split_part function returning wrong results #20503
Description
Describe the bug
split_part('a,b', '', 2) is returning 'a', but it should return "" (PostgreSQL - https://www.db-fiddle.com/f/bndEpNtUKEnLoe3oQE1gtY/0). It seems to be related to how the split(...) function works in Rust.
Rust playground repro
Another instance of this bug is the following query:
SELECT split_part('a,b', '', 1)
returning "" instead of a,b
To Reproduce
Expected behavior
return ""
Additional context
No response