andygrove opened a new issue, #3344:
URL: https://github.com/apache/datafusion-comet/issues/3344
## Description
Comet's native `replace()` function returns incorrect results when the
search string is empty.
Spark behavior: `replace('hello', '', 'x')` returns `xhxexlxlxox` (inserts
replacement between every character and at boundaries).
Comet behavior: returns `hello` (no replacement).
## How to Reproduce
```sql
SELECT replace('hello', '', 'x');
```
Expected: `xhxexlxlxox`
Actual (Comet): `hello`
## Expected Behavior
Comet should match Spark's semantics for empty-string search in `replace()`.
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