Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/23252#discussion_r239900826
--- Diff: core/src/test/scala/org/apache/spark/SecurityManagerSuite.scala
---
@@ -18,8 +18,11 @@
package org.apache.spark
import java.io.File
+import java.nio.charset.StandardCharsets
--- End diff --
Unnecessary (see next line).
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