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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