Github user zjffdu commented on the issue:
https://github.com/apache/zeppelin/pull/1976
Is it caused by ZEPPELIN-1921 ? It works in zeppelin 0.7 but not in master.
BTW, I think these methods are a little confusing, we might need to improve
them later. @jongyoul is working on refactor the interpreter component, we
might also need to consider to clean up the APIs that those components should
expose. (InterpreterFactory, InterpreterSetting, InterpreterGroup)
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