if partition have the same data location,quey will ignore the former one

Hi 

I have a weird thing,the bevior shows like this:

1) create table test1(id int) partitioned by (year int);

2) insert overwrite table test1 partition(year=2020) select 1;

3) check the location of partition 2020,so as '/A/B';

4) alter table test1 add partition(year=2021) location '/A/B'

5)check the data

6)check partitrions

7)check data from different partitions

8)The question is,when we check the count,the result sames wrong :

hive> select year,count(1) as cnt from test1 group by year;

OK
2021 1
Time taken: 9.524 seconds, Fetched: 1 row(s)
hive>

 

Can anyone help review whether we have fixed this issue in furture?

 

Thansk in advance!