[GitHub] [spark] beliefer commented on a diff in pull request #40466: [SPARK-42835][SQL][TESTS] Add test cases for `Column.explain`

["beliefer (via GitHub)" <gi...@apache.org>]

beliefer commented on code in PR #40466:
URL: https://github.com/apache/spark/pull/40466#discussion_r1141536788


##########
sql/core/src/test/scala/org/apache/spark/sql/ColumnExpressionSuite.scala:
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@@ -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:
   > Hm, I wouldn't add a bunch of tests though. `expr.sql` isn't actually strictly providing the compatibility in its string representation, and this test case potentially fails often.
   
   In fact, explain not only reactor `expr.sql`, and `expr.toString` too.



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