felixwluo opened a new pull request, #50149:
URL: https://github.com/apache/doris/pull/50149
### What problem does this PR solve?
Problem Summary:
sql
```
SELECT t1.no
,t1.sub_str
,t1.str
,substring_index(t1.str, t1.sub_str, -1)
,t2.rst2
FROM (
SELECT 1 AS no, 'BBB' AS sub_str,
'AAA_01|BBB_02|CCC_03|DDD_04|EEE_05|FFF_06' AS str UNION ALL
SELECT 2 AS no, 'ccc' AS sub_str,
'zyz_01|zyz_02|CCC_03|qwe_04|qwe_05|qwe_06' AS str UNION ALL
SELECT 3 AS no, 'DDD' AS sub_str,
'AAA_01|BBB_02|CCC_03|DDD_04|EEE_05|FFF_06' AS str UNION ALL
SELECT 4 AS no, 'DDD' AS sub_str,
'sgr_01|wsc_02|CCC_03|DDD_04|rfv_05|rgb_06' AS str UNION ALL
SELECT 5 AS no, 'eee' AS sub_str,
'cdr_01|vfr_02|dfc_03|DDD_04|EEE_05|FFF_06' AS str UNION ALL
SELECT 6 AS no, 'A_01' AS sub_str,
'AAA_01|dsd_02|ert_03|bgt_04|fgh_05|hyb_06' AS str
) t1
LEFT JOIN (
SELECT 1 AS no, 'BBB' AS sub_str,
substring_index('AAA_01|BBB_02|CCC_03|DDD_04|EEE_05|FFF_06', 'BBB', -1) AS rst2
UNION ALL
SELECT 2 AS no, 'ccc' AS sub_str,
substring_index('zyz_01|zyz_02|CCC_03|qwe_04|qwe_05|qwe_06', 'ccc', -1) AS rst2
UNION ALL
SELECT 3 AS no, 'DDD' AS sub_str,
substring_index('AAA_01|BBB_02|CCC_03|DDD_04|EEE_05|FFF_06', 'DDD', -1) AS rst2
UNION ALL
SELECT 4 AS no, 'DDD' AS sub_str,
substring_index('sgr_01|wsc_02|CCC_03|DDD_04|rfv_05|rgb_06', 'DDD', -1) AS rst2
UNION ALL
SELECT 5 AS no, 'eee' AS sub_str,
substring_index('cdr_01|vfr_02|dfc_03|DDD_04|EEE_05|FFF_06', 'eee', -1) AS rst2
UNION ALL
SELECT 6 AS no, 'A_01' AS sub_str,
substring_index('AAA_01|dsd_02|ert_03|bgt_04|fgh_05|hyb_06', 'A_01', -1) AS
rst2
) t2
ON t1.no = t2.no AND t1.sub_str = t2.sub_str
ORDER BY t1.no;
```
previous results for doris:
```
-- master
function except for the first argument, other parameter must be a constant
-- 2.1
+------+---------+-------------------------------------------+-------------------------------------------------+-------------------------------------------+
| no | sub_str | str |
substring_index(`t1`.`str`, `t1`.`sub_str`, -1) | rst2
|
+------+---------+-------------------------------------------+-------------------------------------------------+-------------------------------------------+
| 1 | BBB | AAA_01|BBB_02|CCC_03|DDD_04|EEE_05|FFF_06 |
_02|CCC_03|DDD_04|EEE_05|FFF_06 |
_02|CCC_03|DDD_04|EEE_05|FFF_06 |
| 2 | ccc | zyz_01|zyz_02|CCC_03|qwe_04|qwe_05|qwe_06 |
zyz_01|zyz_02|CCC_03|qwe_04|qwe_05|qwe_06 |
zyz_01|zyz_02|CCC_03|qwe_04|qwe_05|qwe_06 |
| 3 | DDD | AAA_01|BBB_02|CCC_03|DDD_04|EEE_05|FFF_06 |
_02|CCC_03|DDD_04|EEE_05|FFF_06 | _04|EEE_05|FFF_06
|
| 4 | DDD | sgr_01|wsc_02|CCC_03|DDD_04|rfv_05|rgb_06 |
sgr_01|wsc_02|CCC_03|DDD_04|rfv_05|rgb_06 | _04|rfv_05|rgb_06
|
| 5 | eee | cdr_01|vfr_02|dfc_03|DDD_04|EEE_05|FFF_06 |
cdr_01|vfr_02|dfc_03|DDD_04|EEE_05|FFF_06 |
cdr_01|vfr_02|dfc_03|DDD_04|EEE_05|FFF_06 |
| 6 | A_01 | AAA_01|dsd_02|ert_03|bgt_04|fgh_05|hyb_06 |
AAA_01|dsd_02|ert_03|bgt_04|fgh_05|hyb_06 |
|dsd_02|ert_03|bgt_04|fgh_05|hyb_06 |
+------+---------+-------------------------------------------+-------------------------------------------------+-------------------------------------------+
```
mysql result:
```
+----+---------+-------------------------------------------+-------------------------------------------+-------------------------------------------+
| no | sub_str | str |
substring_index(t1.str, t1.sub_str, -1) | rst2
|
+----+---------+-------------------------------------------+-------------------------------------------+-------------------------------------------+
| 1 | BBB | AAA_01|BBB_02|CCC_03|DDD_04|EEE_05|FFF_06 |
_02|CCC_03|DDD_04|EEE_05|FFF_06 | _02|CCC_03|DDD_04|EEE_05|FFF_06
|
| 2 | ccc | zyz_01|zyz_02|CCC_03|qwe_04|qwe_05|qwe_06 |
zyz_01|zyz_02|CCC_03|qwe_04|qwe_05|qwe_06 |
zyz_01|zyz_02|CCC_03|qwe_04|qwe_05|qwe_06 |
| 3 | DDD | AAA_01|BBB_02|CCC_03|DDD_04|EEE_05|FFF_06 |
_04|EEE_05|FFF_06 | _04|EEE_05|FFF_06
|
| 4 | DDD | sgr_01|wsc_02|CCC_03|DDD_04|rfv_05|rgb_06 |
_04|rfv_05|rgb_06 | _04|rfv_05|rgb_06
|
| 5 | eee | cdr_01|vfr_02|dfc_03|DDD_04|EEE_05|FFF_06 |
cdr_01|vfr_02|dfc_03|DDD_04|EEE_05|FFF_06 |
cdr_01|vfr_02|dfc_03|DDD_04|EEE_05|FFF_06 |
| 6 | A_01 | AAA_01|dsd_02|ert_03|bgt_04|fgh_05|hyb_06 |
|dsd_02|ert_03|bgt_04|fgh_05|hyb_06 | |dsd_02|ert_03|bgt_04|fgh_05|hyb_06
|
+----+---------+-------------------------------------------+-------------------------------------------+-------------------------------------------+
```
current doris results:
```
+------+---------+-------------------------------------------+-------------------------------------------+-------------------------------------------+
| no | sub_str | str |
substring_index(t1.str, t1.sub_str, -1) | rst2
|
+------+---------+-------------------------------------------+-------------------------------------------+-------------------------------------------+
| 1 | BBB | AAA_01|BBB_02|CCC_03|DDD_04|EEE_05|FFF_06 |
_02|CCC_03|DDD_04|EEE_05|FFF_06 | _02|CCC_03|DDD_04|EEE_05|FFF_06
|
| 2 | ccc | zyz_01|zyz_02|CCC_03|qwe_04|qwe_05|qwe_06 |
zyz_01|zyz_02|CCC_03|qwe_04|qwe_05|qwe_06 |
zyz_01|zyz_02|CCC_03|qwe_04|qwe_05|qwe_06 |
| 3 | DDD | AAA_01|BBB_02|CCC_03|DDD_04|EEE_05|FFF_06 |
_04|EEE_05|FFF_06 | _04|EEE_05|FFF_06
|
| 4 | DDD | sgr_01|wsc_02|CCC_03|DDD_04|rfv_05|rgb_06 |
_04|rfv_05|rgb_06 | _04|rfv_05|rgb_06
|
| 5 | eee | cdr_01|vfr_02|dfc_03|DDD_04|EEE_05|FFF_06 |
cdr_01|vfr_02|dfc_03|DDD_04|EEE_05|FFF_06 |
cdr_01|vfr_02|dfc_03|DDD_04|EEE_05|FFF_06 |
| 6 | A_01 | AAA_01|dsd_02|ert_03|bgt_04|fgh_05|hyb_06 |
|dsd_02|ert_03|bgt_04|fgh_05|hyb_06 | |dsd_02|ert_03|bgt_04|fgh_05|hyb_06
|
+------+---------+-------------------------------------------+-------------------------------------------+-------------------------------------------+
```
now consistent with mysql behavior.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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