Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/18221#discussion_r120677922
--- Diff: project/SparkBuild.scala ---
@@ -240,7 +240,8 @@ object SparkBuild extends PomBuild {
javacOptions in Compile ++= Seq(
"-encoding", "UTF-8",
- "-source", javacJVMVersion.value
+ "-source", javacJVMVersion.value,
+ "-Xlint:unchecked"
--- End diff --
This is enabling the unchecked checks, not suppressing them. I don't think
you can enable the checks in source code. And if I read things correctly, it's
enabled in the maven build (`-Xlint:all,-serial,-path`).
I can remove the flag if it really bothers people, though (I didn't notice
much extra noise from enabling it, and it helped me spot these occurrences in
the code I'm adding.)
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