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https://issues.apache.org/jira/browse/SPARK-33441?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17246205#comment-17246205
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Hyukjin Kwon commented on SPARK-33441:
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Java side it's done in https://issues.apache.org/jira/browse/SPARK-13583
> 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
> Assignee: Yang Jie
> Priority: Minor
> Fix For: 3.1.0
>
>
> * 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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