andygrove opened a new issue, #463:
URL: https://github.com/apache/datafusion-comet/issues/463
### Describe the bug
repro is to modify this existing test in `CometExpressionSuite` to also test
negative indices:
```scala
test("string type and substring") {
withParquetTable((0 until 5).map(i => (i.toString, (i + 100).toString)),
"tbl") {
checkSparkAnswerAndOperator("SELECT _1, substring(_2, 2, 2) FROM tbl")
checkSparkAnswerAndOperator("SELECT _1, substring(_2, 2, -2) FROM tbl")
checkSparkAnswerAndOperator("SELECT _1, substring(_2, -2, 2) FROM tbl")
checkSparkAnswerAndOperator("SELECT _1, substring(_2, -2, -2) FROM
tbl")
}
}
```
output:
```
== Results ==
!== Correct Answer - 5 == == Spark Answer - 5 ==
struct<_1:string,substring(_2, 2, -2):string>
struct<_1:string,substring(_2, 2, -2):string>
![0,] [0,00]
![1,] [1,01]
![2,] [2,02]
![3,] [3,03]
![4,] [4,04]
```
### Steps to reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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