Github user dongjoon-hyun commented on the pull request:
https://github.com/apache/spark/pull/11438#issuecomment-191525135
It passes the test finally. I updated the title and description of this PR
and JIRA.
To sum up,
* Remove all detected unused imports in Java (except one line in
JavaKinesisStreamSuite.java)
* Remove all observed unused imports in Scala (by manually with IntelliJ)
* Add `UnusedImports` rule to checkstyle.xml
Thanks to your advice and help, I can finish this PR.
Thank you, @srowen and @zsxwing .
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