Yang Jie created SPARK-33441:
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Summary: Add "unused-import" compile arg to scalac and remove all
unused imports in Scala code
Key: SPARK-33441
URL: https://issues.apache.org/jira/browse/SPARK-33441
Project: Spark
Issue Type: Improvement
Components: Spark Core, SQL
Affects Versions: 3.1.0
Reporter: Yang Jie
* Add new scala compile arg to defense against new unused imports:
** "-Ywarn-unused-import" for Scala 2.12
** "-Wconf:cat=unused-imports:ws" or "-Wconf:cat=unused-imports:error" for
Scala 2.13
* Remove all unused imports in Scala code
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