Mryange opened a new pull request, #31913:
URL: https://github.com/apache/doris/pull/31913
## Proposed changes
```
mysql [test]>select * from foreach_table;
+------+-----------+-----------------------+-------------------------+
| id | a | b | s |
+------+-----------+-----------------------+-------------------------+
| 1 | [1, 2, 3] | [[1], [1, 2, 3], [2]] | ["ab", "123", "114514"] |
| 2 | [20] | [[2]] | ["cd"] |
| 3 | [100] | [[1]] | ["efg"] |
| 4 | NULL | [null] | NULL |
| 5 | [null, 2] | [[2], null] | [null, "c"] |
+------+-----------+-----------------------+-------------------------+
5 rows in set (0.01 sec)
mysql [test]>select array_agg_foreach(s) from foreach_table;
+-------------------------------------------------------+
| array_agg_foreach(s) |
+-------------------------------------------------------+
| [["ab", "cd", "efg", null], ["123", "c"], ["114514"]] |
+-------------------------------------------------------+
1 row in set (0.02 sec)
mysql [test]>select map_agg_foreach(s,a) from foreach_table;
+----------------------------------------------------------------+
| map_agg_foreach(s, a) |
+----------------------------------------------------------------+
| [{"ab":1, "cd":20, "efg":100}, {"123":2, "c":2}, {"114514":3}] |
+----------------------------------------------------------------+
1 row in set (0.02 sec)
```
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