## Purpose of the pull request

<!--(For example: This pull request adds checkstyle plugin).-->

## Brief change log

<!--*(for example:)*
  - *Add maven-checkstyle-plugin to root pom.xml*
-->
## Verify this pull request

<!--*(Please pick either of the following options)*-->

This pull request is code cleanup without any test coverage.

*(or)*

This pull request is already covered by existing tests, such as *(please describe tests)*.

(or)

This change added tests and can be verified as follows:

<!--*(example:)*
  - *Added dlink-core tests for end-to-end.*
  - *Added UDFUtilTest to verify the change.*
  - *Manually verified the change by testing locally.* -->
