Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/4257#issuecomment-72408451
@rxin I have noticed that very few users know about `toDebugString`. Maybe
we should open a JIRA to add better documentation for that function (i.e.
discuss it in the programming guide). Overall, I agree with you and @ScrapCodes
in that I'm not sure this particular flag is super useufl.
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