branch-2.1: [Bug](sort) fix wrong result coz push down sort with null last #51472 #51507
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Thank you for your contribution to Apache Doris. Please clearly describe your PR:
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### What problem does this PR solve?
```sql
drop table if exists d_table;
create table d_table (
k1 int null,
k2 int not null,
k3 bigint null,
k4 varchar(100) null
)
duplicate key (k1,k2,k3)
distributed BY hash(k1) buckets 3
properties("replication_num" = "1");
insert into d_table select 1,1,1,'a';
insert into d_table select 2,2,2,'b';
insert into d_table select 3,-3,null,'c';
insert into d_table select 3,3,null,'c';
insert into d_table select null,3,null,'c';
select * from d_table order by k1 nulls last limit 1;
mysql> select * from d_table order by k1 nulls last limit 1;
+------+------+------+------+
| k1 | k2 | k3 | k4 |
+------+------+------+------+
| 2 | 2 | 2 | b |
+------+------+------+------+
1 row in set (0.01 sec)
mysql> select * from d_table order by k1 nulls last limit 2;
+------+------+------+------+
| k1 | k2 | k3 | k4 |
+------+------+------+------+
| 1 | 1 | 1 | a |
| 2 | 2 | 2 | b |
+------+------+------+------+
2 rows in set (0.02 sec)
```
yiguolei
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yiguolei
approved these changes
Jun 16, 2025
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Cherry-picked from #51472