Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/17841
  
    Nobody is suggesting it doesn't work. It is at least only known to work to 
support internal callers. It is subject to changes in the API. A public API in 
contrast needs to retain compatibility over longer periods. This is not 
something it seems the project wants to guarantee. Only public APIs need docs 
and this isn't. 


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