Reminiscent opened a new pull request, #20053:
URL: https://github.com/apache/doris/pull/20053
## Problem summary
We can not use the string as the variable key to use in the hint.
Before this PR
```
mysql> SET enable_nereids_planner=true;
Query OK, 0 rows affected (0.01 sec)
mysql> set enable_fallback_to_original_planner=false;
Query OK, 0 rows affected (0.10 sec)
mysql> explain select /*+ SET_var("enable_nereids_planner" = "false") */ 1;
ERROR 1105 (HY000): Exception, msg: Nereids cannot parse the SQL, and
fallback disabled. caused by:
no viable alternative at input 'select /*+
SET_var("enable_nereids_planner"'(line 1, pos 27)
```
After this PR
```
mysql> SET enable_nereids_planner=true;
Query OK, 0 rows affected (0.01 sec)
mysql> set enable_fallback_to_original_planner=false;
Query OK, 0 rows affected (0.10 sec)
mysql> select /*+ SET_var("enable_nereids_planner" = "false") */ 1;
+------+
| 1 |
+------+
| 1 |
+------+
1 row in set (0.00 sec)
```
Describe your changes.
Support the string for the hint key in the Parser.
## Checklist(Required)
* [ ] Does it affect the original behavior
* [ ] Has unit tests been added
* [ ] Has document been added or modified
* [ ] Does it need to update dependencies
* [ ] Is this PR support rollback (If NO, please explain WHY)
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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