amaliujia commented on code in PR #40466:
URL: https://github.com/apache/spark/pull/40466#discussion_r1142414407


##########
sql/core/src/test/scala/org/apache/spark/sql/ColumnExpressionSuite.scala:
##########
@@ -921,6 +922,132 @@ class ColumnExpressionSuite extends QueryTest with 
SharedSparkSession {
     }
   }
 
+  private def captureStdOut(block: => Unit): String = {
+    val capturedOut = new ByteArrayOutputStream()
+    Console.withOut(capturedOut)(block)
+    capturedOut.toString()
+  }
+
+  test("explain") {

Review Comment:
   +1 if we still want be aware it's changing, golden files is a better way.



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