Github user prabhjyotsingh commented on the issue:
https://github.com/apache/zeppelin/pull/2481
Well, any test case calling `open()` will hit `isKerboseEnabled()`, and in
`JdbcInterpreterTest` when ever `isKerboseEnabled` function is called will
returning false all the time.
Ref:
https://github.com/apache/zeppelin/blob/master/jdbc/src/main/java/org/apache/zeppelin/jdbc/JDBCInterpreter.java#L173
https://github.com/apache/zeppelin/blob/master/zeppelin-interpreter/src/main/java/org/apache/zeppelin/interpreter/KerberosInterpreter.java#L64
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