andygrove opened a new issue, #3919:
URL: https://github.com/apache/datafusion-comet/issues/3919
### Describe the bug
Add these tests to `substring.sql`:
```
query
SELECT substring(s, -2, 3) FROM test_substring
query
SELECT substring(s, -10, 3) FROM test_substring
query
SELECT substring(s, -300, 3) FROM test_substring
```
Example failure:
```
== Results ==
!== Correct Answer - 4 == == Spark Answer - 4 ==
struct<substring(s, -10, 3):string> struct<substring(s, -10, 3):string>
[] []
![] [abc]
[ell] [ell]
[null] [null]
```
### Steps to reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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