Wrong result for partition table with order by + limit

[Defined2014]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

create table t(a int, b int, index idx_bc(a, b)) PARTITION BY HASH (`b`) PARTITIONS 4;
insert into t values (1,2),(1,3),(1,1),(1,5);
analyze table t;
select * from t where a = 1 order by b limit 10;

2. What did you expect to see? (Required)

mysql> select * from tcommonhash where a = 1 order by b limit 10;
+------+------+
| a    | b    |
+------+------+
|    1 |    1 |
|    1 |    2 |
|    1 |    3 |
|    1 |    5 |
+------+------+
4 rows in set (0.00 sec)

3. What did you see instead (Required)

mysql> select * from tcommonhash where a = 1 order by b limit 10;
+------+------+
| a    | b    |
+------+------+
|    1 |    1 |
|    1 |    3 |
|    1 |    5 |
|    1 |    2 |
+------+------+
4 rows in set (0.00 sec)

4. What is your TiDB version? (Required)

Only on master branch