<!--
Thanks for sending a pull request!
Here are some tips for you:
1. If this is your first time, please read our contributor guidelines: https://kyuubi.readthedocs.io/en/latest/community/contributions.html
2. If the PR is related to an issue in https://github.com/apache/incubator-kyuubi/issues, add '[KYUUBI #XXXX]' in your PR title, e.g., '[KYUUBI #XXXX] Your PR title ...'.
3. If the PR is unfinished, add '[WIP]' in your PR title, e.g., '[WIP][KYUUBI #XXXX] Your PR title ...'.
-->
### _Why are the changes needed?_
<!--
Please clarify why the changes are needed. For instance,
1. If you add a feature, you can talk about the use case of it.
2. If you fix a bug, you can clarify why it is a bug.
-->
This is a sub-task of KPIP-2 #1322.
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [ ] Add screenshots for manual tests if appropriate
- [x] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#1843 from link3280/improvemnt/KYUUBI-1839.
Closes#1839
b8704274 [Paul Lin] [KYUUBI #1839] Improve docs and comments
a187a539 [Paul Lin] [KYUUBI #1839] Improve docs and comments
7c36c5ca [Paul Lin] [KYUUBI #1839] Remove unused imports
48d611db [Paul Lin] [KYUUBI #1839] Rewrite ResultSetUtil using scala
92a2e3b6 [Paul Lin] [KYUUBI #1839] Rename OperationUtil to ResultSetUtil
811d3a76 [Paul Lin] [KYUUBI #1839] Minor refactor OperationUtil
Authored-by: Paul Lin <paullin3280@gmail.com>
Signed-off-by: Cheng Pan <chengpan@apache.org>
65d50e24ee