[jira] [Created] (SPARK-13583) Enforce `UnusedImports` Java checkstyle rule

["Dongjoon Hyun (JIRA)" <ji...@apache.org>]

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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