strongduanmu commented on issue #21417:
URL:
https://github.com/apache/shardingsphere/issues/21417#issuecomment-1272525819
When I execute `SELECT * FROM t_order INTERSECT ALL SELECT * FROM t_order;`,
following result return.
```
sharding_db=> SELECT * FROM t_order INTERSECT ALL SELECT * FROM t_order;
order_id | user_id | status | merchant_id | remark | creation_date
----------+---------+--------+-------------+--------+---------------
(0 rows)
```
But the actual result should be.
```
order_id | user_id | status | merchant_id | remark | creation_date
----------+---------+--------+-------------+--------+---------------
2501 | 25 | init | 4 | test | 2017-08-08
1800 | 18 | init | 13 | test | 2017-08-08
1900 | 19 | init | 17 | test | 2017-08-08
1300 | 13 | init | 13 | test | 2017-08-08
2600 | 26 | init | 7 | test | 2017-08-08
1701 | 17 | init | 10 | test | 2017-08-08
2801 | 28 | init | 16 | test | 2017-08-08
2800 | 28 | init | 15 | test | 2017-08-08
1001 | 10 | init | 2 | test | 2017-08-08
2000 | 20 | init | 3 | test | 2017-08-08
2301 | 23 | init | 16 | test | 2017-08-08
1500 | 15 | init | 1 | test | 2017-08-08
1201 | 12 | init | 10 | test | 2017-08-08
2400 | 24 | init | 19 | test | 2017-08-08
2201 | 22 | init | 12 | test | 2017-08-08
1101 | 11 | init | 6 | test | 2017-08-08
2700 | 27 | init | 11 | test | 2017-08-08
1601 | 16 | init | 6 | test | 2017-08-08
2300 | 23 | init | 15 | test | 2017-08-08
1400 | 14 | init | 17 | test | 2017-08-08
2701 | 27 | init | 12 | test | 2017-08-08
1501 | 15 | init | 2 | test | 2017-08-08
1401 | 14 | init | 18 | test | 2017-08-08
2901 | 29 | init | 20 | test | 2017-08-08
1200 | 12 | init | 9 | test | 2017-08-08
2200 | 22 | init | 11 | test | 2017-08-08
1700 | 17 | init | 9 | test | 2017-08-08
2401 | 24 | init | 20 | test | 2017-08-08
2500 | 25 | init | 3 | test | 2017-08-08
2101 | 21 | init | 8 | test | 2017-08-08
1600 | 16 | init | 5 | test | 2017-08-08
1801 | 18 | init | 14 | test | 2017-08-08
1301 | 13 | init | 14 | test | 2017-08-08
2601 | 26 | init | 8 | test | 2017-08-08
1100 | 11 | init | 5 | test | 2017-08-08
2100 | 21 | init | 7 | test | 2017-08-08
1000 | 10 | init | 1 | test | 2017-08-08
2001 | 20 | init | 4 | test | 2017-08-08
1901 | 19 | init | 18 | test | 2017-08-08
2900 | 29 | init | 19 | test | 2017-08-08
(40 rows)
```
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