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

    https://github.com/apache/spark/pull/17537#discussion_r109858642
  
    --- Diff: 
core/src/main/scala/org/apache/spark/internal/config/ConfigBuilder.scala ---
    @@ -147,6 +147,15 @@ private[spark] class TypedConfigBuilder[T](
         }
       }
     
    +  /** Creates a [[ConfigEntry]] with a function has a default value */
    +  def createWithDefaultFunction(defaultFunc: () => T): ConfigEntry[T] = {
    +    val entry =
    +      new ConfigEntryWithDefaultFunction[T](parent.key, defaultFunc, 
converter,
    +      stringConverter, parent._doc, parent._public)
    --- End diff --
    
    nit
    ```
    val entry = new XXX(
      param1, param2, ...)
    ```


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