toby-bridges opened a new pull request, #22288:
URL: https://github.com/apache/datafusion/pull/22288
## Summary
- remove the `regexp_instr` empty-pattern special case that forced `0`
- rely on the existing regex search path so non-empty strings return
PostgreSQL-compatible 1-based positions for empty patterns
- add scalar regression coverage and a sqllogictest case for `SELECT
regexp_instr('abc', '')`
Fixes #22257.
## Testing
- `cargo test -p datafusion-functions regexp_instr`
- `cargo test -p datafusion-sqllogictest --test sqllogictests --
regexp_instr.slt`
- `cargo fmt --all --check`
- `git diff --check`
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