Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21399#discussion_r189968751
--- Diff: project/plugins.sbt ---
@@ -1,3 +1,11 @@
+addSbtPlugin("com.etsy" % "sbt-checkstyle-plugin" % "3.1.1")
+
+// sbt-checkstyle-plugin uses an old version of checkstyle. Match it to
Maven's.
+libraryDependencies += "com.puppycrawl.tools" % "checkstyle" % "8.2"
+
+// checkstyle uses guava 23.0.
+libraryDependencies += "com.google.guava" % "guava" % "23.0"
--- End diff --
Yea but it's plugin dependency. I was a little surprised too because I was
stuck here for a while.
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