Fixed alias.test to also works with ps

The issue is that max_length for prepared statements are different from
normal queries, which can optimize the max_length based on the result
length.

mysql-test/main/alias.result

@@ -223,16 +223,16 @@ disconnect c1;
 #
 create or replace table t1 (a int);
 create or replace table t2 (b int);
-insert into t1 values(1),(2);
+insert into t1 values(1<<30),(1<<29);
 insert into t2 values(1),(2);
 select t1.a as a1 from t1 as t1,t2 order by t2.b,t1.a;
 Catalog	Database	Table	Table_alias	Column	Column_alias	Type	Length	Max length	Is_null	Flags	Decimals	Charsetnr
-def	test	t1	t1	a	a1	3	11	1	Y	32768	0	63
+def	test	t1	t1	a	a1	3	11	10	Y	32768	0	63
 a1
-1
-2
-1
-2
+536870912
+1073741824
+536870912
+1073741824
 drop table t1,t2;
 #
 # End of 10.4 tests

mysql-test/main/alias.test

@@ -231,7 +231,7 @@ disconnect c1;
 --echo #
 create or replace table t1 (a int);
 create or replace table t2 (b int);
-insert into t1 values(1),(2);
+insert into t1 values(1<<30),(1<<29);
 insert into t2 values(1),(2);
 --enable_metadata
 select t1.a as a1 from t1 as t1,t2 order by t2.b,t1.a;