10.2.2 windowing function returns incorrect result

MariaDB [dw]> select count(distinct s) from (select sum(d) over(partition by a,b,c) as s from t) Z where s > 0;

+-------------------+

| count(distinct s) |

+-------------------+

| 1000 |

+-------------------+

1 row in set (0.28 sec)

MariaDB [dw]> select count(distinct s) from (select sum(d) as s from t group by a,b,c) Z where s > 0;

+-------------------+

| count(distinct s) |

+-------------------+

| 2120 |

+-------------------+

1 row in set (0.29 sec)

MariaDB [dw]>

MariaDB [dw]> select count(distinct s) from (select sum(d) over(partition by a,b) as s from t) Z where s > 0;

+-------------------+

| count(distinct s) |

+-------------------+

| 630 |

+-------------------+

1 row in set (0.23 sec)

MariaDB [dw]> select count(distinct s) from (select sum(d) as s from t group by a,b) Z where s > 0;

+-------------------+

| count(distinct s) |

+-------------------+

| 976 |

+-------------------+

1 row in set (0.11 sec)

MariaDB [dw]>

MariaDB [dw]> select count(distinct s) from (select sum(d) over(partition by a) as s from t) Z where s > 0;

+-------------------+

| count(distinct s) |

+-------------------+

| 0 |

+-------------------+

1 row in set (0.15 sec)

MariaDB [dw]> select count(distinct s) from (select sum(d) as s from t group by a) Z where s > 0;

+-------------------+

| count(distinct s) |

+-------------------+

| 1 |

+-------------------+

1 row in set (0.08 sec)

drop table if exists t;

create table t(a int,b int, c int , d int);

insert into t(a,b,c,d) values(1, rand()*1000, rand()*1000, rand()*1000);

insert into t(a,b,c,d) values(1, rand()*1000, rand()*1000, rand()*1000);

replace into t(a,b,c,d) select 1, rand()*1000, rand()*1000, rand()*1000 from t t1, t t2, t t3, t t4, t t5, t t6, t t7, t t8, t t9, t t10, t t11, t t12, t t13, t t14, t t15, t t16, t t17;

select count(distinct s) from (select sum(d) over(partition by a,b,c) as s from t) Z where s > 0;

select count(distinct s) from (select sum(d) as s from t group by a,b,c) Z where s > 0;

select count(distinct s) from (select sum(d) over(partition by a,b) as s from t) Z where s > 0;

select count(distinct s) from (select sum(d) as s from t group by a,b) Z where s > 0;

select count(distinct s) from (select sum(d) over(partition by a) as s from t) Z where s > 0;

select count(distinct s) from (select sum(d) as s from t group by a) Z where s > 0;