Github user sadhen commented on the issue: https://github.com/apache/spark/pull/22577 Error Message: ``` $ dev/change-scala-version.sh 2.12 â spark git:(branch-2.4) â sbt -Dscala.version=2.12.7 sbt (spark)> project core sbt (core)> clean sbt (core)> compile [error] [warn] /Users/rendong/wdi/spark/core/src/main/scala/org/apache/spark/status/api/v1/OneApplicationResource.scala:178: Option[String] and String are unrelated: they will most likely never compare equal [error] [warn] app.attempts.filter(_.attemptId == attemptId).headOption [error] [warn] ```
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