Github user minahlee commented on the issue:
https://github.com/apache/zeppelin/pull/1565
@tae-jun the reason I use `PUT` is that `clearAllParagraphOutput` method is
not really deleting `result` field from paragraph, but updating `result` field
to empty.
I was considering using `DELETE` but I didn't because it can confuse user
that it will literally 'DELETE' result field.
What do you think?
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