Github user jerryshao commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21495#discussion_r196992852
  
    --- Diff: 
repl/scala-2.11/src/main/scala/org/apache/spark/repl/SparkILoopInterpreter.scala
 ---
    @@ -21,8 +21,22 @@ import scala.collection.mutable
     import scala.tools.nsc.Settings
     import scala.tools.nsc.interpreter._
     
    -class SparkILoopInterpreter(settings: Settings, out: JPrintWriter) extends 
IMain(settings, out) {
    -  self =>
    +class SparkILoopInterpreter(settings: Settings, out: JPrintWriter, 
initializeSpark: () => Unit)
    +    extends IMain(settings, out) { self =>
    --- End diff --
    
    Well, there's a bunch of code in Spark where both 4-space and 2-space 
indentation are existed.  From my thought it is not so worthy to stick to this 
tiny point.
    
    If you want to fix it, then creating a separate PR to fix all of them.


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