Github user VipinRathor commented on the issue:
https://github.com/apache/zeppelin/pull/2923
@Tagar, me & @prabhjyotsingh did discuss notebook authorization changes but
somehow I missed to include them. I committed those changes yesterday. Now
notebook authorization will also be mindful of username case conversion. Thanks
for pointing out!
Today, we also discovered that similar to notebook authorization,
interpreter "set permission" is another place where case conversion will be
required. I've just committed those changes as well.
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