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

    https://github.com/apache/spark/pull/18884#discussion_r132440406
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileFormatWriter.scala
 ---
    @@ -269,50 +278,60 @@ object FileFormatWriter extends Logging {
       }
     
       /**
    +   * For every registered [[WriteJobStatsTracker]], call `processStats()` 
on it, passing it
    +   * the corresponding [[WriteTaskStats]] from all executors.
    +   */
    +  private def processStats(
    +      statsTrackers: Seq[WriteJobStatsTracker],
    +      statsPerTask: Seq[Seq[WriteTaskStats]])
    +    : Unit = {
    +
    +    val numStatsTrackers = statsTrackers.length
    +    assert(statsPerTask.forall(_.length == numStatsTrackers),
    +      s"""Every WriteTask should have produced one `WriteTaskStats` object 
for every tracker.
    +         |There are ${numStatsTrackers} statsTrackers, but some task 
returned
    --- End diff --
    
    nit: `$numStatsTrackers`


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