[GitHub] spark pull request #18394: [SPARK-20379][core] Allow SSL config to reference...

[cloud-fan <gi...@git.apache.org>]

Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18394#discussion_r125828226
  
    --- Diff: core/src/main/scala/org/apache/spark/SparkConf.scala ---
    @@ -373,6 +373,11 @@ class SparkConf(loadDefaults: Boolean) extends Cloneable with Logging with Seria
         Option(settings.get(key)).orElse(getDeprecatedConfig(key, this))
       }
     
    +  /** Get an optional value, applying variable substitution. */
    +  private[spark] def getWithSubstitution(key: String): Option[String] = {
    --- End diff --
    
    why don't we support substitution for the normal `conf.get` API?


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