[VL][1.5] Result mismatch of `upper` function
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triage
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- Scala
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Description
### Backend
VL (Velox)
### Bug description
test sql:
```
select url_encode(upper(url_decode('%E1%83%9A')));
```
spark result: `%E1%83%9A`
gluten result: `%E1%B2%9A`
refer: https://en.wikipedia.org/wiki/Lasi_(letter)
### Gluten version
Gluten-1.5
### Spark version
Spark-3.5.x
### Spark configurations
_No response_
### System information
_No response_
### Relevant logs
```bash
```
Contributor guide
Research direction
Start by running the provided SQL query with Gluten 1.5 and Velox, then compare its result with Spark 3.5.x. Investigate the uppercase and URL encode/decode path; done when the Gluten result matches Spark's `%E1%83%9A` output.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- sql
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100