create table t1(a int, b int, x char(32));
insert into t1 values (2, 10, 'xx');
insert into t1 values (2, 10, 'zz');
insert into t1 values (2, 20, 'yy');
insert into t1 values (3, 10, 'xxx');
insert into t1 values (3, 20, 'vvv');
# Uncommenting this line causes a crash in setup_group when executing the second
# select.
#select row_number() over (order by b) from t1;
select a, b, x, row_number() over (partition by a,b order by x),
                row_number() over (partition by a),
                row_number() over (partition by a order by x)

from t1;
# Uncommenting this line causes a crash in filesort during init_for_filesort.
#select a, b, x, row_number() over (partition by a order by x) from t1;

drop table t1;