xil-db commented on code in PR #48127:
URL: https://github.com/apache/spark/pull/48127#discussion_r1763777762


##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/LogicalPlan.scala:
##########
@@ -416,12 +417,22 @@ object LogicalPlanIntegrity {
   }
 
   def validateSchemaOutput(previousPlan: LogicalPlan, currentPlan: 
LogicalPlan): Option[String] = {
-    if (!DataTypeUtils.equalsIgnoreNullability(previousPlan.schema, 
currentPlan.schema)) {
-      Some(s"The plan output schema has changed from 
${previousPlan.schema.sql} to " +
-        currentPlan.schema.sql + s". The previous plan: 
${previousPlan.treeString}\nThe new " +
-        "plan:\n" + currentPlan.treeString)
+    if (SqlApiConf.get.caseSensitiveAnalysis) {
+      if (!DataTypeUtils.equalsIgnoreNullability(previousPlan.schema, 
currentPlan.schema)) {
+        Some(s"The plan output schema has changed from 
${previousPlan.schema.sql} to " +
+          currentPlan.schema.sql + s". The previous plan: 
${previousPlan.treeString}\nThe new " +
+          "plan:\n" + currentPlan.treeString)
+      } else {
+        None
+      }
     } else {
-      None
+      if (!DataTypeUtils.equalsIgnoreCaseAndNullability(previousPlan.schema, 
currentPlan.schema)) {
+        Some(s"The plan output schema has changed from 
${previousPlan.schema.sql} to " +
+          currentPlan.schema.sql + s". The previous plan: 
${previousPlan.treeString}\nThe new " +
+          "plan:\n" + currentPlan.treeString)
+      } else {
+        None
+      }

Review Comment:
   can we avoid duplicating the error messages?
   maybe something like 
   ```
   val isValid = if(SqlApiConf.get.caseSensitiveAnalysis) {...} else {...}
   if (!isValid) { Some(...) }  else { None }
   ```



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