wangyum commented on a change in pull request #26768: [SPARK-30141][SQL][TESTS] 
Fix QueryTest.checkAnswer usage
URL: https://github.com/apache/spark/pull/26768#discussion_r354637971
 
 

 ##########
 File path: 
sql/core/src/test/scala/org/apache/spark/sql/streaming/StreamSuite.scala
 ##########
 @@ -757,7 +757,10 @@ class StreamSuite extends StreamTest {
 
         QueryTest.checkAnswer(spark.table("counts").toDF(),
           Row("1", 1) :: Row("2", 1) :: Row("3", 2) :: Row("4", 2) ::
-          Row("5", 2) :: Row("6", 2) :: Row("7", 1) :: Row("8", 1) :: Row("9", 
1) :: Nil)
+          Row("5", 2) :: Row("6", 2) :: Row("7", 1) :: Row("8", 1) :: Row("9", 
1) :: Nil) match {
+          case Some(errorMessage) => fail(errorMessage)
+          case None =>
+        }
 
 Review comment:
   This is because `expectedAnswer`'s data type do not match. 
https://github.com/apache/spark/pull/26768/commits/61eacc940381ef717f102c809ef80afd9b0facf7
 fix this issue.

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