Github user echarles commented on the issue:
https://github.com/apache/zeppelin/pull/2227
@Leemoonsoo I wanted to introduce minimum changes in javascript and stay
aligned with the idea of interpreters returning different display types.
Introducing a new `spell` display has sounded logic and easy to me. But I agree
that in this case, user has still to add a second, potentially confusing, magic
keyword to define the targeted spell.
The other way would be to consider that if interpreter returns a value that
begins with `%`, we consider it as a spell... @1ambda WDYT?
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