cloud-fan commented on a change in pull request #26053: [SPARK-29379][SQL]SHOW 
FUNCTIONS  show '!=', '<>' , 'between', 'case'
URL: https://github.com/apache/spark/pull/26053#discussion_r335327656
 
 

 ##########
 File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/command/functions.scala
 ##########
 @@ -73,6 +73,11 @@ case class CreateFunctionCommand(
       s"is not allowed: '${databaseName.get}'")
   }
 
+  // Redefine a virtual function is not allowed
+  if 
(FunctionsCommand.virtualOperators.contains(functionName.toLowerCase(Locale.ROOT)))
 {
+    throw new AnalysisException(s"It's not allowed to redefine virtual 
function '$functionName'")
 
 Review comment:
   If we can't fix the problem completely here, let's keep it unchanged and fix 
them all together later.

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