Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/17941
Hi, @felixcheung .
IMO, this is just a confirmation on interface. This will only help future
contributors (including you) make a PR on the implementation.
Or, if you want to include this PR in your PR, please make your PR first. I
will take a look at that and close this happily.
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