Github user junyangq commented on the issue:

    https://github.com/apache/spark/pull/14705
  
    Yeah, I totally agree that in terms of usage this is safer. Then the doc 
for `...` would be an issue. If we keep to the principle that doc be close to 
the function, then `...` would be in generic part. That  seems not what we want 
to do. Putting it above the function definition is also a little weird since 
there is not `...` in the arguments of the function itself. No sure which is 
the best way though...


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