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

    https://github.com/apache/spark/pull/20922#discussion_r177863902
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/test/SQLTestUtils.scala ---
    @@ -64,6 +64,7 @@ private[sql] trait SQLTestUtils extends SparkFunSuite 
with SQLTestUtilsBase with
         if (loadTestDataBeforeTests) {
           loadTestData()
         }
    +    SparkSession.setActiveSession(spark)
    --- End diff --
    
    The active session should be set before we execute the plan, right? For 
example, in QueryExecution for each query. What is the reason we need to do it 
here?


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