HyukjinKwon commented on a change in pull request #30351:
URL: https://github.com/apache/spark/pull/30351#discussion_r531394220
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File path: pom.xml
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@@ -164,6 +164,7 @@
<commons.collections.version>3.2.2</commons.collections.version>
<scala.version>2.12.10</scala.version>
<scala.binary.version>2.12</scala.binary.version>
+ <scalac.arg.unused-imports>-Ywarn-unused-import</scalac.arg.unused-imports>
Review comment:
We can give a shot. Are they a lot of instances of `unused-locals` to
fix? If there are too many, I think we should collect some more feedback from
other committers because it makes more difficult to maintain the codes (e.g.,
reverting and backporting).
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