Yulei-Yang opened a new pull request, #15024:
URL: https://github.com/apache/doris/pull/15024
add new function substring_index, behavior same as the same name function in
mysql.
mysql> SELECT SUBSTRING_INDEX('www.mysql.com', '.', 2);
+------------------------------------------+
| substring_index('www.mysql.com', '.', 2) |
+------------------------------------------+
| www.mysql |
+------------------------------------------+
mysql> SELECT SUBSTRING_INDEX('www.mysql.com', '.', -2);
+-------------------------------------------+
| substring_index('www.mysql.com', '.', -2) |
+-------------------------------------------+
| mysql.com |
+-------------------------------------------+
mysql> select substring_index("2019年9月8日","月",1);
+----------------------------------------------+
| substring_index('2019年9月8日', '月', 1) |
+----------------------------------------------+
| 2019年9 |
+----------------------------------------------+
mysql> select substring_index("2019年9月8日","月",-1);
+-----------------------------------------------+
| substring_index('2019年9月8日', '月', -1) |
+-----------------------------------------------+
| 8日 |
+-----------------------------------------------+
# Proposed changes
Issue Number: close #13666
## Problem summary
Describe your changes.
## Checklist(Required)
1. Does it affect the original behavior:
- [ ] Yes
- [x] No
- [ ] I don't know
2. Has unit tests been added:
- [ ] Yes
- [x] No
- [ ] No Need
3. Has document been added or modified:
- [x] Yes
- [ ] No
- [ ] No Need
4. Does it need to update dependencies:
- [ ] Yes
- [x] No
5. Are there any changes that cannot be rolled back:
- [ ] Yes (If Yes, please explain WHY)
- [x] 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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