matthewmturner commented on pull request #1922:
URL: 
https://github.com/apache/arrow-datafusion/pull/1922#issuecomment-1058877548


   @alamb would you mind checking this out to see if going in right direction?  
I took the logic for writing csvs and put it in new function `plan_to_csv` 
within `src/physical_plan/file_format/csv` and moved testing there.  Then just 
used that function in both `ExecutionContext` and `DataFrame`
   
   currently failing because of the signature of `write_csv` having `impl 
AsRef<str>` which i took from the existing implementation on `ExecutionContext` 
but doesnt work because trait object cant have method with generic type 
parameter.  Is there a reason we cant use `&str`?  More details here 
https://doc.rust-lang.org/error-index.html#E0038  and i dont think any of the 
proposed workarounds are good for our use case.


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