gferrate opened a new pull request, #20542:
URL: https://github.com/apache/datafusion/pull/20542
## Which issue does this PR close?
- Closes #20503
## Rationale for this change
`split_part` did not handle empty delimiters in a PostgreSQL-compatible way
(`split("")` in Rust creates leading/trailing empty fields).
This could return unexpected results for positions like `1` / `-1` and
out-of-range values.
This PR aligns behavior with Postgres semantics for empty delimiters.
## What changes are included in this PR?
Small change in how we treat the 1, -1
## Are these changes tested?
Indeed!
## Are there any user-facing changes?
Yes, behavior is now more consistent with PostgreSQL for `split_part(str,
'', n)`.
No API changes.
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