fixed printing of stored procedure functions names (BUG#5149)

mysql-test/r/view.result:
  VIEW based on functions with  complex names
mysql-test/t/view.test:
  VIEW based on functions with  complex names
sql/item_func.cc:
  fixed printing of stored procedure functions names

mysql-test/r/view.result

@@ -1166,3 +1166,13 @@ Table	Create Table
 v3	CREATE VIEW `test`.`v3` AS select `v1`.`col1` AS `a`,`v2`.`col1` AS `b` from `test`.`v1` join `test`.`v2` where (`v1`.`col1` = `v2`.`col1`)
 drop view v3, v2, v1;
 drop table t2, t1;
+create function `f``1` () returns int return 5;
+create view v1 as select test.`f``1` ();
+show create view v1;
+Table	Create Table
+v1	CREATE VIEW `test`.`v1` AS select `test`.`f``1`() AS `test.``f````1`` ()`
+select * from v1;
+test.`f``1` ()
+5
+drop view v1;
+drop function `f``1`;

mysql-test/t/view.test

@@ -1106,3 +1106,13 @@ select * from v3;
 show create view v3;
 drop view v3, v2, v1;
 drop table t2, t1;
+
+#
+# VIEW based on functions with  complex names
+#
+create function `f``1` () returns int return 5;
+create view v1 as select test.`f``1` ();
+show create view v1;
+select * from v1;
+drop view v1;
+drop function `f``1`;

sql/item_func.cc

@@ -3270,9 +3270,22 @@ Item_func_sp::Item_func_sp(sp_name *name, List<Item> &list)
 const char *
 Item_func_sp::func_name() const
 {
-  return m_name->m_name.str;
+  THD * thd= current_thd;
+  uint len= ((m_name->m_db.length +
+              m_name->m_name.length)*2 + //characters*quoting
+             2 +                         // ` and `
+             1 +                         // .
+             1);                         // end of string
+  String qname(alloc_root(&thd->mem_root, len), len,
+               system_charset_info);
+  qname.length(0);
+  append_identifier(thd, &qname, m_name->m_db.str, m_name->m_db.length);
+  qname.append('.');
+  append_identifier(thd, &qname, m_name->m_name.str, m_name->m_name.length);
+  return qname.ptr();
 }
 
+
 int
 Item_func_sp::execute(Item **itp)
 {