Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/12975#discussion_r62449710 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/command/functions.scala --- @@ -157,6 +157,9 @@ case class DropFunction( throw new AnalysisException(s"Specifying a database in DROP TEMPORARY FUNCTION " + s"is not allowed: '${databaseName.get}'") } + if (FunctionRegistry.builtin.functionExists(functionName)) { --- End diff -- what if users overwrite a built-in function and drop it?
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