…51875)

### What problem does this PR solve?
Problem Summary:
before the result is not correctly, as after insert the rows, should
reset all state of nested function.
So the result of the next line will not be affected by the previous one
```
mysql> select id, v1, multi_distinct_group_concat(v2) over() from multi;
+------+------+----------------------------------------+
| id   | v1   | multi_distinct_group_concat(v2) over() |
+------+------+----------------------------------------+
|    3 |    1 | a                                      |
|    1 |    1 | a,a                                    |
|    1 |    1 | a,a,a                                  |
|    2 |    1 | a,a,a,a                                |
+------+------+----------------------------------------+
4 rows in set (0.21 sec)

mysql> select id, v1, multi_distinct_sum(v1) over() from multi;
+------+------+-------------------------------+
| id   | v1   | multi_distinct_sum(v1) over() |
+------+------+-------------------------------+
|    1 |    1 |                             1 |
|    1 |    1 |                             2 |
|    2 |    1 |                             3 |
|    3 |    1 |                             4 |
+------+------+-------------------------------+
4 rows in set (0.06 sec)
```