Github user jongyoul commented on the issue:
https://github.com/apache/zeppelin/pull/1846
Good catch. LGTM @felixcheung We had too big InterpreterFactory,
InterpreterSetting and InterpreterGroup. I will refactor all of this class by
next major release - 0.8.0 - and will make them testable. I think we have to do
it now. :-)
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