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### What changes were proposed in this pull request? This pr add a new Scala compile arg to `pom.xml` to defense against new unused imports: - `-Ywarn-unused-import` for Scala 2.12 - `-Wconf:cat=unused-imports:e` for Scala 2.13 The other fIles change are remove all unused imports in Spark code ### Why are the changes needed? Cleanup code and add guarantee to defense against new unused imports ### Does this PR introduce _any_ user-facing change? No ### How was this patch tested? Pass the Jenkins or GitHub Action Closes #30351 from LuciferYang/remove-imports-core-module. Authored-by: yangjie01 <yangjie01@baidu.com> Signed-off-by: HyukjinKwon <gurwls223@apache.org> |
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