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

    https://github.com/apache/spark/pull/16962#discussion_r101655346
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/util/DataFrameCallbackSuite.scala 
---
    @@ -159,4 +161,56 @@ class DataFrameCallbackSuite extends QueryTest with 
SharedSQLContext {
     
         spark.listenerManager.unregister(listener)
       }
    +
    +  test("execute callback functions for DataFrameWriter") {
    +    val commands = ArrayBuffer.empty[(String, LogicalPlan)]
    +    val exceptions = ArrayBuffer.empty[(String, Exception)]
    +    val listener = new QueryExecutionListener {
    +      // Only test successful case here, so no need to implement 
`onFailure`
    --- End diff --
    
    invalid comment?


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