fix: alter table check

tests/script/tsim/parser/alter_column.sim

@@ -55,7 +55,7 @@ sql_error alter table tb modify column c3 nchar(10);
 sql_error alter table tb modify column c3 nchar(0);
 sql_error alter table tb modify column c3 nchar(-1);
 sql_error alter table tb modify column c3 binary(80);
-sql alter table tb modify column c3 nchar(17000);
+sql_error alter table tb modify column c3 nchar(17000);
 sql_error alter table tb modify column c3 nchar(100), c2 binary(30);
 sql_error alter table tb modify column c1 nchar(100), c2 binary(30);
 sql_error alter stable tb modify column c2 binary(30);

tests/script/tsim/parser/alter_stable.sim

@@ -34,7 +34,7 @@ sql alter table tb1 set tag len = 379
 
 # case TD-5594
 sql create stable st5520(ts timestamp, f int) tags(t0 bool, t1 nchar(4093), t2 nchar(1))
-sql alter stable st5520 modify tag t2 nchar(2);
+sql_error alter stable st5520 modify tag t2 nchar(2);
 # test end
 sql drop database $db