Hive insert overwrite directory stored as parquet made NULL values - hive

Question

I'm trying to add some data in one directory, and after to add these data as partition to a table.
create table test (key int, value int) partitioned by (dt int) stored as parquet location '/user/me/test';
insert overwrite directory '/user/me/test/dt=1' stored as parquet select 123, 456, 1;
alter table test add partition (dt=1);
select * from test;
This code sample is simple... but don't work. With the select statement, the output is NULL, NULL, 1. But I need 123, 456, 1.
When I read the data with Impala, I received 123, 456, 1... what is expected.
Why ? What is wrong ?
If I removed the two "stored as parquet", it's all ok... but I want my data in parquet !
PS : I want this construct for a switch of partition, so that when the data are calculated, they don't go to the user...

Answer 1

Identifying the issue
hive
create table test (key int, value int)
partitioned by (dt int)
stored as parquet location '/user/me/test'
;
insert overwrite directory '/user/me/test/dt=1'
stored as parquet
select 123, 456
;
alter table test add partition (dt=1)
;
select * from test
;
+----------+------------+---------+
| test.key | test.value | test.dt |
+----------+------------+---------+
| NULL | NULL | 1 |
+----------+------------+---------+
bash
parquet-tools cat hdfs://{fs.defaultFS}/user/me/test/dt=1/000000_0
_col0 = 123
_col1 = 456
Verifying the issue
hive
alter table test change column `key` `_col0` int cascade;
alter table test change column `value` `_col1` int cascade;
select * from test
;
+------------+------------+---------+
| test._col0 | test._col1 | test.dt |
+------------+------------+---------+
| 123 | 456 | 1 |
+------------+------------+---------+
Suggestd Solution
create additional table test_admin and do the insert through it
create table test_admin (key int, value int)
partitioned by (dt int)
stored as parquet location '/user/me/test'
;
create external table test (key int, value int)
partitioned by (dt int)
stored as parquet
location '/user/me/test'
;
insert into test_admin partition (dt=1) select 123, 456
;
select * from test_admin
;
+----------+------------+---------+
| test.key | test.value | test.dt |
+----------+------------+---------+
| 123 | 456 | 1 |
+----------+------------+---------+
select * from test
;
(empty result set)
alter table test add partition (dt=1)
;
select * from test
;
+----------+------------+---------+
| test.key | test.value | test.dt |
+----------+------------+---------+
| 123 | 456 | 1 |
+----------+------------+---------+