Github user Tagar commented on the issue:
https://github.com/apache/zeppelin/pull/2963
Thanks for fixing this - I just had a chance to test and confirm it fixes
number sorting.
PR title reads "Number sorting issue", but code change seems tries to
address String and Date sorting issues too?
I see String sorting is still not correct even with this PR applied:

'Abba' should be at the top. It seems sort strings while ignoring their
case?
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