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

    https://github.com/apache/spark/pull/21721#discussion_r206374910
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/streaming/progress.scala ---
    @@ -163,7 +163,8 @@ class SourceProgress protected[sql](
       val endOffset: String,
       val numInputRows: Long,
       val inputRowsPerSecond: Double,
    -  val processedRowsPerSecond: Double) extends Serializable {
    +  val processedRowsPerSecond: Double,
    +  val customMetrics: Option[JValue] = None) extends Serializable {
    --- End diff --
    
    Wait .. this is an exposed API, right? I guess this is exposed to Java API 
too (for instance `query.lastProgress().sources()`)? In that case, we should 
avoid Scala's Option and `org.json4s.*`. If this is supposed to be hidden here, 
I think we should better find a way to hide this with package level access 
modifier.
    



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