Adding tests for the fixed ORDER BY 0 bug

mysql-test/r/derived.result

@@ -146,3 +146,5 @@ SELECT 1 as a FROM (SELECT a UNION SELECT 1) b;
 Unknown column 'a' in 'field list'
 SELECT 1 as a FROM (SELECT 1 UNION SELECT a) b;
 Unknown column 'a' in 'field list'
+select 1 from  (select 2) a order by 0;
+Unknown column '0' in 'order clause'

mysql-test/r/union.result

@@ -267,3 +267,5 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	PRIMARY	t1	const	PRIMARY	PRIMARY	4	const	1	
 2	UNION	t1	ref	b	b	5	const	1	Using where
 drop table t1,t2;
+(select 1) union (select 2) order by 0;
+Unknown column '0' in 'order clause'

mysql-test/t/derived.test

@@ -62,3 +62,5 @@ SELECT * FROM (SELECT 1 UNION SELECT a) b;
 SELECT 1 as a FROM (SELECT a UNION SELECT 1) b;
 --error 1054
 SELECT 1 as a FROM (SELECT 1 UNION SELECT a) b;
+--error 1054
+select 1 from  (select 2) a order by 0;

mysql-test/t/union.test

@@ -142,3 +142,5 @@ explain (select * from t1 where a=1) union (select * from t2 where a=1);
 explain (select * from t1 where a=1 and b=10) union (select t1.a,t2.a from t1,t2 where t1.a=t2.a);
 explain (select * from t1 where a=1) union (select * from t1 where b=1);
 drop table t1,t2;
+--error 1054
+(select 1) union (select 2) order by 0;