MDEV-16036: Debug assertion failed in resignal on create temporary table

Reising condition on NOTW controlled by OPTION_SQL_NOTES.

mysql-test/main/sp.result

@@ -8731,3 +8731,38 @@ t1	CREATE TABLE `t1` (
 ) ENGINE=MyISAM DEFAULT CHARSET=latin1
 DROP TABLE t1;
 DROP FUNCTION f1;
+#
+# MDEV-16036: Debug assertion failed in resignal on create
+# temporary table 
+#
+set @save_sql_mode= @@sql_mode;
+set sql_mode='ORACLE';
+CREATE or replace procedure p4()
+AS
+CONTINUE HANDLER FOR SQLWARNING
+BEGIN
+NULL;
+END;
+EXIT HANDLER FOR OTHERS -- SQLEXCEPTION
+BEGIN
+GET DIAGNOSTICS CONDITION 1 @sqlstate = RETURNED_SQLSTATE, @errno = MYSQL_ERRNO, @text = MESSAGE_TEXT;
+SELECT @sqlstate, @errno, @text;
+SHOW WARNINGS;
+RESIGNAL;  -- cause DBG_ASSERT failed
+END;
+BEGIN
+CREATE TEMPORARY TABLE IF NOT EXISTS t1(origine VARCHAR2(10) NOT NULL);
+END
+/
+call p4();
+call p4();
+@sqlstate	@errno	@text
+42S01	1050	Table 't1' already exists
+Level	Code	Message
+Note	1050	Table 't1' already exists
+Warnings:
+Note	1050	Table 't1' already exists
+drop procedure p4;
+drop table t1;
+set @@sql_mode=@save_sql_mode;
+# End of 10.3 tests

mysql-test/main/sp.test

@@ -10252,3 +10252,37 @@ CREATE TABLE t1 AS SELECT f1() AS c1, COALESCE(f1()) AS c2, CONCAT(f1()) AS c3;
 SHOW CREATE TABLE t1;
 DROP TABLE t1;
 DROP FUNCTION f1;
+
+--echo #
+--echo # MDEV-16036: Debug assertion failed in resignal on create
+--echo # temporary table 
+--echo #
+
+set @save_sql_mode= @@sql_mode;
+set sql_mode='ORACLE';
+delimiter /;
+CREATE or replace procedure p4()
+AS
+  CONTINUE HANDLER FOR SQLWARNING
+  BEGIN
+    NULL;
+  END;
+  EXIT HANDLER FOR OTHERS -- SQLEXCEPTION
+  BEGIN
+      GET DIAGNOSTICS CONDITION 1 @sqlstate = RETURNED_SQLSTATE, @errno = MYSQL_ERRNO, @text = MESSAGE_TEXT;
+      SELECT @sqlstate, @errno, @text;
+      SHOW WARNINGS;
+      RESIGNAL;  -- cause DBG_ASSERT failed
+  END;
+BEGIN
+  CREATE TEMPORARY TABLE IF NOT EXISTS t1(origine VARCHAR2(10) NOT NULL);
+END
+/
+delimiter ;/
+call p4();
+call p4();
+drop procedure p4;
+drop table t1;
+set @@sql_mode=@save_sql_mode;
+
+--echo # End of 10.3 tests

sql/sql_signal.cc

@@ -343,13 +343,15 @@ bool Sql_cmd_common_signal::raise_condition(THD *thd, Sql_condition *cond)
   if (eval_signal_informations(thd, cond))
     DBUG_RETURN(result);
 
-  /* SIGNAL should not signal WARN_LEVEL_NOTE */
-  DBUG_ASSERT((cond->m_level == Sql_condition::WARN_LEVEL_WARN) ||
-              (cond->m_level == Sql_condition::WARN_LEVEL_ERROR));
+  /* SIGNAL should not signal WARN_LEVEL_NOTE, but RESIGNAL can */
+  DBUG_ASSERT(cond->m_level == Sql_condition::WARN_LEVEL_ERROR ||
+              cond->m_level != Sql_condition::WARN_LEVEL_NOTE ||
+              sql_command_code() == SQLCOM_RESIGNAL);
 
   (void) thd->raise_condition(cond);
 
-  if (cond->m_level == Sql_condition::WARN_LEVEL_WARN)
+  if (cond->m_level == Sql_condition::WARN_LEVEL_WARN ||
+      cond->m_level == Sql_condition::WARN_LEVEL_NOTE)
   {
     my_ok(thd);
     result= FALSE;