Guanhua Li

[Improvement] [LDAP] Config value should return real null instead of 'null' string

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## Purpose of the pull request Currently if LDAP Config value is not set, DS would get String "null" as default value instead of real null currently. #11324 This PR...

[ZEPPELIN-5612] Upgrade junit 4 to 5

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### What is this PR for? 1. Upgrade junit 4 to 5, then we can write junit 5 tests and migrate junit 4 tests to 5. 2. Run the existing...

[ZEPPELIN-5694] Support apache kyuubi

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### What is this PR for? Give an example to use Apache Kyuubi in JDBC interpreter. ### What type of PR is it? Documentation *Please leave your type of PR...

[ZEPPELIN-5815] Frontend CI jobs improvement

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### What is this PR for? This PR is to improve a some step in Frontend CI jobs. There are two command in this step in file `frontend.yml` as follow:...

[ZEPPELIN-5493] Remove prefix in jdbc interpreter

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### What is this PR for? Currently, zeppelin allow user to run multiple kinds of sql in one interpreter, e.g. ``` %jdbc(db=mysql) %jdbc(db=hive){code} ```   But this would make jdbc interpreter...

This PR is to add ping method in python Client to check connection with remote application. Currently the `ping` method is not provided in python client. I think it is...