eldenmoon opened a new pull request, #13612:
URL: https://github.com/apache/doris/pull/13612

   Returns array sub item indexes eg. [1, 2, 3, …, length (arr) ]
   
   ```
   mysql> create table array_type_table(k1 INT, k2 Array<STRING>) duplicate key 
(k1)
       -> distributed by hash(k1) buckets 1 properties('replication_num' = '1');
   mysql> insert into array_type_table values (0, []), ("1", [NULL]), ("2", 
["1", "2", "3"]), ("3", ["1", NULL, "3"]), ("4", NULL);
   mysql> set enable_vectorized_engine = true;    # enable vectorized engine
   mysql> select k2, array_enumerate(k2) from array_type_table;
   +------------------+-----------------------+
   | k2               | array_enumerate(`k2`) |
   +------------------+-----------------------+
   | []               | []                    |
   | [NULL]           | [1]                   |
   | ['1', '2', '3']  | [1, 2, 3]             |
   | ['1', NULL, '3'] | [1, 2, 3]             |
   | NULL             | NULL                  |
   +------------------+-----------------------+
   5 rows in set (0.01 sec)
   ```
   
   # Proposed changes
   
   Issue Number: close #xxx
   
   ## Problem summary
   
   Describe your changes.
   
   ## Checklist(Required)
   
   1. Does it affect the original behavior: 
       - [ ] Yes
       - [ ] No
       - [ ] I don't know
   2. Has unit tests been added:
       - [ ] Yes
       - [ ] No
       - [ ] No Need
   3. Has document been added or modified:
       - [ ] Yes
       - [ ] No
       - [ ] No Need
   4. Does it need to update dependencies:
       - [ ] Yes
       - [ ] No
   5. Are there any changes that cannot be rolled back:
       - [ ] Yes (If Yes, please explain WHY)
       - [ ] No
   
   ## Further comments
   
   If this is a relatively large or complex change, kick off the discussion at 
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you 
chose the solution you did and what alternatives you considered, etc...
   
   


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