houqp commented on issue #1544:
URL: 
https://github.com/apache/arrow-datafusion/issues/1544#issuecomment-1013625127


   > I don't know if outside of a custom DataFrame impl this would be possible 
in a contrib module.
   
   If this is not clear from the get go, you can also complete the PoC within 
datafusion and then we can look at the diff together to see which part should 
be factored out into extensions.
   
   >  I guess the struggle I am facing here is it seems like the dataframe 
right now has to get a "wait or end" of data reading notification
   
   I am also not following the question here. The `SendableRecordBatchStream` 
returned from `execute_stream` should be able to represent a never ending 
stream. Do you have a more concrete example of what you are trying to achieve?
   
   


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