Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3795#issuecomment-68964841
Based on some offline with @aarondav, I'm going to re-work this to not
allow Enums to be used, since the current behavior in this PR is misleading: we
can automatically do the right thing for Enums used directly as keys, but cases
like pairs of enums will still give incorrect output. Throwing a warning for
the cases that we can safely detect is a good opportunity to educate users.
I'll also add some loud warnings to the documentation if I can find a good
place.
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