MDEV-35090 (Item_func_current_user) Assertion `typeid(*copy) == typeid(*this)' failed in Item_func_or_sum::do_build_clone

Added missing do_get_copy of Item_func_current_user.

Author: sanja-byelkin

mysql-test/main/view.result

@@ -6990,4 +6990,15 @@ View	Create View	character_set_client	collation_connection
 v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select 1 AS `1` from `t1` union (select 1 AS `1` from DUAL  where 1 group by 1 having 1 for update)	latin1	latin1_swedish_ci
 DROP VIEW v1;
 DROP TABLE t1;
+#
+# MDEV-35090: (Item_func_current_user) Assertion
+# `typeid(*copy) == typeid(*this)' failed in
+# Item_func_or_sum::do_build_clone
+#
+CREATE VIEW v AS SELECT 1;
+SELECT * FROM v WHERE UpdateXML('<user>N/A</user>','/a',CURRENT_USER());
+1
+Warnings:
+Warning	1292	Truncated incorrect INTEGER value: '<user>N/A</user>'
+DROP VIEW v;
 # End of 10.5 tests

mysql-test/main/view.test

@@ -6755,4 +6755,17 @@ SHOW CREATE VIEW v1;
 DROP VIEW v1;
 DROP TABLE t1;
 
+--echo #
+--echo # MDEV-35090: (Item_func_current_user) Assertion
+--echo # `typeid(*copy) == typeid(*this)' failed in
+--echo # Item_func_or_sum::do_build_clone
+--echo #
+
+CREATE VIEW v AS SELECT 1;
+
+SELECT * FROM v WHERE UpdateXML('<user>N/A</user>','/a',CURRENT_USER());
+
+# Cleanup
+DROP VIEW v;
+
 --echo # End of 10.5 tests

sql/item_strfunc.h

@@ -1029,6 +1029,8 @@ class Item_func_current_user :public Item_func_user
     return mark_unsupported_function(fully_qualified_func_name(), arg,
                                      VCOL_SESSION_FUNC);
   }
+  Item *do_get_copy(THD *thd) const override
+  { return get_item_copy<Item_func_current_user>(thd, this); }
 };