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

    https://github.com/apache/spark/pull/21222#discussion_r206342173
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/debug/package.scala ---
    @@ -116,6 +177,30 @@ package object debug {
         }
       }
     
    +  implicit class DebugStreamQuery(query: StreamingQuery) extends Logging {
    +    def debug(): Unit = {
    +      try {
    +        val w = asStreamExecution(query)
    +        if (w.lastExecution == null) {
    +          debugPrint("No physical plan. Waiting for data.")
    +        } else {
    +          val executedPlan = w.lastExecution.executedPlan
    +          if 
(executedPlan.find(_.isInstanceOf[WriteToContinuousDataSourceExec]).isDefined) {
    +            debugPrint("Debug on continuous mode is not supported.")
    +          } else {
    +            debugInternal(executedPlan)
    +          }
    +        }
    +      } catch {
    --- End diff --
    
    I prefer to remove this. There is nothing to do in this case. This 
basically means a bug in Spark: a new type is added but `asStreamExecution` is 
not updated accordingly.


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