From 692a44b30928e9bfb8f7a1aaf450fc29fa97c4b8 Mon Sep 17 00:00:00 2001
From: Oleksandr Byelkin <sanja@mariadb.com>
Date: Tue, 20 Oct 2020 12:01:37 +0200
Subject: [PATCH] MDEV-23327: followup
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fix an error with locked taböes
---
 sql/sql_udf.cc | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sql/sql_udf.cc b/sql/sql_udf.cc
index b4e863709d5..2af12d94228 100644
--- a/sql/sql_udf.cc
+++ b/sql/sql_udf.cc
@@ -654,6 +654,12 @@ enum drop_udf_result mysql_drop_function(THD *thd, const LEX_STRING *udf_name)
   udf_func *udf;
   DBUG_ENTER("mysql_drop_function");
 
+  if (thd->locked_tables_mode)
+  {
+    my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
+    DBUG_RETURN(UDF_DEL_RESULT_ERROR);
+  }
+
   if (!(table= open_udf_func_table(thd)))
     DBUG_RETURN(UDF_DEL_RESULT_ERROR);