Bug#13344643:Format function in view looses locale information

Problem description:
When a view is created using function FORMAT and if FORMAT function uses locale
option,definition of view saved into server doesn't contain that locale information,
Ex:
create  table test2 (bb decimal (10,2));
insert into test2 values (10.32),(10009.2),(12345678.21);
create view test3 as select format(bb,1,'sk_SK') as cc from test2;
select * from test3;
+--------------+
| cc           |
+--------------+
| 10.3         |
| 10,009.2     |
| 12,345,678.2 |
+--------------+
3 rows in set (0.02 sec)

show create view test3
                View: test3
         Create View: CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost`
SQL SECURITY DEFINER VIEW `test3` AS select format(`test2`.`bb`,1) AS `cc`
from `test2`
character_set_client: latin1
collation_connection: latin1_swedish_ci
1 row in set (0.02 sec)

Problem Analysis:
The function Item_func_format::print() which prints the query string to create
the view does not print the third argument (i.e the locale information). Hence
 view is created without locale information. 

Problem Solution:
If argument count is more than 2 we now print the third argument onto the query string.

Files changed:
sql/item_strfunc.cc
Function call changes: Item_func_format::print()
mysql-test/t/select.test
Added test case to test the bug
mysql-test/r/select.result
Result of the test case appended here

mysql-test/r/select.result

@@ -4970,3 +4970,21 @@ avg(distinct(t1.a))
 0
 DROP TABLE t1;
 # End of test BUG#57203
+#
+# Bug#63020: Function "format"'s 'locale' argument is not considered
+#	     when creating a "view'
+#
+CREATE TABLE t1 (f1 DECIMAL(10,2));
+INSERT INTO t1 VALUES (11.67),(17865.3),(12345678.92);
+CREATE VIEW view_t1 AS SELECT FORMAT(f1,1,'sk_SK') AS f1 FROM t1;
+SHOW CREATE VIEW view_t1;
+View	Create View	character_set_client	collation_connection
+view_t1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `view_t1` AS select format(`t1`.`f1`,1,'sk_SK') AS `f1` from `t1`	latin1	latin1_swedish_ci
+SELECT * FROM view_t1;
+f1
+11,7
+17 865,3
+12 345 678,9
+DROP TABLE t1;
+DROP VIEW view_t1;
+# End of test  BUG#63020

mysql-test/t/select.test

@@ -4236,3 +4236,20 @@ GROUP BY t2.a ORDER BY t1.a;
 DROP TABLE t1;
 
 --echo # End of test BUG#57203
+
+--echo #
+--echo # Bug#63020: Function "format"'s 'locale' argument is not considered
+--echo #	     when creating a "view'
+--echo #
+
+CREATE TABLE t1 (f1 DECIMAL(10,2));
+INSERT INTO t1 VALUES (11.67),(17865.3),(12345678.92);
+CREATE VIEW view_t1 AS SELECT FORMAT(f1,1,'sk_SK') AS f1 FROM t1;
+SHOW CREATE VIEW view_t1;
+SELECT * FROM view_t1;
+
+DROP TABLE t1;
+DROP VIEW view_t1;
+
+--echo # End of test  BUG#63020
+

sql/item_strfunc.cc

@@ -2385,6 +2385,11 @@ void Item_func_format::print(String *str, enum_query_type query_type)
   args[0]->print(str, query_type);
   str->append(',');
   args[1]->print(str, query_type);
+  if(arg_count > 2)
+  {
+    str->append(',');
+    args[2]->print(str,query_type);
+  }
   str->append(')');
 }