Dongjoon Hyun created SPARK-13583:
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Summary: Enforce `UnusedImports` Java checkstyle rule
Key: SPARK-13583
URL: https://issues.apache.org/jira/browse/SPARK-13583
Project: Spark
Issue Type: Task
Reporter: Dongjoon Hyun
Priority: Trivial
After SPARK-6990, `dev/lint-java` keeps Java code healthy and helps PR review
by saving much time.
This issue aims to enforce `UnusedImports` rule by adding a `UnusedImports`
rule to `checkstyle.xml` and fixing all existing unused imports.
{code:title=checkstyle.xml|borderStyle=solid}
+ <module name="UnusedImports"/>
{code}
This will also prevent the upcoming PR from having unused imports.
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