Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/2245
@felixcheung It won't break existing notebook. It would load existing
notebook properly and convert it into new formats. Test for old input forms is
here
https://github.com/apache/zeppelin/pull/2245/files#diff-d81697bfa1ac27c181c7f9a74f21c792R77
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