[I] Dataframe doesn't properly implement ArrowStream export interface [datafusion-python]

[via GitHub]

johnnyg opened a new issue, #1166:
URL: https://github.com/apache/datafusion-python/issues/1166

   **Describe the bug**
   When trying to pass a dataframe to another library that expects an 
[ArrowStream export 
interface](https://arrow.apache.org/docs/format/CDataInterface/PyCapsuleInterface.html#arrowstream-export)
 we get the following error:
   ```python
   TypeError: argument 'input': DataFrame.__arrow_c_stream__() missing 1 
required positional argument: 'requested_schema'
   ```
   this is because the `requested_schema` argument should be optional but it's 
not.
   
   **To Reproduce**
   ```python
   from arro3.core import RecordBatchReader
   import datafusion
   
   data = [{"num": 42}]
   ctx = datafusion.SessionContext()
   df = ctx.from_pylist(data)
   reader = RecordBatchReader.from_arrow(df)
   ```
   
   **Expected behavior**
   The above to run without error
   
   **Additional context**
   Replacing `RecordBatchReader.from_arrow(df)` with 
`RecordBatchReader.from_arrow(df.df)` works around the bug


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