dongjoon-hyun commented on a change in pull request #27803:
URL: https://github.com/apache/spark/pull/27803#discussion_r416330704



##########
File path: 
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/AnalysisErrorSuite.scala
##########
@@ -425,38 +425,35 @@ class AnalysisErrorSuite extends AnalysisTest {
       TimeWindow(Literal("2016-01-01 01:01:01"), "1 second", "0 second", "0 
second").as("window")),
       "The slide duration" :: " must be greater than 0." :: Nil
   )
-
+"Nested generators are supported only when inner generators " +
+          "are unary and adjacent with single output, but got: "

Review comment:
       Ur, maybe, mistake?




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