/arrow-datafusion/issues/8984#issuecomment-1914628966
> so it seems reasonable to me that we can also have LexOrdering for UDF.
However, I'm not sure how can I have LexOrdering for AggregateUDFImpl without
cyclic dependency.
Maybe we can have the AggregateUDF declare its needed ordering in terms of
`Expr`s and then translate to `LexOrdering` as part of physical planning
Perhaps we can follow the model of
```rust
pub file_sort_order: Vec<Vec<Expr>>,
```
In ListingOptions:
https://docs.rs/datafusion/latest/datafusion/datasource/listing/struct.ListingOptions.html
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