vprus opened a new pull request #4074:
URL: https://github.com/apache/zeppelin/pull/4074
The existing comparator would return -1 for both (a, b) and (b, a),
if both of these settings keys are not present in the template,
and such behaviour violates required comparator properties.
The issue manifests with exception in the form
java.lang.IllegalArgumentException: Comparison method violates its
general contract!
at java.util.TimSort.mergeLo(TimSort.java:777)
and prevents server from starting up.
### Questions:
* Does the licenses files need update? I think so, the change is trivial.
* Is there breaking changes for older versions? No.
* Does this needs documentation? No.
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