HappenLee opened a new pull request, #35152:
URL: https://github.com/apache/doris/pull/35152
## Proposed changes
beforeļ¼
```
mysql [test_query_db]>set parallel_pipeline_task_num = 1;
Query OK, 0 rows affected (0.00 sec)
mysql [test_query_db]>select count(), cast(k12 as int) as t from baseall
group by t limit 1;
+----------+------+
| count(*) | t |
+----------+------+
| 16 | NULL |
+----------+------+
1 row in set (0.01 sec)
mysql [test_query_db]>set parallel_pipeline_task_num = 2;
Query OK, 0 rows affected (0.01 sec)
mysql [test_query_db]>select count(), cast(k12 as int) as t from baseall
group by t limit 1;
+----------+------+
| count(*) | t |
+----------+------+
| 7 | NULL |
+----------+------+
1 row in set (0.01 sec)
```
after:
```
mysql [test_query_db]>set parallel_pipeline_task_num = 2;
Query OK, 0 rows affected (0.01 sec)
mysql [test_query_db]>select count(), cast(k12 as int) as t from baseall
group by t limit 1;
+----------+------+
| count(*) | t |
+----------+------+
| 16 | NULL |
+----------+------+
1 row in set (0.01 sec)
```
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