This commit adds the same call of st_select_lex::set_unique_exclude() that

complemented the fix for MDEV-24823 in 10.2. As it is the only call of
this function in 10.3 the commit also has added the code of the function.

sql/sql_delete.cc

@@ -1013,7 +1013,7 @@ int mysql_multi_delete_prepare(THD *thd)
     Multi-delete can't be constructed over-union => we always have
     single SELECT on top and have to check underlying SELECTs of it
   */
-  lex->select_lex.exclude_from_table_unique_test= TRUE;
+  lex->select_lex.set_unique_exclude();
   /* Fix tables-to-be-deleted-from list to point at opened tables */
   for (target_tbl= (TABLE_LIST*) aux_tables;
        target_tbl;

sql/sql_lex.cc

@@ -4927,6 +4927,27 @@ bool st_select_lex::save_prep_leaf_tables(THD *thd)
 }
 
 
+/**
+  Set exclude_from_table_unique_test for selects of this select and all selects
+  belonging to the underlying units of derived tables or views
+*/
+
+void st_select_lex::set_unique_exclude()
+{
+  exclude_from_table_unique_test= TRUE;
+  for (SELECT_LEX_UNIT *unit= first_inner_unit();
+       unit;
+       unit= unit->next_unit())
+  {
+    if (unit->derived && unit->derived->is_view_or_derived())
+    {
+      for (SELECT_LEX *sl= unit->first_select(); sl; sl= sl->next_select())
+        sl->set_unique_exclude();
+    }
+  }
+}
+
+
 /*
   Return true if this select_lex has been converted into a semi-join nest
   within 'ancestor'.

sql/sql_lex.h

@@ -1354,6 +1354,8 @@ class st_select_lex: public st_select_lex_node
   bool save_leaf_tables(THD *thd);
   bool save_prep_leaf_tables(THD *thd);
 
+  void set_unique_exclude();
+
   bool is_merged_child_of(st_select_lex *ancestor);
 
   /*