strongduanmu commented on issue #22170:
URL:
https://github.com/apache/shardingsphere/issues/22170#issuecomment-1319497223
openGuass currently has no documentation on sorting null values, but it is
compatible with PostgreSQL.
```sql
db_0=> SELECT * FROM t_ssdb_tb_1 order by a asc;
id | c_id | a | b
----+------+----+------------
2 | 1 | 20 | test21
2 | 3 | | Test22
(2 rows)
db_0=> SELECT * FROM t_ssdb_tb_1 order by a desc;
id | c_id | a | b
----+------+----+------------
2 | 3 | | Test22
2 | 1 | 20 | test21
(2 rows)
db_0=> SELECT * FROM t_ssdb_tb_1 order by a desc nulls last;
id | c_id | a | b
----+------+----+------------
2 | 1 | 20 | test21
2 | 3 | | Test22
(2 rows)
```
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