Github user tae-jun commented on the issue: https://github.com/apache/zeppelin/pull/1630 @AhyoungRyu Sorry for my late response! But it's due to tests :) I reproduced the error you mentioned and you were right! Furthermore, chasing a reason of the error, I notice that there are more possibilities of error. So I wrote more codes and added more test cases. ## Folder merging test  ## Renaming a high depth folder test  I thought this new feature is simple to implement... but now I don't think so...^^; I tested a lot of times, but maybe there are more bugs. So please test this when you have some time. Thanks ð
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