neilconway opened a new pull request, #22077:
URL: https://github.com/apache/datafusion/pull/22077
## Which issue does this PR close?
- Closes #22076.
## Rationale for this change
`format_string("%c")` in `datafusion-spark` calls `char::from_u32.unwrap()`
without checking for a `None` return, which leads to panicking on invalid
inputs (e.g., negative values and illegal Unicode codepoints).
## What changes are included in this PR?
* Add error handling for `format_string("%c")`
* Rust unit tests
* SLT end-to-end test
## Are these changes tested?
Yes.
## Are there any user-facing changes?
No.
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