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

    https://github.com/apache/spark/pull/16108#discussion_r90548243
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamingQueryListenerSuite.scala
 ---
    @@ -191,6 +192,48 @@ class StreamingQueryListenerSuite extends StreamTest 
with BeforeAndAfter {
         assert(queryQueryTerminated.exception === newQueryTerminated.exception)
       }
     
    +  test("noDataReportInterval") {
    +    withSQLConf(SQLConf.STREAMING_NO_DATA_REPORT_INTERVAL.key -> "100ms") {
    +      @volatile var progressEventCount = 0
    +
    +      val listener = new StreamingQueryListener {
    --- End diff --
    
    can you write a short explanation on what this test does. it hard to 
understand. 


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