[GitHub] spark issue #22577: [CORE][MINOR] Fix obvious error and compiling for Scala ...

[sadhen]

Github user sadhen commented on the issue:

    https://github.com/apache/spark/pull/22577
  
    Error Message:
    
    ```
    $ dev/change-scala-version.sh 2.12
    
    
    ➜  spark git:(branch-2.4) ✗ 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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