HeartSaVioR edited a comment on pull request #31580:
URL: https://github.com/apache/spark/pull/31580#issuecomment-780909111


   OK from what I understand from your comment is, this is informative one to 
let data source developers to "indicate" the default null ordering for ASC and 
DESC, not to provide the way to define/override to their own needs, right?
   
   (If we think the default null ordering is not clear for ASC and DESC so we 
have to have a way to indicate, what about including it to toString as well?)


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